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Registros recuperados: 67
Primeira ... 1234 ... Última
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Áreas potenciales de descarte de merluza para la actividad de la flota comercial argentina OceanDocs
Dato, C.V.; Villarino, M.F.; Cañete, G.R..
To improve the quality of the resource assessment it is necessary to estimate discards and quantify them applying an adequate methodology. The purpose of this work is to detect areas where the activity of the commercial fleet coincides with zones of high concentration of juveniles because they are potential discard areas. To establish possible seasonal and/or interannual variations, length distribution data derived from hake research surveys carried out on board of INIDEP vessels during the 1986-1993 period were analyzed. Samples were grouped per statistical rectangle on the basis of catch weighted average and mean, variance, skewness and kurtosis were calculated. The resulting parameters were subjected to a cluster analysis using the Euclidean distance...
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Commercial fishing; Fishing grounds; Juveniles; Fishing effort; Seasonal variations; Fishing grounds; Juveniles; Fishing effort; Http://aims.fao.org/aos/agrovoc/c_2947; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_24027.
Ano: 2006 URL: http://hdl.handle.net/1834/1586
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Biometrie et Croissance des Jeunes Crevettes Trachypenaeus de la Guadeloupe (Antilles Francaises). ArchiMer
The principal biometric relations of juvenile Trachypenaeus similis similis and T. constrictus in Guadeloupe were calculated from 1976 to 1978. The examination of these relations yields few differences between the two species. A growth curve was established according to the sequences of modal values; these were determined according to weekly size frequency distributions over three different periods of time. In the zone studied, the growth of young Trachypenaeus is more rapid than that of the young Penaeus.
Tipo: Text Palavras-chave: Trachypenaeus; Juveniles; Size distribution; Growth curves; Biometrics.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1932.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie de crevette grise, Deuxième partie ArchiMer
Vacherot, Jean-philippe; Dupouy, Herve; Meillat, Marc.
Starting from the year 2000, the European Union planned to establish the use of a selective trawl in brown shrimp (Crangon crangon) fisheries. In fact, the brown shrimp is caught by a bottom trawl equipped with stretched 20 mm exempted meshing in estuary areas where the nurseries of flat fish and gadidae are located. For Vilaine's estuary, Dupouy et al (1997) estimated at about 1 tonne of flat fish and one tonne of gadidae the loss in equivalent fish of marketable size, per landed tonne of brown shrimp. In this document, the authors introduce improvements resulting from the use of selective trawls developed in France (Asselin and Devismes trawls), and they show by what means the selectivity of these trawls can be improved further.
Tipo: Text Palavras-chave: Bay of Vilaine; Common shrimp; Selective trawl; Whiting; Pout; Gadides; Soles; Juveniles; Baie de Vilaine; Crevette grise; Chalut sélectif; Merlan; Tacaud; Gadidés; Soles; Juvéniles.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/rapport-2670.pdf
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COMPOSICIÓN Y DENSIDAD DE CORALES JUVENILES EN DOS ARRECIFES PROFUNDOS DE SAN ANDRÉS ISLA, CARIBE COLOMBIANO Boletín de Investigaciones
Vidal,Andrés M; Villamil,Claudia M; Acosta,Alberto.
El reclutamiento de corales en un arrecife determina el mantenimiento, la renovación y la estructura futura de las comunidades coralinas. Con el objeto de conocer la composición, densidad y el valor de importancia de corales juveniles escleractínios (< 2 o < 4 cm de diámetro; según la especie) se muestrearon dos localidades (Reggae Nest y El Faro) en la terraza profunda de sotavento, a 20 m de profundidad, en la isla de San Andrés. Así mismo, se cuantificó la frecuencia de mortalidad parcial, total, enfermedades y signos de depredación en los juveniles, en 47 cuadrantes de 1m², distribuidos a lo largo de una cuerda guía. Se registró un total de 397 juveniles coralinos pertenecientes a 16 especies. La densidad promedio y riqueza de juveniles no...
Tipo: Journal article Palavras-chave: Corales escleractínios; Juveniles; Composición; Densidad; San Andrés.
Ano: 2005 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612005000100010
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Composición y densidad de corales juveniles en dos arrecifes profundos de San Andrés Isla, Caribe colombiano OceanDocs
Vidal, A.M.; Villamil, C.M.; Acosta, A..
Coral recruitment determines the maintenance, renovation and future of the coral community. In order to determine the composition, density and importance value of scleractinian juvenile corals (<2 or < 4 cm of diameter; depending of the species) two localities were sampled (Reggae Nest and El Faro) at the deep leeward terrace site of San Andres Island. Also, in 47 quadrants of 1m2 distributed throughout a guide line, frequency of partial mortality, total diseases and depredation signs in juvenile corals were quantified. A total of 397 juveniles of 16 species were egistered. The average density and richness of juveniles were not significantly different between Reggae Nest and El Faro. The average density of both localities was high compared to other...
Tipo: Journal Contribution Palavras-chave: Juveniles; Composition; Density; Coral; Density; Juveniles; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_25393.
Ano: 2005 URL: http://hdl.handle.net/1834/2015
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Consideraciones sobre el crecimiento de la caballa (Scomber japonicus marplatensis)durante su primer año de vida OceanDocs
Sánchez, R.P..
Through the analysis of the morphological changes ocurring in the process of growth, it was possible to identify three stages (primary juvenile: 25-75 mm; secondary juvenile: 76-160 mm; and juvenile preadult: 161-250 mm)during the first year of the species life. Regression equations for the different relations studied: body weight/body lenght, body surface/body lenght, body surface/body weight, and metabolic rate/body lenght, have been calculated for each stage. The variation of the number of gill rakers, mean distance between adjacent rakers and mean values of gill rakers lenght in reference to body growth was studied, and the relation between filtering area and body length was established.
Tipo: Journal Contribution Palavras-chave: Length-weight relationships; Condition factor; Gills; Juveniles; Mackerel fisheries; Gills; Http://aims.fao.org/aos/agrovoc/c_3262.
Ano: 1982 URL: http://hdl.handle.net/1834/2047
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Consommation d'oxygene de la crevette japonaise, Penaeus japonicus , en fonction de l'oxygenation du milieu: Effects de la temperature et de l'acclimatation a des conditions ambiantes hypoxiques ArchiMer
Truchot, J; Jouve, D.
Oxygen consumption of juvenile prawns, Penaeus japonicus , was measured during the day at 4 temperatures (23, 26, 30 and 33 degree C) and at various oxygenation levels. For inactive prawns burrowed into sand, respiratory metabolism was maintained almost constant in hypoxia above a critical oxygen pressure of about 30-40 Torr. Data analysis according to a hyperbolic model indicates that the capacity for metabolic regulation was optimal between 26 and 30 degree C. Prawns acclimated 1-2 weeks at 20 degree C in moderate hypoxia (P sub(O2) around 50-55 Torr) showed a reinforced regulation of oxygen consumption when compared to normoxic controls.
Tipo: Text Palavras-chave: Penaeus japonicus; Malacostraca; Juveniles; Respiration; Hypoxia; Dissolved oxygen; Temperature effects; Oxygen consumption; Crevettes Pénaeides; Température; Hypoxie; Métabolisme respiratoire.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-1192.pdf
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Crecimiento del lenguado Paralichthys orbignyanus (Valenciennes, 1839) en condiciones de cultivo OceanDocs
Fraysse, C.; Petraroia, A..
Mariculture in Argentina has expanded over the last years. Flounders of the Paralichtydae family are a very important fishery resource due to their abundance, meat quality, and high market price. The first mass production of juveniles of Paralichthys orbignyanus in captivity was successfully performed in 2002 at the Estación Experimental de Maricultura (EEM), Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata. Moreover, it has got potential as a species for cultivation, due to its behaviour in captivity, good growth, survival and feed conversion rates. In this study, the parameters that affect this flounder cultivation under controlled conditions and in closed recirculating seawater system, are presented. Temperature, pH, and...
Tipo: Theses and Dissertations Palavras-chave: Fish culture; Controlled conditions; Recirculating systems; Juveniles; Marine aquaculture.
Ano: 2013 URL: http://hdl.handle.net/1834/5445
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Croissance de l'huitre japonaise Crassostrea gigas en cylindre rotatif Stanway. Premiers resultats en France ArchiMer
Robert, Rene; Maurer, Daniele.
A new method of oyster cultivation, the Stanway oyster cylinder, has been experimented in the basin of Arcachon since the autumn of 1989. The first observations on three species of juvenile bivalves showed that this system could be successfully used with the Japanese oyster Crassostrea gigas . A comparative study of the growth of this last species, reared in cylinders and oyster bags, has been carried out since spring 1990. The first results showed that the growth of juveniles and 18 months old oysters in cylinders is not as good as in bags. On the other hand, mortality did not differ between both techniques: less than 3%. This new system seems to be less efficient than the traditional French way of rearing oysters. However, an improvement in the quality...
Tipo: Text Palavras-chave: Crassostrea gigas; Bivalvia; Juveniles; Oyster culture; Growth; Rearing.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-917.pdf
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Définition d'un modèle d'élevage larvaire intensif pour la daurade Sparus auratus ArchiMer
Ounais-guschemann, Nadia.
This study defines rearing parameters for mass products of 30-day old post larvae. Continuous lighting (600 lux) optimizes the predatory activity and suppresses the feeding rhythm. For 4-5 mm larvae (15 days), food ingestion slows down if the prey concentration in the tank is below 5 rotifers/ml, while there is no such threshold for 6-7 mm larvae (22 days). The rotifer Brachionus plicatilis , between 100 and 200 mu m, is an adequate initial prey, it can be replaced by Artemia salina for 7-8 mm larvae (30 days). It is observed that free amino acids and essential fatty acids contents have a prominent role in larvae growth; docosahexaenoic acid (C22:6n-3) content could be determined. Finally, the development of the swim bladder is facilitated by the renewal...
Tipo: Text Palavras-chave: Sparus auratus; Pisces; Marine fish; Environmental diseases; Fatty acids; Amino acids; Controlled conditions; Juveniles; Culture tanks; Growth; Light effects; Nutritional requirements; Fish larvae; Syndrome de paroi; Nutrition; Alimentation; Lumière; Inflation primaire de la vessie natatoire; Sparus auratus; Elevage larvaire intensif; Poisson.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/these-1679.pdf
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Desarrollo larval de merluza (Merluccius hubbsi) considerando aspectos ecomorfologicos OceanDocs
Betti, P..
The ontogeny of the first stages of development of hake (Merluccius hubbsi)considering yolksac larvae, preflexion larvae, larvae in flexion, postflexion larvae, transformation larvae and posttransition juveniles, is described. Fish larvae and posttransition juveniles were collected in the north Patagonian area, between 42° and 46°S, from surroundings of the coast to the 100 m isobath (Argentine Sea, SW Atlantic). The larvae were collected between December and February, and the posttransition juveniles, in April and June since 1989 to 2004. The morphometrics variables and pigmentation were recorded in 127 larvae y 41 posttransition juveniles ranging in total length (TL)from 2.0 to 35.0 mm. Additionally, the openning of the mouth was calculated and...
Tipo: Theses and Dissertations Palavras-chave: Fish larvae; Juveniles; Ontogeny; Morphogenesis; Morphogenesis; Fish larvae; Juveniles; Ontogeny; Http://aims.fao.org/aos/agrovoc/c_4943; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_12941.
Ano: 2005 URL: http://hdl.handle.net/1834/2599
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Development of diets for Penaeus aztecus, Penaeus setiferus, Penaeus vannamei and Penaeus stylirostris juveniles and postlarvae ArchiMer
Zein-eldin, Z.
Laboratory Studies of penaeid feeding and nutrition were performed at the Galveston laboratory of NMFS between 1963 and 1985. Earliest studies used field-collected Penaeus aztecus postlarval and juvenile stages of both wild and laboratory-spawned P. aztecus and P. setiferus and laboratory-spawned P. vannamei and P. stylirostris were later included.
Tipo: Text Palavras-chave: Penaeus stylirostris; Malacostraca; Dried products; Fish meal; Growth; Alginates; Spawning; Shrimp culture; Juveniles; Nutrition; Feeding.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1460.pdf
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Diferencias estacionales en la dieta de individuos juveniles del Pingüino Patagónico (Spheniscus magellanicus) reveladas en base al análisis de isótopos estables en uñas Hornero
Silva,Laura A; Siles,Laura; Cardona,Luis; Tavares,Mauricio; Crespo,Enrique; Gandini,Patricia.
Se realizó un análisis de isótopos estables en uñas para evaluar la composición de la dieta y el uso estacional de los recursos tróficos en individuos juveniles de Pingüino Patagónico (Spheniscus magellanicus) provenientes de las costas de Brasil. El análisis se llevó a cabo sobre las porciones basal y distal de las uñas, correspondientes a la temporada invernal y a la reproductiva, respectivamente, en función del tiempo de integración de la señal isotópica determinado por la tasa de crecimiento de la uña y la fecha de colecta. Se observaron diferencias significativas en las señales isotópicas de las dietas correspondientes a las temporadas reproductiva e invernal, sugiriendo diferencias en las contribuciones relativas de las presas. Durante la temporada...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dieta invernal; Isótopos; Juveniles; SIAR; SIBER; Spheniscus magellanicus; Uñas.
Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0073-34072015000200001
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Differentiation de juveniles de Chlamys varia et Chlamys opercularis ArchiMer
Morizur, Yvon.
The recent developments in collecting techniques for spat of Chlamys operoularis and Chlamys varia make it necessary to find criteria for separating these two species at early life stages. Biométrie criteria for differenciating between species have been found to be usable on individuals of a height superior to 3 mm. A quick différenciation of smaller individuals is possible by observation, under light microscope, of the périostracum external morphology on left valves.
Tipo: Text Palavras-chave: Chlamys; Aquaculture techniques; Juveniles.
Ano: 1977 URL: http://archimer.ifremer.fr/doc/1977/acte-2343.pdf
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Digenean metacercariae parasites as natural tags of habitat use by 0-group common sole Solea solea in nearshore coastal areas: A case study in the embayed system of the Pertuis Charentais (Bay of Biscay, France) ArchiMer
Durieux, Eric; Begout, Marie-laure; Pinet, Patrick; Sasal, Pierre.
This study focused on the spatio-temporal variation in the host-parasite system, 0-group sole-digenean metacercariae, in nearshore coastal areas at relatively small spatial scale. 0-group soles were sampled using a standard beam trawl in April, May, June, August and October 2005 at nine different sites in the Pertuis Charentais area (Bay of Biscay, France). Sole density, size, Fulton's condition factor K and digenean metacercariae communities were analysed. 0-group sole concentrated in shallow and muddy areas where they accumulated digenean metacercariae. Parasite communities displayed strong spatial patterns tightly linked to the distribution of the first intermediate mollusc hosts. These parasitological data suggest that 0-group sole during their first...
Tipo: Text Palavras-chave: Flatfish; Juveniles; Trematodes; Parasite Community; Spatio-temporal Dynamics; Habitat Use.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11924/8640.pdf
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Early postlarval fish in the hyperbenthos of the Dutch Delta (south-west Netherlands) OMA
Beyst, B.; Mees, J.; Cattrijsse, A..
Early (post)larval fish constitute a significant part of the temporary hyperbenthos, i.e. of the fauna living in the lower reaches of the water column close to the substratum. Information on the densities and spatial and temporal variations of these stages, as well as on their lengths at the moment of occurrence, can be an important contribution to the knowledge of their dispersion, migrations and to the identification of possible bottlenecks in their recruitment. Therefore the hyperbenthos of the Voordelta, a shallow coastal zone in front of the Dutch Delta, as well as that of the subtidal channels and the intertidal brackish marsh creeks of the Westerschelde Estuary, was sampled monthly during one year by means of a sledge and a stow net. A total of 37...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community composition; Deltas; Dominant species; Ecological distribution; Estuaries; Intertidal environment; Juveniles; Marine fish; Nursery grounds; Pleuronectes; Population density; Salt marshes; Sprattus sprattus; Wetlands; Zoobenthos; Clupea harengus; Dicentrarchus labrax [Bass]; Solea solea [Sole].
Ano: 1999 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3979
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Ecología trófica de estadios juveniles de los esciénidos dominantes en el estuario de Bahía Blanca. Pescadilla de red (Cynoscion guatucupa) y corvina rubia (Micropogonias furnieri) OceanDocs
Sardiña, P..
Striped weakfish (Cynoscion guatucupa)and whitemouth croaker(Micropogonias furnieri)are one of the most important coastal resources of Bahia Blanca Estuary (Buenos Aires Prov., Argentina). The aims of this thesis were: 1, to analyze the population and morphological characteristics of the juveniles stages of the striped weakfish and the whitemouth croaker living in Bahia Blanca Estuary; 2, to describe the dietary habits of the juveniles of these two species; 3, to analyze the ontogenetic and seasonal diet changes in both species, and 4, to study the feeding interrelationships between both species as well as the interrelationships between each species and its prey. In view of the mentioned objectives, diet was evaluated taking into account the following...
Tipo: Theses and Dissertations Palavras-chave: Brackishwater environment; Brackishwater fish; Comparative studies; Feeding behaviour; Trophic relationships; Zooplankton; Juveniles; Feeding behaviour; Zooplankton; Brackishwater environment; Juveniles; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_1050; Http://aims.fao.org/aos/agrovoc/c_25393.
Ano: 2004 URL: http://hdl.handle.net/1834/2595
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Efecto de diferentes relaciones proteína/energía en el crecimiento de juveniles de Langosta espinosa (Panulirus argus) OceanDocs
Fraga, I.; Galindo, J.; de Arazoza, M.; Blanco, W.; Díaz-Iglesias, E.; Báez, M.; Bravet, E..
Para evaluar el efecto de diferentes relaciones proteína/energía en el crecimiento de juveniles de langosta Panulirus argus (peso medio inicial de 180 ± 3.8 g), se desarrolló un diseño experimental totalmente aleatorizado durante 5 meses, con 7 tratamientos y 16 repeticiones. Se ensayaron dietas con 25, 35 y 45% de proteína, con niveles altos y bajos de energía (324-359 Kcal/100 g) y relaciones proteína/energía entre 70.5 y 137.2 mg de proteína/Kcal. Al final del bioensayo se determinaron los indicadores nutricionales básicos y se comparó el flujo energético producido en la respiración y excreción nitrogenada entre langostas alimentadas con las dietas isocalóricas (356 Kcal/100 g) de 25 y 45% de proteína. Se concluyó que las langostas requieren para crecer...
Tipo: Proceedings Paper Palavras-chave: Juveniles; Feeding experiments; Animal growth; Proteins; Lobster culture; Juveniles; Proteins; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_6259.
Ano: 2002 URL: http://hdl.handle.net/1834/1879
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Efectos de temperatura y salinidad sobre el crecimiento de juveniles de besugo Pagrus pagrus (Linné,1758)(Actinopterygii; Perciformes) en sistemas de recirculación cerrada OceanDocs
Suárez, J..
The growth and survival of juvenile red porgy, Pagrus pagrus, reared in captivity (mean body weigth 81.0 not equal to 37.24g), exposed to two different temperatures (18 degree and 22 degree C)and three salinities (21, 27 and 33 psu)during a 30 day period, were studied. Final survival rate was 100. in all treatments. The highest growth rate was reached at 18 degree C/33 psu with a value of 1.07 /day. There was an inverse trend in the growth rate between the two temperatures. Food consumption increased with the increase of salinity and temperature. The highest food consumption rate was 1.17. (18 degree C/33 psu). The relationships between protein efficiency ration (PER)and salinity were positive at 18 degree C and negative at 22 degree C. The highest values...
Tipo: Theses and Dissertations Palavras-chave: Environmental effects; Fish culture; Food consumption; Growth; Juveniles; Recirculating systems; Survival; Marine aquaculture; Fish culture; Food consumption; Growth; Juveniles; Survival; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_3016; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_7538.
Ano: 2004 URL: http://hdl.handle.net/1834/2601
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Effect of an herbivorous diet on energy balance of Litopenaeus vannamei at selected ontogenetic stages ArchiMer
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>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<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
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