Consulta: creatorFacets:"Cosson, Jacky"
Registros recuperados: 10
Data/hora: 01/06/2024 05:32:04

pH controls spermatozoa motility in the Pacific oyster (     Crassostrea gigas     )
Provedor de dados: 5
Autores: Boulais, Myrina; Suquet, Marc; Arsenault-pernet, Marie Eve Julie; Malo, Florent; Queau, Isabelle; Pignet, Patricia; Ratiskol, Dominique; Le Grand, Jacqueline; Huber, Matthias; Cosson, Jacky.
Investigating the roles of chemical factors stimulating and inhibiting sperm motility is required to understand the mechanisms of spermatozoa movement. In this study, we described the composition of the seminal fluid (osmotic pressure, pH, and ions) and investigated the roles of these factors and salinity in initiating spermatozoa movement in the Pacific oyster. The acidic pH of the gonad (5.82 ± 0.22) maintained sperm in the quiescent stage and initiation of flagellar movement was triggered by a sudden increase of spermatozoa external pH (pHe) when released in seawater (SW). At pH 6.4, percentage of motile spermatozoa was three times higher when they were activated in SW containing 30 mM NH4Cl, which alkalinizes internal pH (pHi) of spermatozoa, compared...
Tipo: Text
Palavras-chave: Seminal fluid; Spermatozoa; Motility; PH; Salinity; Ions.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00428/53976/55137.pdf

Sperm features in turbot (Scophthalmus maximus): a comparison with other freshwater and marine fish species
Provedor de dados: 5
Autores: Suquet, Marc; Billard, Roland; Cosson, Jacky; Dorange, Germaine; Chauvaud, Laurent; Mugnier, Chantal; Fauvel, Christian.
This paper presents some features of turbot sperm and compares them with data reported in the literature on other freshwater and marine fish. In captivity, turbot spermiation period lasts 6 months. When compared to other fish species, turbot males are characterized by low values of maximum gonadosomatic index (0.6-0.8%) and are poor sperm producers in terms of volume (0.2-2.2 ml), concentration (0.7-11.0 x 10(9) spermatozoa/ml) and total sperm number released per stripping (0.2-12.0 x 10(9) spermatozoa). Compared to most freshwater species, the duration of cell movement is long (1-17 min). The spermatozoon of turbot can be considered to be of a primitive type. A very high protein content (8.8 mg/ml) is found in the seminal fluid of turbot. Increasing...
Tipo: Text
Palavras-chave: Scophthalmus maximus; Turbot; Biologie du sperme; Liquide séminal; Mobilité du spermatozoïde; Morphologie du spermatozoïde; Poisson marin; Scophthalmus maximus; Turbot; Sperm biology; Seminal fluid; Sperm motility; Sperm morphology; Marine fish.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00188/29893/28334.pdf

Effect of sampling location, release technique and time after activation on the movement characteristics of scallop (Pecten maximus) sperm
Provedor de dados: 5
Autores: Suquet, Marc; Quere, Claudie; Mingant, Christian; Lebrun, Luc; Ratiskol, Dominique; Miner, Philippe; Cosson, Jacky.
Sperm characteristics of scallops have not been well described in the scientific literature. The effects of sperm release technique (thermal shock versus serotonin injection), of sperm collection technique (testis sampling versus serotonin injection), of sperm sampling location along the genital tract, of in vitro sperm maturation, and of time post activation on scallop sperm characteristics were assessed in the present work. Whatever sperm release technique used, no significant differences were observed regarding the percentage of motile spermatozoa and the velocity of the average path (YAP). Compared to testicular sperm, a higher percentage of motile spermatozoa, YAP and intracellular adenosine triphosphate (ATP) content were observed for sperm shed...
Tipo: Text
Palavras-chave: Spermatozoa; CASA; Maturation; Sperm motility; Bivalve; Pecten maximus.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26852/24983.pdf

Sperm motility in European hake, Merluccius merluccius, and characterization of its spermatozoa concentration and volume, spermatocrit, osmolality and pH
Provedor de dados: 5
Autores: Groison, Anne-laure; Suquet, Marc; Cosson, Jacky; Mayer, Ian; Severe, Armelle; Bouquet, Jean-marie; Geffen, Audrey J.; Utne-palm, Anne Christine; Kjesbu, Olav Sigurd.
Due to stock declines there is a growing interest in farming of European hake Merluccius merluccius. Thus, knowledge of its sperm biology is of importance not only for purposes of broodstock management, but also for the development of sperm preservation techniques. Hake sperm were collected from mature males caught during the summer-early autumn waters off western Norway and during the winter-early spring in the Bay of Biscay (France). Sperm quality characteristics were assessed after storage at 4 degrees C for 25 +/- 14 h. Average (+/- SD) values for Norwegian and French samples respectively were (i) sperm volume: 3.9 +/- 4.0 and 2.6 +/- 4.0 ml; (ii) spermatozoa concentration: 6.6 +/- 3.2 and 13.9 +/- 5.1 x 10(9) spermatozoa/ml; (iii) spermatocrit: 80.2...
Tipo: Text
Palavras-chave: Cryopreservation; Merluccius merluccius; Osmolality; PH; Sperm motility; Spermatocrit.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11393/8021.pdf

Biological characteristics of sperm in European flat oyster (     Ostrea edulis     )
Provedor de dados: 5
Autores: Suquet, Marc; Pouvreau, Stephane; Queau, Isabelle; Boulais, Myrina; Le Grand, Jacqueline; Ratiskol, Dominique; Cosson, Jacky.
n brooding mollusc species that incubate larvae before their release in seawater, the biology of gametes remains poorly explored. The present study describes some biological characteristics of sperm of the European flat oyster, a native species that has been over-exploited in the past and is nowadays classified as an endangered species in Europe. Flat oysters were collected by divers in the Rade de Brest (Finistère, France), during its natural reproduction period. Gonadal pH is acidic (6.31 ± 0.10). Spermatozoa are clustered in spermatozeugmata, an acellular structure in which the sperm heads are embedded. After their transfer in seawater, spermatozeugmata have a mean diameter of 64 ± 3 μm and they release free spermatozoa for a mean duration of...
Tipo: Text
Palavras-chave: Oyster; Ostrea edulis; Brooding species; Sperm; Spermatozeugmata; Endangered species.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00454/56539/58245.pdf

Motility characteristics of spermatozoa in cod (Gadus morhua) and hake (Merluccius merluccius)
Provedor de dados: 5
Autores: Cosson, Jacky; Groison, Anne-laure; Suquet, Marc; Fauvel, Christian.
As in many marine fish, motility is triggered by osmotic pressure (OP) in cod and hake spermatozoa and motility ranges several minutes with a high velocity (above 50 mu m/s) period restricted to 100 s. A decrease in the flagellar beat frequency (BF) is partly responsible of this briefness. Detailed observations of the flagella during the motility period showed: 1) sea water provokes OP damages (blebs) which impair the correct wave propagation 2) waves become restricted to the proximal flagellum and tip becomes devoid of wave 3) the wave amplitude decreases. The combination of these factors drastically limits to the earliest period of motility the ability for spermatozoa to efficiently progress towards egg for fertilization.
Tipo: Text
Palavras-chave: Osmotic pressure; Sperm motility; Spermatozoa; Hake; Cod.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6552.pdf

Spermatozoa motility in bivalves: Signaling, flagellar beating behavior, and energetics
Provedor de dados: 5
Autores: Boulais, Myrina; Demoy-schneider, Marina; Alavi, Sayyed Mohammad Hadi; Cosson, Jacky.
Though bivalve mollusks are keystone species and major species groups in aquaculture production worldwide, gamete biology is still largely unknown. This review aims to provide a synthesis of current knowledge in the field of sperm biology, including spermatozoa motility, flagellar beating, and energy metabolism; and to illustrate cellular signaling controlling spermatozoa motility initiation in bivalves. Serotonin (5-HT) induces hyper-motility in spermatozoa via a 5-HT receptor, suggesting a serotoninergic system in the male reproductive tract that might regulate sperm physiology. Acidic pH and high concentration of K+ are inhibitory factors of spermatozoa motility in the testis. Motility is initiated at spawning by a Na+-dependent alkalization of...
Tipo: Text
Palavras-chave: Adenosine triphosphate (ATP); Ion signaling; PH; Serotonin (5-HT); Spermatozoa motility; Spermatozoa velocity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00502/61392/65055.pdf

Biological characteristics of European hake (Merluccius merluccius) sperm
Provedor de dados: 5
Autores: Groison, Anne-laure; Suquet, Marc; Cosson, Jacky; Le Coz, Jean-rene; Jolivet, Aurelie; Garren, Francois.
Very little is known on European hake's reproductive biology and especially on biological characteristics of its sperm despite a growing interest in its aquaculture potential. This study reports, for the first time some hake sperm characteristics. After activation, the swimming phase lasts 3 min (8 min when activated with 50% sea water (SW) but lower initial velocity). The initial flagellar beat frequency (BF), velocity and percentage of motile cells decreased after 100 s. After 2 days at 4 degrees C, the mean Adenylate Energy Charge (AEC) level was 0.71. Sperm stored at 4 degrees C still showed motility after 9 days for 2 individuals. When cryopreserved, the motility recovery index of thawed spermatozoa ranged from 11.8% to 29.6%.
Tipo: Text
Palavras-chave: AEC; Gamete quality; Sperm motility; Sperm Density; Merluccius merluccius.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6553.pdf

Quality assessment of cryopreserved black-lip pearl oyster Pinctada margaritifera spermatozoa
Provedor de dados: 5
Autores: Demoy-schneider, Marina; Schmitt, Nelly; Le Pennec, Gael; Suquet, Marc; Cosson, Jacky.
High quality of sperm is essential to a high fertilization rate, especially post- cryopreservation. Assessment of sperm integrity, motility and energy reserves before cryopreservation is necessary for selection of milt with optimal fertilizing potential. We describe the effect of cryopreservation on the quality of black-lip pearl oyster, Pinctada margaritifera var. cumingii sperm. Evaluated quality indices of fresh and frozen/thawed P. margaritifera spermatozoa, included morphology, ultrastructure and motility characteristics relative to the energy content (ATP) and its capacity to be sustained by mitochondrial respiration. Morphology and ultrastructure were quantitatively evaluated using images obtained by optical microscopy assisted by the Image J...
Tipo: Text
Palavras-chave: Spermatozoa quality; Cryopreservation; Pinctada margaritifera; Motility; Metabolism; CASA.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00453/56421/58114.pdf

Sperm movement and fecundance in scallops(pecten maximus) and oysters (crassostrea gigas)
Provedor de dados: 5
Autores: Devauchelle, Nicole; Cosson, Jacky; Orsini, Laurent; Faure, Catherine; Girard, Jean-pierre.
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00044/15567/12964.pdf