Feeding behaviour and reproductive biology of the shrimp scad Alepes djedaba (Forsskal, 1775) off Cochin coast, Kerala, south India

N. Sajana; S. Bijoy Nandan; C. K. Radhakrishnan

doi:10.21077/ijf.2019.66.3.76411-04

Feeding behaviour and reproductive biology of the shrimp scad Alepes djedaba (Forsskal, 1775) off Cochin coast, Kerala, south India

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Authors

N. Sajana Cochin University of Science & Technology
S. Bijoy Nandan Cochin University of Science and Technology
C. K. Radhakrishnan Cochin University of Science and Technology

https://doi.org/10.21077/ijf.2019.66.3.76411-04

Abstract

Food and feeding habits, sex ratio, spawning behaviour, size at first maturity, fecundity and ova diameter of the shrimp scad Alepes djedaba (Forsskal, 1775) exploited off Cochin coast, Kerala are presented in this study. Â A. djedabat is a pelagic carnivore, with a preference for fishes. Low gastrosomatic index (GaSI) values and very low feeding intensity during spawning season indicated poor feeding behaviour during the period.Â The sex ratio did not deviate from the expected 1:1 ratio. Size at first maturity was estimated to be193 mm for male and 174 mm for female. Monthly gonadosomatic index (GSI) values, monthly distribution of gonadal maturation stages and ova diameter revealed that the species had a prolonged breeding season from June to September with a peak in July. Estimated absolute fecundity was 59,744 to 3,30,190 with an average of 1,94,965 eggs.

Keywords: Alepes djedaba, Fecundity, Feeding behaviour, Ova diameter, Sex ratio

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Author Biographies

N. Sajana, Cochin University of Science & Technology

Research scholar,Â Dept of Marine Biology
S. Bijoy Nandan, Cochin University of Science and Technology

Professor, Dept of Marine Biology
C. K. Radhakrishnan, Cochin University of Science and Technology

Emerittus Professor, Dept of Marine Biology

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Submitted

2017-12-10

Published

2019-09-30

Issue

VOL 66, No 3 (2019)

Section

Articles

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This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.

How to Cite

Sajana, N., Bijoy Nandan, S., & Radhakrishnan, C. K. (2019). Feeding behaviour and reproductive biology of the shrimp scad Alepes djedaba (Forsskal, 1775) off Cochin coast, Kerala, south India. Indian Journal of Fisheries, 66(3). https://doi.org/10.21077/ijf.2019.66.3.76411-04