Fluctuations in mackerel landings at Calicut in relation to hydrographical factors

Pradhan, L B and Reddy, C V Gangadhara (1962) Fluctuations in mackerel landings at Calicut in relation to hydrographical factors. Indian Journal of Fisheries, 9A (1). pp. 100-109.


Download (277kB)
Related URLs:


Of the hydrographical factors, temperature and salinity have been found to exert a profound influence on the fish throughout its life-cycle. The tolerance range of the hydrographical factors of fishes is characteristic of the species. Even within the same species, the degree of tolerance may vary slightly, depending upon the age of fish; the degree of tolerance, however, increases with the growth of fish. Chidambaram (1950), has shown that sardine catches are maximum when the hydrographical factors are within certain limits, during the season. Pradhan (1956) remarks that the entire stock of mackerel, impounded near the mouth of Kali River is apt to die from a sudden fall in salinity, due to the influx of freshwater from the river. Similar observations were made by Hubbs (1948), Jenson (1930), Radovich (1961), Tanoue and Enami (1954), Tonoue (1958 and 1960) and Walford (1946). Hubbs {loc. cit.) showed that seasonal migrations of fish of the west coast of United States are controlled by temperature.

Item Type: Article
Uncontrolled Keywords: mackerel landing; Calicut; hydrographical factors
Subjects: Pelagic Fisheries > Mackerel fishery
Marine Environment > Seawater Analysis
Divisions: CMFRI-Cochin > Marine Capture > Pelagic Fisheries
Subject Areas > CMFRI Brochures > CMFRI-Cochin > Marine Capture > Pelagic Fisheries
Depositing User: Dr. V Mohan
Date Deposited: 05 Aug 2010 08:24
Last Modified: 09 Sep 2015 15:14
URI: http://eprints.cmfri.org.in/id/eprint/1991

Actions (login required)

View Item View Item