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The influence of some hydrographical factors on the fisheries of Cochin area

DRS at CSIR-National Institute of Oceanography

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Title The influence of some hydrographical factors on the fisheries of Cochin area
 
Creator Sankaranarayanan, V.N.
Qasim, S.Z.
 
Subject Fisheries
algal blooms
euphotic zone
abundance
nutrients (mineral)
upwelling
hydrography
fisheries
ISW, India, Kerala, Cochin
 
Description From the seasonal changes in the hydrographical features of Cochin area during the year 1965-66, it is possible to deduce that a shore-ward influx of upwelled water occurs from about June to October The effect of this water is felt in very shallow areas During this period the bottom layers become cold, markedly saline, poorly oxygenated and rich in nutrients Minimum oxygen of less than 0.5 ml/L is recorded at 10 m in August The fish populations are not very abundant during this season and tend to avoid the oxygen-deficient water Both fish and prawn catches are poor from June to September The available evidences show that the enrichment of the euphotic zone with nutrients in the post-upwelling period produces an intense phytoplankton bloom The red-tide phenomenon which acts as a further threat to fish life is of common occurrence during this season From November onwards there is a reappearance of fish shoals in coastal waters and a resumption of large scale fishing activity
 
Date 1993-12-08T09:56:27Z
2017-09-29T13:47:25Z
1993-12-08T09:56:27Z
2017-09-29T13:47:25Z
1968
 
Type Journal Article
 
Identifier Bulletin of National Institute of Sciences of India, vol.38; 1968; 846-853
0027-9528
http://drs.nio.org/drs/handle/2264/5990
 
Language en
 
Relation B Natl Inst Sci India
NON-SCI
 
Publisher National Institute of Sciences of India