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Influence of coastal upwelling on the fishery of small pelagics off Kerala, south-west coast of India
In order to evaluate the impact of the interannual changes of upwelling on the small pelagics, the average chlorophyll a concentrations were compared with the fishery. The catch of small pelagics, especially that of the oilsardine increased from 1, 554 t in 1994 to 2,50, 469 t in 2007 in the Malabar...
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| Format: | Printed Book |
| Udgivet: |
Indian J. Fish.
2013
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| Fag: | |
| Online adgang: | http://10.26.1.76/ks/004933.pdf |
| Summary: | In order to evaluate the impact of the interannual changes of upwelling on the small pelagics, the average chlorophyll a
concentrations were compared with the fishery. The catch of small pelagics, especially that of the oilsardine increased from
1, 554 t in 1994 to 2,50, 469 t in 2007 in the Malabar upwelling zone off Kerala, India. The coastal upwelling index (CUI)
during south-west monsoon increased by nearly 50% during the period 1998 to 2007. This substantial increase in coastal
upwelling index elevated chlorophyll a concentration during monsoon which resulted in an increase of over 200% in annual
average chlorophyll a concentration. The increasing coastal upwelling index and chlorophyll a during monsoon sustained an
increasing catch of oilsardine during postmonsoon season. The responses of lesser sardine and Indian mackerel, which are
midlevel carnivores, were different. The population increases of the oilsardine appear to replace decreases in the lesser
sardines and Indian mackerel during the postmonsoon season. |
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| Fysisk beskrivelse: | p.37-42 60(2) |