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IJMS Vol.39(2) [June 2010] >


Title:  Reproductive biology of Sardinella longiceps along Ratnagiri coast off Maharashtra
Authors: Deshmukh, A V
Kovale, S R
Sawant, M S
Shirdhankar, M M
Funde, A B
Keywords: Sardinella longiceps
Length-weight relationship
Gonadosomatic index
Maturity
Ratnagiri
Issue Date: Jun-2010
Publisher: CSIR
Abstract:  Indian oil sardine Sardinella longiceps is a highly migratory fish with large scale shoaling along the coast of Ratnagiri. Length weight relationship equations analysed for males were W = 0.0350 L2.4918 females were W = 0.0536 L2.3410, indeterminants were W = 0.0200 L2.7021 and for combined sexes were W = 0.0321 L2.5225 indicating no significant difference between the sexes of S. longiceps. Average GSI values of females were 1.4998 with maximum GSI value 5.4962 in the month of September and minimum (0.4299) GSI value in the month of October. In males the maximum GSI value 4.4962 were observed in the month of September and minimum GSI value 0.2992 were observed in the month of October. Observations reveal that spawning in S. longiceps generally takes place only once in a year. Females were always more in number with an average ratio of 1 male:1.1549 females with highest ratio in the month of January. Size at maturity varied from 16 to 20 cm, with occurrence of well developed mature gonads in the months of August-September and spent ones in the months of November to February. Number of mature eggs in the ovaries of the gravid females with the total weight of fish ranging from 50-60 kg varied from 45,000-75,000.
Page(s): 274-279
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.39(2) [June 2010]

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