Vidya, R and Gomathi, P and Anil, M K and Sasikumar, Geetha and Alloycious, P S (2023) Bivalve maturity scales and estimation of spawning season. Marine Fisheries Information Service, Technical and Extension Series, 258. pp. 31-33. ISSN 0254-380X
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Abstract
Molluscan reproduction is primarily regulated by the interaction of external and endogenous variables. The principal method of assessing the reproductive cycle in bivalves is based on histology. A simplified method for assessing the maturity stages of the gonad is by visual examination of the colour of the mantle tissue, followed by inspection of the fresh gonad smears under a microscope (10X magnification). Many schemes have been used to describe the seasonal reproductive cycle in bivalves. The gametes in bivalves are produced by the germinal epithelium within a web of follicles enveloped by connective tissues. Generally, these schemes recognise: indeterminate stage (immature/inactive stage); then the active stage begins with the multiplication of germ cells; growth of germinal tubules and germinal maturation including vitellogenesis in females, which is followed by sexual maturity including spawning. Usually 35-50 specimens are randomly collected at fortnightly or monthly intervals to assess maturity stages. They are measured and weighed, and a tissue smear from Indeterminate gonad stage in Brown mussel Indeterminate gonad stage in Edible oyster the middle part of the gonad is examined in the laboratory for maturity assessment. The mantle serves not only as the site of gametogenesis but also as the primary storage site for nutrient reserves, particularly glycogen. These reserves are accumulated before spawning and are utilized in gamete formation. Gametes proliferate within the mantle and during the spawning season, they are transported through ciliated channels to paired gonoducts that release them into the mantle cavity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Bivalve; maturity scales |
| Subjects: | Fish and Fisheries > Fish biology > Age and growth Molluscan Fisheries > Bivalves Fish and Fisheries > Fish breeding Fish and Fisheries > Fish biology |
| Divisions: | CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division CMFRI-Vizhinjam |
| Depositing User: | Arun Surendran |
| Date Deposited: | 01 Jul 2024 09:26 |
| Last Modified: | 01 Jul 2024 09:26 |
| URI: | http://eprints.cmfri.org.in/id/eprint/18558 |
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