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Reproductive biology and sperm storage characters in two bobtail squid species (Cephalopoda: Sepiolidae)

Published online by Cambridge University Press:  01 March 2024

Noriyosi Sato Open the ORCID record for Noriyosi Sato [Opens in a new window] ,
Ryohei Tanabe ,
Takeru Uezu ,
Toshiki Matsuoka  and
Asuka Nakajima
Noriyosi Sato*
Affiliation:
Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka, JAPAN
Ryohei Tanabe
Affiliation:
Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka, JAPAN
Takeru Uezu
Affiliation:
Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka, JAPAN
Toshiki Matsuoka
Affiliation:
Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka, JAPAN
Asuka Nakajima
Affiliation:
Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka, JAPAN
*
Corresponding author: Noriyosi Sato; Email: norico3000@gmail.com
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Abstract

Bobtail squids (Family Sepiolidae) have a variety of sperm storage patterns, but their reproductive biology has not been studied in many species, especially those in Japanese waters. Two species, Austrorossia bipapillata (Subfamily Rossiinae) and Sepiolina nipponensis (Subfamily Heteroteuthinae) inhabit Suruga Bay in Japan. These were sampled approximately bimonthly by trawling at around 500 m between the end of September, 2020 and May, 2022. They were measured for body size (dorsal mantle length) and weighed for gonadosomatic index (GSI) calculation, and their sperm storage mechanism was investigated. The reproductive season occurs from May to October in A. bipapillata and from December to February in S. nipponensis. In both species, spermatangia were deposited inside the mantle cavity as implanted spermatangia. In A. bipapillata, 5.7 ± 6.5 spermatangia were deeply implanted in the opening of the oviduct, and in S. nipponensis 62.7 ± 61.5 spermatangia were attached to the left gill and surface of the connective-tissue capsule enclosing the digestive gland. The GSI was lower and there were fewer spermatophores stored in the spermatophoric sac of A. bipapillata males compared to S. nipponensis, leading us to suggest that it is exposed to weaker sperm competition than S. nipponensis, irrespective of similar sperm storage mechanism in the two species.

Keywords

Cephalopodreproductive strategyspermatophoresperm storage
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 104 , 2024 , e20
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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