Analyses of gonadal cycling by oyster broodstock, Crassostrea virginica (Gmelin), in Louisiana

Citation
Je. Supan et Ca. Wilson, Analyses of gonadal cycling by oyster broodstock, Crassostrea virginica (Gmelin), in Louisiana, J SHELLFISH, 20(1), 2001, pp. 215-220
Citations number
17
Categorie Soggetti
Aquatic Sciences
Journal title
JOURNAL OF SHELLFISH RESEARCH
ISSN journal
07308000 → ACNP
Volume
20
Issue
1
Year of publication
2001
Pages
215 - 220
Database
ISI
SICI code
0730-8000(200106)20:1<215:AOGCBO>2.0.ZU;2-J
Abstract
Oysters held near-shore in Caminada Bay, Louisiana during the summer, exhib it hypertrophic gonads with prominent genital canals beneath transparent ma ntle tissue about four weeks post-hatchery spawning, indicating recycling. Broodstock (N = 200) were analyzed histologically over a two-year period to document such gametogenesis, using Gonad/Body Ratios (GBR) and development al stages. Ten oysters were randomly selected from a broodstock pool prior to each spawning attempt, and monthly during the winter-spring. As expected , the mean GBR before successful spawning attempts was significantly greate r (P less than or equal to 0.05) than the mean GBR before unsuccessful atte mpts, A dramatic drop in the percent occurrence of the advanced spawning an d regression stage from May to June, a > 40% spawning stage occurrence from May to October, and fluctuations in the percent occurrence of early and la te developmental stages during the summer months illustrates gonadal recycl ing.