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Development and spawning in captive oval squid Sepioteuthis sp. 1-akaika
Ist Teil von
Fisheries science, 2022-09, Vol.88 (5), p.531-538
Ort / Verlag
Tokyo: Springer Japan
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Eggs of
Sepioteuthis
sp. 1 were collected off Tanegashima Island and incubated at 19, 23, and 26 °C. Those eggs hatched after 42, 19, and 17 days, respectively. Development took less time at higher temperatures, and at 23 °C proceeded faster than reported for
S.
sp. 2 cultured at 25 °C. Paralarval
S.
sp. 1 were cultured at 23 °C, with one surviving female and male mated at approximately 175 days after hatching. About 204 days post-hatching, the female deposited eggs on artificial seagrass and cannibalized the male. Eggs were deposited five times from 29 to 80 days after mating, after which the female died. The number of eggs in egg sheaths (0–4) was lower than counts reported for egg masses in nature (mean 9 eggs). The terminal mantle length of the mature
S.
sp. 1 male was 169 mm, and of the female, 173 mm. In nature, individuals at mantle lengths below 250 mm are immature, suggesting that
S.
sp. 1 is downsized and precocious in captivity.