Characterisation of an individual of the giant form of the purpleback flying squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastriphidae) in the Arabian Sea and its biological descriptors

Autor:	K. T. Sadanandan Sunil, Kurichithara K. Sajikumar, Geetha Sasikumar, N. S. Jeena, T M Najmudeen, N Ragesh, Summaya Rahuman, Kolliyil S. Mohamed
Rok vydání:	2021
Předmět:	Squid Anisakis simplex Cannibalism Zoology Biology Fecundity Genetic divergence biology.animal Sthenoteuthis oualaniensis Phyllobothrium Genetics Animal Science and Zoology Mantle (mollusc) Ecology Evolution Behavior and Systematics
Zdroj:	Molluscan Research. 41:275-284
ISSN:	1448-6067 1323-5818
Popis:	This paper describes a mated female of the giant form of purpleback flying squid Sthenoteuthis oualaniensis (545 mm dorsal mantle length and 5.46 kg body weight) caught in the Arabian Sea, with biological, morphological, and molecular descriptors. Based on the growth increments within statoliths, its age was found to be 203 days with a high growth rate of 2.68 mm DML/day. Its diet contained squids (72.3%) and fish (27.3%) with a high degree (70%) of cannibalism. The total fecundity of the individual was estimated as 702,240 eggs. Three species of parasites were found, two species of Platyhelminthes from the mantle cavity (Phyllobothrium sp. and Nybelinia sp.) and one of Nematoda from the stomach (Anisakis simplex). The COI barcode confirmed the identity of the giant form as S. oualaniensis, and the high genetic divergence (6.18–9.35%) that was observed between the current specimen and other forms from various oceans points to the probability that it might be a genetically distinct lineage from the northern Indian Ocean. The present record forms the southernmost (10°05′ N) record of the giant form of this flying squid.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d8567108c37e870f369bac96b0821c1d https://doi.org/10.1080/13235818.2021.2003513 Zobrazit plný text záznamu