ST IES ON LENG IGHT RELATIONSHIPS OF GERRES FILAMENTOSUS CUVIER FROM THE ESTU IES OF T I SOUTHEKN r:ARNAT COAST*
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Abstract
Random samples of Gerres filamentosus Cuvier from the Netravathi-
Gurpur, Mulky, Kallayanapura, Mabukala and Kundapura estuaries of the
southern Karnataka Coast were collected in the years 2000, 2001 and 2002,
and length-weight relationships for each estuary were derived using multiple
linear regression technique with one dummy variable. Hence, combined or
sex-wise length-weight relationships were obtained after testing for
homogeneity and isometric growth condition of fishes for each estuary by ttest.
The extent of closeness of length-weight relationships between sexes
and among estuaries for different years is explained by a trend line graph.
The whole process of multiple linear regression analysis with one dummy
variable is a better substitute for the analysis of covariance technique.
Keywords: Gerres filamentosus, estuaries, length-weight relationships,
multiple linear regression technique