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Life history aspects of two species of the Squalus genus in the Eastern Ionian Sea

Published online by Cambridge University Press:  09 January 2017

Aikaterini Anastasopoulou ,
Chryssi Mytilineou ,
Panayiota Makantasi ,
Christopher J. Smith ,
Stefanos Kavadas ,
Eugenia Lefkaditou  and
Konstantia N. Papadopoulou
Aikaterini Anastasopoulou*
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece
Chryssi Mytilineou
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece
Panayiota Makantasi
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece
Christopher J. Smith
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Crete, Greece
Stefanos Kavadas
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece
Eugenia Lefkaditou
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece
Konstantia N. Papadopoulou
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Crete, Greece
*
Correspondence should be addressed to: A. Anastasopoulou, Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Athens, Greece Email: kanast@hcmr.gr
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Abstract

Data on life history aspects of two species of Squalus genus were collated from five different studies carried out in the Eastern Ionian Sea from 1995 to 2014. Data were collected from 948 longnose spurdogs Squalus blainville (Risso, 1827) and 65 spiny dogfish Squalus acanthias Linnaeus, 1758 caught by trawl and longlines. The mean length of both species increased with depth. Sexual segregation was observed for S. blainville, whereas a segregation of immature and mature individuals was detected for S. acanthias. The length–weight relationship for S. blainville indicated positive allometry (b > 3) for both sexes, whereas a negative allometry (b < 3) was found for S. acanthias for the combined sexes. The sex ratio of both species was in favour of males. For S. blainville, the gonadosomatic and hepatosomatic indices differed significantly between sexes but not between seasons with the maturity data supporting the hypothesis of continuous reproduction throughout the year. Length at first maturity (L50) for female and male S. blainville was 603 and 413 mm respectively. For S. acanthias, males collected in autumn had finished their spawning activity; the single specimen caught in summer was reproductively active. Females, caught only in summer, were all gravid. Prey identified in the stomachs of S. blainville belonged to three major groups: fish, cephalopods and shrimps. Other groups such as echinoderms and ascidians were also found. Identified prey in the stomachs of S. acanthias belonged to two main groups, fish and cephalopods, although other groups (including echinoderms and polychaetes) were also present.

Keywords

Squalus blainvilleSqualus acanthiaselasmobranchsdietlife historyMediterranean Sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 98 , Issue 4 , June 2018 , pp. 937 - 948
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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