Kripa, V (2017) Role of environmental variables on spawning and recruitment of small pegalics in an upwelling system. In: Course Manual Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management. Lecture Note Series No. 2/2017 . CMFRI; Kochi, Kochi, pp. 289-295.
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29-Role of environmental variables on spawning.pdf Download (1MB) | Preview |
Abstract
The marine ecosystem is dynamic and the variations several abiotic and biotic factors directly and indirectly affect the fish stocks and their population structure. Spawning and recruitment success is to a large extent linked to these environmental variations. It is well known that resources occupy a particular habitat because of their preference to the environmental variables prevalent there and also due the availability of food. We have large shoal forming small pelagic fishes like the sardines and anchovies and the deep water large pelagic and demersals occupying the marine ecosystem from the upper pelagic zone to the benthic realms. Fishing is one of the major activities directly impacting the fish stocks and fishery records show several cases of overfishing leading to stock collapses. Definitely, fishery management tools have supported revival of several of these stocks but have failed to do so in few others. Almost equally important in inducing the biological changes that control maturation, spawning and recruitment are the some ocean atmospheric processes which change inter-annually in the tropics.
| Item Type: | Book Section |
|---|---|
| Uncontrolled Keywords: | environmental variables; spawning; recruitment; small pegalics; upwelling system |
| Subjects: | Pelagic Fisheries |
| Divisions: | CMFRI-Kochi > Fishery Environment Management Division Subject Area > CMFRI > CMFRI-Kochi > Fishery Environment Management Division CMFRI-Kochi > Fishery Environment Management Division Subject Area > CMFRI-Kochi > Fishery Environment Management Division |
| Depositing User: | Arun Surendran |
| Date Deposited: | 20 Sep 2017 08:49 |
| Last Modified: | 20 Sep 2017 08:49 |
| URI: | http://eprints.cmfri.org.in/id/eprint/12190 |
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