Consulta: creatorFacets:"Cuzon, Gerard"
Registros recuperados: 28
Data/hora: 11/06/2024 06:20:45

A Red Shrimp, Farfantepenaeus brasiliensis (Latreille, 1817), Larvae Feeding Regime Based on Live Food
Provedor de dados: 5
Autores: Gaxiola, Gabriela; Gallardo, Pedro; Simoes, Nuno; Cuzon, Gerard.
Red shrimp, Farfantepenaeus brasiliensis, larvae's response to different concentrations of live foods (diatoms Chaetoceros gracilis: 20-100 x 103 cells/mL; flagellate Tetraselmis chuii: 2-10 x 103 cells/mL and Artemia nauplii [NA]: 1-5 NA/mL) was investigated in three experiments. Experimental assessments were based on four variables: survival rate, weight gain, development index (DI), and resistance to salinity stress. A combination of C. gracilis 80 x 103 cells/mL, T. chuii 2 x 103 cells/mL, and Artemia 4 NA/mL provided the best experimental response. Specifically, F. brasiliensis larvae fed with the above-mentioned optimal concentrations of microalgae and Artemia grew faster and reached the postlarval stage in less time (168 h) than larvae in other...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00028/13928/11639.pdf

Effect of type of binder on growth, digestibility, and energetic balance of Octopus maya
Provedor de dados: 5
Autores: Rosas, C; Tut, J; Baeza, J; Sanchez, A; Sosa, V; Pascual, C; Arena, L; Domingues, P; Cuzon, Gerard.
The present study was designed to test the effects of type of binder on growth, nutritional physiology, total apparent digestibility, and some elements of the energetic balance of early O. maya juveniles. Two experiments were performed. One was aimed at evaluating the effect of type of binder on growth, nutritional physiology, and energetic balance and the other at knowing the effect of the binder on total apparent digestibility of O. maya. Binder type affected growth and survival of early O. maya juveniles. Octopuses fed alginate-bound crab meat lost weight and died, revealing that this type of binder limits nutrient absorption from the diet. In contrast, when gelatin was used as binder, energetic balance was similar to that obtained in animals fed...
Tipo: Text
Palavras-chave: Growth rate; Energetic balance; Diet binder; Digestibility; Octopus maya.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3949.pdf

Substitution of fish meal with plant protein sources and energy budget for white shrimp Litopenaeus vannamei (Boone, 1931)
Provedor de dados: 5
Autores: Suarez, J. A.; Gaxiola, G.; Mendoza, R.; Cadavid, S.; Garcia, G.; Alanis, G.; Suarez, A.; Faillace, J.; Cuzon, Gerard.
Fish meal (FM) has long been considered an essential ingredient for the formulation of shrimp feeds. Until recently, 12%FM was considered a minimum amount, below which weight gain would become reduced due to a reduction in feed intake. In order to test this perceived minimum value, an experiment was conducted on a long-term basis with 4 replicates. Four practical isonitrogenous and isoenergetic diets were formulated for Litopenaeus vannamei juveniles. Survival, weight gain, feed conversion ratio (FCR) and protein efficiency ratio were determined for 0, 6, 10 and 15% FM diets and a reference diet. Shrimp survival ranged from 84 to 86.5%. Shrimp fed a diet with 0% FM showed lower average weight and SGR compared to the other treatments (P&lt;0.05). FCR of...
Tipo: Text
Palavras-chave: Metabolism; Growth; Plant proteins; Substitution fish meal; L. vannamei.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6630.pdf

Glutamate dehydrogenase and Na+-K+ ATPase expression and growth response of Litopenaeus vannamei to different salinities and dietary protein levels
Provedor de dados: 5
Autores: Li, Erchao; Arena, Leticia; Lizama, Gabriel; Gaxiola, Gabriela; Cuzon, Gerard; Rosas, Carlos; Chen, Liqiao; Van Wormhoudt, Alain.
Improvement in the osmoregulation capacity via nutritional supplies is vitally important in shrimp aquaculture. The effects of dietary protein levels on the osmoregulation capacity of the Pacific white shrimp (L. vannamei) were investigated. This involved an examination of growth performance, glutamate dehydrogenase (GDH) and Na+-K+ ATPase mRNA expression,, and GDH activity in muscles and gills. Three experimental diets were formulated, containing 25%, 40%, and 50% dietary protein, and fed to the shrimp at a salinity of 25. After 20 days, no significant difference was observed in weight gain, though GDH and Na+-K+ ATPase gene expression and GDH activity increased with higher dietary protein levels. Subsequently, shrimp fed diets with 25% and 50% dietary...
Tipo: Text
Palavras-chave: Litopenaeus vannamei; Gene expression; Glutamate dehydrogenase; Na+-K+ ATPase; Protein; Salinity.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00031/14261/11692.pdf

Immunoreactive human growth hormone like peptides in tropical Penaeids and the effect of dietary hGH on Penaeus vannamei larval development
Provedor de dados: 5
Autores: Toullec, J. Y.; Le Moullac, Gilles; Cuzon, Gerard; Van Wormhoudt, A.
Human growth hormone like peptides were present in Penaeus indicus as two molecular forms: one with a molecular weight about 25 kDa which is similar to that of the vertebrate growth hormone and a smaller form of 2 kDa. Quantitative variations of hGH-like peptides in different larval stages of three species of Penaeids (Penaeus vannamei, P. stylirostris, P. indicus) suggest a possible involvement of hGH-like peptides in the development. Human growth hormone (hGH) supplementation in the diet of Penaeus vannamei larvae seems to have a positive effect on the size and on the quality of the animals estimated by their resistance to salinity stress.
Tipo: Text
Palavras-chave: Growth hormone; Growth; P. indicus; P. stylirostris; P. vannamei; Penaeids; Hormone de croissance; Croissance; P. indicus; P. stylirostris; P. vannamei; Pénéides.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/publication-4429.pdf

Energy balance of Litopenaeus vannamei postlarvae fed on animal or vegetable protein based compounded feeds
Provedor de dados: 5
Autores: Jimenez Yan, L; Brito, A; Cuzon, Gerard; Gaxiola, G; Garcia, T; Taboada, G; Soto, L; Brito, R.
L. vannamei postlarvae are normally raised with a protein dense diet (50% protein) rich in fishmeal. Part of the protein is utilized for energy purpose instead of protein synthesis. Based on a previous energy partitioning study, the effects of two isoenergetic compounded feed treatments - animal protein (AP) and vegetable protein and carbohydrates (VPC) - upon growth efficiency and energy budget of shrimp postlarvae and early juveniles were determined. Recovered energy (RE) or production (P) after 50 days trial was similar (2 J day(-1)) in both treatments, from PL14 to PL19. However, early juveniles discriminated between animal protein (116 J day(-1)) and vegetable protein and carbohydrates (88 J day(-1)). The difference in respiration indicated a higher...
Tipo: Text
Palavras-chave: Shrimp; Physiology; Vegetable protein; Animal protein; Energy; Juvenile; Postlarvae.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1879.pdf

Replacement of Artemia franciscana Nauplii by Microencapsulated Diets: Effect on Development, Digestive Enzymes, and Body Composition of White Shrimp, Litopenaeus vannamei, Larvae
Provedor de dados: 5
Autores: Gallardo, Pedro; Martinez, Gemma; Palomino, Gabriela; Paredes, Adriana; Gaxiola, Gabriela; Cuzon, Gerard; Pedroza-islas, Ruth.
The effects of two microencapsulated feeds were evaluated on development, growth, survival, proteolytic activity, and biochemical composition of white shrimp, Litopenaeus vannamei, larvae. The treatments were: (1) basal microcapsules (BM), (2) microcapsules containing krill hydrolysate (BMK), and (3) live food control (LFC: Artemia franciscana nauplii) with all treatments receiving algae (Chaetoceros ceratosporum and Tetraselmis chuii). No significant differences were found in development index and survival among larvae. Growth rate was significantly higher in larvae fed LFC (15 +/- 0.06%/d) as compared with those offered the BM diet (7.5 +/- 0.5%/d) with the BMK (11 +/- 0.04%/d) treatment producing intermediate results. The activity of total proteases and...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00136/24774/26979.pdf

Physiological and biochemical changes of wild and cultivated juvenile pink shrimp Farfantepenaeus duorarum (crustacea: penaeidae) during molt cycle
Provedor de dados: 5
Autores: Luis Bonilla-gomez, Jose; Chiappa-carrara, Xavier; Galindo, Carmen; Jeronimo, Gilberto; Cuzon, Gerard; Gaxiola, Gabriela.
Changes in metabolite levels in hemolymph and hepatopancreas were used as indicators of physiological status of juvenile wild and cultivated Farfantepenaeas. duorarum (Burkenroad, 1939), during hyper-osmoregulatory conditions (salinity 22 ppt, 726 mOsm/kg). We analyzed the relationship between biochemical changes of wild and cultivated shrimp at different molt stages by measurement of osmotic capacity, hemocyanin, acylglycerides, cholesterol, glucose, glycogen and total protein. Biochemical analyses of hemolymph (blood) and hepatopancreas showed a decreasing trend in stages closer to molt and an increasing trend before intermolt. Osmotic capacity and blood proteins indicated a significant effect of the molt stage. Stages A. D1' and D''' showed the greatest...
Tipo: Text
Palavras-chave: Biochemical analysis; F. duorarum; Molt stages; Osmoregulation.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00088/19936/17773.pdf

Reproductive performance, biochemical composition and fatty acid profile of wild-caught and 2nd generation domesticated Farfantepenaeus duorarum (Burkenroad, 1939) broodstock
Provedor de dados: 5
Autores: Emerenciano, Mauricio; Cuzon, Gerard; Mascaro, Maite; Arevalo, Miguel; Norena-barroso, Elsa; Jeronimo, Gilberto; Racotta, Ilie; Gaxiola, Gabriela.
A 30-day trial was performed to evaluate the reproductive performance of wild and 2nd generation domesticated Farfantepenaeus duorarum broodstock. Changes in biochemical composition and fatty acids (FA) profile in the 1st and 4th spawn order females were used as indicators of nutritional condition. Wild population of F. duorarum presented significantly better reproductive outcomes as compared to domesticated ones. Wild spawners achieved significantly higher number of eggs per spawn, number of egg per spawn per g of spawner's body weight and number of nauplii per spawn (P&lt;0.05). Latency period was significantly shorter (P&lt;0.05) for wild than for domesticated females (11 vs 17 days). Wild spawners also presented less mortality (6 vs 12%), higher number...
Tipo: Text
Palavras-chave: Fatty acids; F. duorarum; Lipids; Pink shrimp; Nutrition; Reproduction.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00079/19042/17214.pdf

Testing Protein Digestibility in Red Grouper Epinephelus Morio using In Vitro and In Vivo Methods
Provedor de dados: 5
Autores: Silva, A. F.; Escalante, Karla; Alvarez-gonzalez, C. A.; Guerrero-olazaran, M.; Cuzon, Gerard; Gaxiola, Gabriela.
The digestibility of pre-selected ingredients was evaluated for Epinephelus morio using pH-stat and multi-enzyme extract (stomach, intestine, and ceca). The degree of hydrolysis (DH) was tested with acid and alkaline proteases using crustacean meals, squid meal, fish protein concentrate (FPC), fish meal, dried whey, as well as canola paste (w/or w/o phytase), soybean meal (w/or w/o phytase), soyprotein concentrate (SPC), and wheat gluten. SPC produced DH values between 3.6-4.1%, obtained from the three different parts of the digestive tract. Canola paste produced high DH in the stomach by adding phytase to 0.8 and 2% feed. This process was repeated under alkaline conditions for DH, with 0.6-2.6% in the pyloric ceca, and 1-2.2% in the intestine. The DH from...
Tipo: Text
Palavras-chave: ADC; In vitro digestibility; Enzymes; Fish; Feedstuffs.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00248/35930/80189.pdf

The effects of fish hydrolysate (CPSP) level on Octopus maya (Voss and Solis) diet: Digestive enzyme activity, blood metabolites, and energy balance
Provedor de dados: 5
Autores: Aguila, J; Cuzon, Gerard; Pascual, C; Domingues, P; Gaxiola, G; Sanchez, A; Maldonado, T; Rosas, C.
As has been demonstrated in previous studies, Octopus maya can be fed on artificial diets. In the present study six different diets were assayed. Five diets were designed to test the effect of percentage of inclusion of fish protein concentrate (CPSP: 0, 5, 10, 15, and 20%) and were offered to octopuses as a specifically designed artificial diet. The sixth diet consisted of frozen crab (Callinectes spp) and was used as control diet. Blood metabolites and energy budget of octopuses were evaluated to determine how CPSP levels modulate the digestive capacity and allow retaining energy for growth. Wild animals (316.4 +/- 9.8 g) were used in the study. Results showed that CPSP produced a positive specific growth rate (SGR, % day(-1)) with high value in...
Tipo: Text
Palavras-chave: Energy balance; Blood metabolites; Nutrition; Octopus maya.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3638.pdf

Probiotic effect of FLOC on Vibrios in the pacific white shrimp Litopenaeus Vannamei
Provedor de dados: 5
Autores: Aguilera-rivera, Diana; Prieto-davo, Alejandra; Escalante, Karla; Chavez, Cristina; Cuzon, Gerard; Gaxiola, Gabriela.
The advantages of FLOC over clear water (CW) in rearing juvenile L. vannamei and its effects on Vibrio communities were evaluated. Survival rate in FLOC and clear water were recorded and a probiotic was tested under both conditions. Daily growth rate (DGR) was higher in FLOC (p &lt; 0.05) than in CW. Survival in each system increased significantly when a probiotic was included in the diet (p &lt; 0.05). The Vibrionaceae community from the hepatopancreas (HP) and the culture medium did not differ between the two culture media. Nevertheless, a novel group of Vibrio strains was found to be unique to FLOC. No high level of lesions was observed in shrimp tissues from the FLOC + probiotic treatment; it suggests that the probiotic contributed to homeostasis and...
Tipo: Text
Palavras-chave: FLOC; Probiotic; L. vannamei; Disease; Vibrio.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00173/28379/26694.pdf

The effect of starvation on refeeding, digestive enzyme activity, oxygen consumption, and ammonia excretion in juvenile white shrimp Litopenaeus vannamei
Provedor de dados: 5
Autores: Comoglio, Li; Gaxiola, G; Roque, A; Cuzon, Gerard; Amin, O.
Juveniles of the white shrimp Litopenaeus vannamei were kept Without food for between 0 to 15 clays to evaluate the impact of starvation oil physiologic state (oxygen consumption, poststarvation refeeding, index, nitrogen excretion, and O:N ratio) and digestive enzymes activity. Physiologic changes were found after 6 days of fasting, and refeeding ability declined as a result. Nevertheless. the shrimp were able to Survive 16 days Without food. Starvation Caused metabolism to drop progressively toward a basal level (21 J (.) h(-1 .) g(-1)) and a decrease in the rate of ammonia excretion, because of the catabolism of amino acids front soluble protein in the hepatopancreas. This decrease led to an increase in digestive enzymes specific activity (U/mg...
Tipo: Text
Palavras-chave: Digestive enzymes; Litopenaeus vannamei; Metabolic rate; Shrimp; Starvation.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10877/7911.pdf

Floc contribution on spawning performance of blue shrimp Litopenaeus stylirostris
Provedor de dados: 5
Autores: Emerenciano, Mauricio; Cuzon, Gerard; Goguenheim, Jean; Gaxiola, Gabriela.
The floc system has been successfully applied for shrimp grow-out, but little is known about floc contribution on reproductive performance. In a 30-day trial, spawning performance of broodstock was evaluated in floc and earthen ponds. Floc spawners achieved better results (P &lt; 0.05) compared with pond spawners in terms of number of spawns per ablated female (2.9 vs. 1.3), spawns per spawning female (3.6 vs. 2.4) and number of consecutive maturation (average of 3.6 times compared with 2.5 times in ponds females). Latency period was lower for floc spawners (7.4 days) than pond spawners (10.7 days) (P &lt; 0.05). The percentage of females that spawned at least once were higher in floc (77.1%) when compared with pond spawners (53.8%) (P &lt; 0.05). Number...
Tipo: Text
Palavras-chave: Floc; Litopenaeus stylirostris; Reproduction; Broodstock.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00115/22638/21495.pdf

Effect of dietary protein level on growth and energy utilization by Litopenaeus stylirostris under laboratory conditions
Provedor de dados: 5
Autores: Gauquelin, F; Cuzon, Gerard; Gaxiola, G; Rosas, C; Arena, L; Bureau, D; Cochard, Jean-claude.
A study was conducted using a bioenergetics approach to generate information on energy requirement and feed utilization of Litopenaeus stylirostris. Animals (initial mean weight 21 +/- 1 g were fed ad libitum six experimental diets, ranging from 25 to 58% crude protein (CP), for 50 days.   Weight gain increased from 21 to 30 g with increasing dietary protein level. Survival rates averaged 80%. Basal metabolism (HeE) and heat increment of feeding (HiE) were monitored using respirometry. HeE was on average I U shrimp(-1) day(-1) or 47 U kg live weight(-1) day (22 kJ/kg(0.8). d(-1)), slightly more than what is observed in fish. HiE averaged 0.2 W/sbrimp(-1) day(-1) or 10 W kg live weight(-1) day(-1) (4 kJ/kg(0.8) d(-1)). It represented 3 1 % and 12%...
Tipo: Text
Palavras-chave: Respiration; Excretion; Growth; Dietary protein; L. stylirostris.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6263.pdf

Performance of Penaeus stylirostris After Six Generations of Selection for Growth
Provedor de dados: 5
Autores: Goyard, Emmanuel; Penet, Laurent; Chim, Liet; Cuzon, Gerard; Bedier, Edouard; Bureau, D.
Tipo: Text
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00174/28479/26819.pdf

Differential gene expression in Litopenaeus vannamei shrimp in response to diet changes
Provedor de dados: 5
Autores: Chavez-calvillo, G.; Perez-rueda, E.; Lizama, G.; Zuniga Aguilar, J. J.; Gaxiola, G.; Cuzon, Gerard; Arena-ortiz, L.
We evaluated changes in gene expression of Litopenaeus vannamei shrimp in response to a change in diet by comparing specimens which were fed with an animal protein diet against those which underwent a change from an animal protein diet to a plant protein diet. In addition, we also compared specimens which were fed with a plant protein diet with another group which underwent a change from plant to animal protein diet. Results showed that, in the case of hepatopancreas tissue, a total of six genes were differentially expressed and exhibited a high degree of homology with sequences which codify for proteins related to metabolism, transcription regulation, and rRNA subunits. In the case of muscle tissue, four differentially expressed sequences were recorded...
Tipo: Text
Palavras-chave: Differential display; RT-PCR; Litopenaeus vannamei; Protein diet; Alternative protein sources.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11298/7853.pdf

Is it possible to raise, offspring of the 25th generation of Litopenaeus vannamei (Boone) and 18th generation Litopenaeus stylirostris (Stimpson) in clear water to 40 g?
Provedor de dados: 5
Autores: Cuzon, Gerard; Arena, Leticia; Goguenheim, Jean; Goyard, Emmanuel.
Peneid shrimp are commonly reared in clear-water aquaria or tanks for short-term studies of 4-6 weeks during controlled experiments, such as nutrition studies to estimate dietary nutrient requirements. Recently, in line with the genetic program at Centre Oceanologique du Pacifique (COP), experimental clear-water facilities were tested for the first time over a longer rearing period. Environmental conditions used to maintain animal growth in clear-water system using a well-balanced diet were defined. After 100 days, shrimp growth rates tended to decrease and only by adjusting the diet could shrimp complete their life cycle and reach maturation size of around 40 g. This paper presents information on stocking density, diet quality and husbandry linked to...
Tipo: Text
Palavras-chave: Formulated diets; Husbandry; Quarantine; Litopenaeus stylirostris; Shrimp; Nutrition; Zootechnie; Quarantaine; Litopenaeus stylirostris; Crevette.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-619.pdf

Nutrition of the seabass Lates calcarifer
Provedor de dados: 5
Autores: Cuzon, Gerard; Chou, R; Fuchs, Jacques.
The Primary Production Department of Singapore (PPD) studies covered the weaning of seabass from fingerlings stage onwards and the dietary protein requirement of early grow-out fish. Dietary protein requirement of early grow-out seabass was demonstrated to be between 40-50%, at dietary lipid level of 12%, using fishmeal protein. Nevertheless fish growth was significantly higher with trashfish feed, but apparent protein retention was significantly better with formulated feed.
Tipo: Text
Palavras-chave: Lates calcarifer; Fry; Nutritional requirements; Biochemistry; Food absorption; Growth rate; Fish meal; Seed (aquaculture); Dietary deficiencies; Fingerlings; Lipids; Proteins; Diets; Pellet feeds.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1425.pdf

Physiological and Biochemical Variations during the Molt Cycle in Juvenile Litopenaeus vannamei under Laboratory Conditions
Provedor de dados: 5
Autores: Galindo, Carmen; Gaxiola, Gabriela; Cuzon, Gerard; Chiappa-carrara, Xavier.
Biochemical changes, specifically in hemocyanin and glucose concentrations in hemolymph, glycogen in the digestive gland. were studied throughout the molt cycle in juveniles of Litopenaeus vannamei in a high salinity condition (36), and related to variations in the osmotic capacity of organisms. Increasing hemolymph volume before molting modifies circulating glucose and hemocyanin concentrations acting on the osmotic capacity. Variations in glucose concentrations are indicators of differential energy requirements throughout the molt cycle. Hemocyanin was used as an indirect indicator of the energy consumed by shrimp in various molt processes that affect the osmotic capacity. The co-variability of these metabolites is the result of the biochemical...
Tipo: Text
Palavras-chave: Molt cycle; Litopenaeus vannamei; Hypo osmotic conditions; Biochemistry.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6899.pdf

Détermination des stades d'intermue chez Macrabrachium rosenbergii (caridae) et Penaeus merguiensis (peneidae)
Provedor de dados: 5
Autores: Bourgeois, B.; Cuzon, Gerard; Aquacop.
Ce travail représente une contribution à l'étude de la biologie et de la croissance de la crevette d'eau douce Macrobrachium rosenbergi i (de Man) et de la crevette de mer Penaeus mergaiensis (de Han). Les étapes successives de la période d'intermue ont été déterminées sur des juvéniles afin de pouvoir par la suite approfondir les connaissances de quelques paramètres physiologiques relatifs à la croissance de ces deux espèces. Les notions fondamentales sur le cycle d'intermue des crustacés apportées par Drach (1939) pour les Brachyoures adultes, sont valables avec de légères modifications pour tous les Décapodes qui présentent un exosquelette bien calcifié. Le schéma a été légèrement modifié par le m~e auteur (1944-1967) pour les Natantia dont...
Tipo: Text
Ano: 1975
URL: http://archimer.ifremer.fr/doc/00172/28287/26550.pdf

Partial characterization of hepatopancreatic and extracellular digestive proteinases of wild and cultivated Octopus maya
Provedor de dados: 5
Autores: Martinez, Romain; Santos, R.; Alvarez, A.; Cuzon, Gerard; Arena, L.; Mascaro, M.; Pascual, C.; Rosas, C.
Proteinases from hepatopancreas (HP) and gastric juice (GJ) from wild and cultured red octopus (Octopus maya) were characterized. Hepatopancreas assays revealed optimal activity at pH 4, 9-10 and 10 for wild and pH 3, 8, and 9, for cultured octopuses, for total proteinases, trypsin and chymotrypsin, respectively. In the gastric juice, maximum activity was recorded at pH 6, 8, and 7 for total proteinases, trypsin, and chymotrypsin, respectively for both wild and cultured octopus. A reduction on enzyme activity of 70 and 20% was observed in HP and GJ extracts, respectively when protease inhibitor Pepstatin A was used. That result suggests that the main proteases in the HP were aspartic acid proteinases type (possibly Cathepsin D) and some of them were...
Tipo: Text
Palavras-chave: Cephalopods; Digestive proteinases; Hepatopancreas; Gastric juice; Octopus maya.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00036/14683/17998.pdf

Seasonal variability in trypsin and alpha-amylase activities caused by the molting cycle and feeding habits of juvenile pink shrimp Farfantepenaeus duorarum (Burkenroad, 1939)
Provedor de dados: 5
Autores: Aragon-axomulco, Heron; Chiappa-carrara, Xavier; Soto, Luis; Cuzon, Gerard; Arena, Leticia; Maldonado, Carlos; Cardenas, Rene; Gaxiola, Gabriela.
In view of the relationship between shifts in diet composition and the activity of digestive enzymes in penaeid shrimp, the present study focused on the analysis of digestive trypsin and a-amylase activities of wild Farfantepenaeus. duorarum (Burkenroad, 1939) juveniles and their changes in phenotypic expression, during the molt cycle as endogenous factor and their changes due to different feeding regimes (exogenous factor) in relation with delta C-13 and delta N-15 isotopic signature as an index of food assimilation induced by the seasonal availability of food items in the nursery area. Wild juveniles of F. duorarum were captured from April 2007 to February 2008, in the Celestun coastal lagoon, Yucatan, Mexico. Samplings were carried out considering all...
Tipo: Text
Palavras-chave: Coastal lagoons; Digestive enzymes; Farfantepenaeus duorarum; Feeding habits; Pink shrimp.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00078/18880/16487.pdf

Effect of an herbivorous diet on energy balance of Litopenaeus vannamei at selected ontogenetic stages
Provedor de dados: 5
Autores: Maldonado, Carlos; Cuzon, Gerard; Guzman, Emilio; Brito, Roberto; Soto, Luis; Arena, Leticia; Gaxiola, Gabriela.
Herbivorous (20% vegetable protein, 40% carbohydrate) and carnivorous diets (40% marine animal protein, 20% carbohydrate) were experimentally tested to assess their effect on the energy balance and energetic substrates utilized by postlarvae (PL's /15 days) and juvenile shrimp (3-6 g) of Litopenaeus vannamei. Postlarval stage 60 (PL60, early juveniles) shrimps fed HeD and CaD diets, then late juveniles (3-6 g) acclimated to the same diets were tested for their respective energy partitioning potential. No significant differences (p&gt;0.05) on growth were obtained in early juveniles (mean final wet weight of 0.19 g). However in late juvenile stages a significant difference (p&lt;0.05) in growth rate was observed. In terms of energy partitioning, both early...
Tipo: Text
Palavras-chave: Energy; Juveniles; Metabolism; Protein sources; Shrimp.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7402.pdf

Evaluating the effects of formulated moist diets on juveniles of Patagonian Octopus Enteroctopus megalocyathus (Gould 1852)
Provedor de dados: 5
Autores: Farias, Ana; Pereda, Sandra V.; Uriarte, Iker; Doerner, Jessica; Cuzon, Gerard; Rosas, Carlos.
The aim of this study was to evaluate the performance of Patagonian octopus fed with moist diets formulated with several local feed ingredients. All formulated diets were based on crab paste (70%) and the experimental feed ingredient (30%). Experiment I assayed salmon meal, prime sardine meal, and wheat gluten, using fresh fish as a control; experiment 2 assayed prime fish meal and macroalgal meal against crab paste alone as a control. The ingestion rate was lower than expected for all diets except those of fresh fish, crab paste alone, and crab paste plus prime sardine meal. No significant differences were found in the observed digestibility of the diets, indicating, in general, low digestibility, even for fresh fish. The highest protease values were...
Tipo: Text
Palavras-chave: Octopus; Emeroctopus megalocyathus; Digestibility; Enzymes; Consumption rate; Nutrition; Moist diets.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00030/14106/11342.pdf

Etude de l'ingestion et de l'assimilation chez P.stylirostris à l'aide d'un marqueur formaldéhyde C14 - Essai de modélisation
Provedor de dados: 5
Autores: Cuzon, Gerard; Amouroux, J.m.
Labelled compounds open the way to the study of feed intake mechanisms and assimilation by mollusks and crustacean. When coupling bioassay and modelling, those studies will bring consistent input to the knowledge of fluxes between the animal and its environment (feed, dissolved substances, C02, bacteria). Analog models are used as tool to better understand feed intake and assimilation in shrimp cultured in tanks
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00040/15131/12469.pdf

Selected ingredients for shrimp feed
Provedor de dados: 5
Autores: Cuzon, Gerard.
The selection of ingredients is a high priority for formulating and processing shrimp feeds. One of these selected ingredients is fishmeal which represents 30-40 percent of the whole formulae. It is reviewed some specifications on fishmeal quality in order to determine which one is the best among white and brown fishmeal.
Tipo: Text
Palavras-chave: Proteins; Yeasts; Fish meal; Feed; Feeding.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1465.pdf

Growth factors in Penaeid shrimp feeding
Provedor de dados: 5
Autores: Guillaume, Julien; Cruz, R; Cuzon, Gerard; Wormhoudt Van, A; Revol, A.
Some nutrients known as non essential in vertebrates could be essential in invertebrates and could be related to some "unknown growth factors" which were evidenced or suspected, mainly in mollusc or crustacean flesh or meal, by several authors working on different species of crustaceans. A set of experiments was carried out in our laboratory in order to isolate one of these factors found in squid meal.
Tipo: Text
Palavras-chave: Penaeus japonicus; Food absorption; Digestive system; Haemolymph; Amino acids; Glucose; Digestion; Enzymes; Experimental research; Feeding; Shrimp culture; Laboratory culture.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1464.pdf