Relating abundance of purpleback flying squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) to environmental parameters using GIS and GAM in south-eastern Arabian Sea

Mohamed, K S and Sajikumar, K K and Ragesh, N and Ambrose, T V and Jayasankar, J and Koya, K P Said and Sasikumar, Geetha (2018) Relating abundance of purpleback flying squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) to environmental parameters using GIS and GAM in south-eastern Arabian Sea. Journal of Natural History, 52 (29-30). pp. 1869-1882.

Text KS Mohamed_KK Sajikumar_2018_Journal of Natural History_Relating abundance of purpleback flying squid Sthenoteuthis oualaniensis Cephalopoda Ommastrephidae to environmental parameters using GIS and GAM.pdf Restricted to Registered users only Download (2MB) | Please mail the copy request to cmfrilibrary@gmail.com

Abstract

The distribution pattern of purpleback flying squid and the relationship between its abundance and environmental variables in the south-eastern Arabian Sea were analysed using a geographical information system (GIS) and a generalised additive model (GAM). Highest abundances were observed during December and January within 10 and 13°N and 71 and 72°E around the Lakshadweep Islands. The mean abundance in the area was 4.21 tonnes/km2 and the maximum sustainable yield (MSY) was estimated as 0.63 million tonnes. GAM indicated that very high squid abundance was associated with low values of dissolved oxygen (6.01–6.27 mg/L), sea surface temperature (28.03–28.62°C), pH (7.75–8.56), salinity (30.42–34.48 psu), chlorophyll-a (0.4–0.6 mg/m3), zooplankton biomass (0.23–0.64 mL/m3), and shallow 20°C isotherm (101.2–134.7 m) and mixed layer depth (17.8–29.8 m). As a carnivore from paralarval stages, S. oualaniensis depends on secondary and tertiary production to sustain its population for which primary production is used up. In the tropical Arabian Sea where temperature differences are not so pronounced, S. oualaniensis distribution was found to be related to a low but very narrow sea surface temperature (SST) band. There is sufficient fishable biomass in the area to possibly launch a new targeted oceanic squid fishery from the western seaboard of India.

Item Type:	Article
Uncontrolled Keywords:	Sthenoteuthis oualaniensis; Arabian Sea; GIS; GAM; abundance; Indian EEZ
Subjects:	Molluscan Fisheries > Cephalopods
Divisions:	CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division
Depositing User:	Arun Surendran
Date Deposited:	02 Aug 2018 05:53
Last Modified:	17 Feb 2023 11:01
URI:	http://eprints.cmfri.org.in/id/eprint/12983

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