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Journal of Shellfisheries Research

Reproductive biology of the “Copey” snail Melongena melongena in Cispata Bay on the Caribbean coast of Colombia

Reproductive biology of the “Copey” snail Melongena melongena in Cispata Bay on the Caribbean coast of Colombia Sandra Hernandez ABSTRACT The reproductive cycle of the “Copey” snail Melongena melongena at Cispata Bay was examined from October 1998 to September 1999. Gonad maturation was studied through macroscopic and microscopic observations on the gonads of females >70 […]

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Journal of Shellfisheries Research

Biological and chemical properties of the secretion from the hypobranchial gland of the purple snail Plicopurpura pansa

Biological and chemical properties of the secretion from the hypobranchial gland of the purple snail Plicopurpura pansa Ludwig C.A. Naegel ABSTRACT The hypobranchial gland of the muricid Plicopurpura pansa (Gould, 1853) is so active that the snails can be stimulated periodically without harming them to expulse the secretion. This property is a great advantage in […]

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Journal of Shellfisheries Research

Genetic structure of cultured Haliotis diversicolor supertexta populations

Genetic structure of cultured Haliotis diversicolor supertexta populations Zhongbao Li ABSTRACT Genetic structure of four cultured Haliotis diversicolor supertexta populations were investigated using the assay of vertical slab polyacrylamide gel electrophoresis. Low levels of genetic diversity of populations was found: mean numbers of alleles per locus ranged from 1.4 to 1.5: proportions of polymorphic loci […]

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Journal of Shellfisheries Research

Effects of antibiotics on the concentration of bacteria in biofilms and on the growth of Haliotis rufescens postlarvae

Effects of antibiotics on the concentration of bacteria in biofilms and on the growth of Haliotis rufescens postlarvae Casandra Anguiano-Beltran ABSTRACT The effects of chloramphenicol and streptomycin/penicillin on the concentration of heterotrophic bacteria in biofilms associated with abalone postlarval culture and on the growth and survival of Haliotis rufescens postlarvae (3-5 days old) were studied […]

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Journal of Shellfisheries Research

Genetic management guidelines for captive propagation of freshwater mussels

Genetic management guidelines for captive propagation of freshwater mussels Jess W. Jones ABSTRACT Although the greatest global diversity of freshwater mussels (~300 species) resides in the United States, the superfamily Unionoidea is also the most imperiled taxon of animals in the nation. Thirty-five species are considered extinct, 70 species are listed as endangered or threatened, […]

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Journal of Shellfisheries Research

Lipid classes and fatty acid composition in female gonads of great scallops—a selective field study

Lipid classes and fatty acid composition in female gonads of great scallops—a selective field study Arne Duinker ABSTRACT Fatty acid composition was analyzed in neutral lipids (NL), phosphatidyletanolamine (PE) and phosphatidylcholine (PC) of Pecten maximus (L.) ovaries from Western Norway. Individual ovaries were selected based on macroscopic characterization. Two series were compared; (1) ovary development […]

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Journal of Shellfisheries Research

Captive breeding behavior of four strombidae conch

Captive breeding behavior of four strombidae conch Amber L. Shawl ABSTRACT The feasibility of a captive breeding program was examined for the protected fisheries species Strombus gigas (queen conch) and three nonprotected Caribbean Strombus conch species: S. raninus (hawk-wing conch), S. alatus (Florida fighting conch), and S. costatus (milk conch). A total of 24 adult […]

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Journal of Shellfisheries Research

Factors influencing recruitment of hatchery reared pearl oyster spat

Factors influencing recruitment of hatchery reared pearl oyster spat Pedro E. Saucedo ABSTRACT We evaluated experimental collection of Pinctada mazatlanica spat on substrates of different textures and colors placed at different depths within settlement tanks. When larvae reached the pediveliger stage (day 25), black-colored spat collectors (“envelope” type) composed of the following materials were offered […]

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Journal of Shellfisheries Research

Seasonal variation of heat shock protein 70 in Eastern oysters infected with Perkinsus marinus

Seasonal variation of heat shock protein 70 in Eastern oysters infected with Perkinsus marinus Vincent G. Encomio ABSTRACT Eastern oysters (Crassostrea virginica) inhabit highly variable environments and are exposed to large seasonal shifts in temperature. Prevalence and intensity of oyster diseases, particularly Perkinsus marinus (Dermo), increase during thermally stressful periods, thus posing additional stress on […]

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Journal of Shellfisheries Research

Effect of dietary ascorbic acid levels on reproductive performance of shrimp, Litopenaeus vannamei , broodstock

Effect of dietary ascorbic acid levels on reproductive performance of shrimp, Litopenaeus vannamei , broodstock Shaobo Du ABSTRACT This study was conducted to investigate the effect of dietary ascorbic acid (AA) on reproductive performance of shrimp Litopenaeus vannamei. Stay C-35 (a stable derivative, mainly monophosphate) was selected as AA source. Four grade levels of ascorbic […]