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On the pattern of decrease in the abundance of mackerel in the inshore waters off Karwar within a fishing season

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Title On the pattern of decrease in the abundance of mackerel in
the inshore waters off Karwar within a fishing season
Not Available
 
Creator Banerji,S K
 
Subject abundance
mackerel
Karwar
 
Description Not Available
It is a well known fact that the mackerel fishery in India shows wide fluctuations from
year to year. This intra-seasonal fluctuation is generally reflected by the mean seasonal
index of abundance which is obtained by dividing the total catch (either in number or by
weight) by the total effort in the season. Apart from this intra-seasonal fluctuation, there is
the inter-seasonal variation in the abundance of mackerel. While there is no pattern in the
intra-seasonal fluctuations in abundance, a definite pattern is noticed in the variation of abundance
of mackerel within a season. In the inshore waters off Karwar, the mackerel fishery
starts generally in the month of October ; then the fishery reaches its peak when the maximum
abundance of mackerel is noticed in the inshore waters and thereafter the abundance of mackerel
begins to the fall down till the mackerel population completely disappears from the inshore
waters by about the month of April or May. This decrease in abundance of mackerel population in the inshore waters during a season is due to several factors viz., (a) decrease due to
fishing, (b) decrease due to migration away from the fishing grounds, (c) decrease due to
natural mortality etc. It is of interest to examine if the rate of inter-seasonal decrease in abundance
of mackerel stock is in any way dependent on the seasonal abundance of mackerel
or it is independent of the seasonal abundance of mackerel. This aspect of the mackerel
fishery has been examined in this paper with reference to fishery data of Karwar from 1948-49
to 1958-59 and the implications of the findings have been discussed. It is felt that the same
aspect of the fishery needs examination with respect to data of other regions.
Not Available
 
Date 2021-08-09T09:40:17Z
2021-08-09T09:40:17Z
1963
 
Type Article
 
Identifier Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/53871
 
Language English
 
Relation Not Available
 
Publisher CMFRI/ICAR