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Length at maturity and relationship between weight and total length of five deep-sea fishes from the, Andaman and Nicobar Islands of India, North-eastern Indian Ocean

Published online by Cambridge University Press:  15 June 2020

Mullasseri Sileesh Open the ORCID record for Mullasseri Sileesh [Opens in a new window] ,
B. Madhusoodana Kurup  and
Alphi Korath
Mullasseri Sileesh*
Affiliation:
School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Cochin, India
B. Madhusoodana Kurup
Affiliation:
School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Cochin, India
Alphi Korath
Affiliation:
School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Cochin, India
*
Author for correspondence: M. S. Sileesh, E-mail: [email protected]
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Abstract

We have estimated the length at maturity and length-weight relationships for five fish species inhabiting the deep-sea from the Andaman and Nicobar Islands off the Indian coast between 295–650 m deep in a trawl survey carried out in March–April 2017. Hauls were carried out by a high-speed Demersal Trawl Crustacean Version trawl net and analysis was performed for a total of 832 specimens. Length at first maturity of the five deep-sea fish species ranged from 14.28–105.73 cm while length at 90% maturity was in the range 17.87–159.83 cm. The length at maturity of the fish are Alepocephalus bicolor (male = 66.09, female = 105.73), Bathyclupea hoskynii (m = 15.14, f = 14.15), Chlorophthalmus corniger (m = 17.54, f = 15.31), Neoepinnula orientalis (m = 20.76, f = 16.76), and Neoscopelus microchir (m = 14.28, f = 15.40). The b value in the length-weight relationship ranged from 0.69–2.60, i.e. Alepocephalus bicolor (m = 1.93, f = 1.62), Bathyclupea hoskynii (m = 3.5, f = 1.66), Chlorophthalmus corniger (m = 2.07, f = 1.56), Neoepinnula orientalis (m = 2.86, f = 2.46) and Neoscopelus microchir (m = 0.89, f = 0.49). Based on these results, the b value showed an allometric relationship with length for all species studied, because these species have a similar morphometry, i.e. a flattened back. Since they are primary or secondary consumers at the bottom of consumer food webs, their roles are as predators of small–medium prey and as prey of top predators of food web chains.

Keywords

Deep-sea fishlength at maturitylength-weight relationshipNorth-eastern Indian Oceanreproductive biologyreproductive morphometry
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 4 , June 2020 , pp. 639 - 644
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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