Effects of low salinity on embryonic development and hatching of the squid, Loligo bleekeri (Cephalopoda: Loliginidae)
2004
Ito, K. (Aomori-ken. Fisheries Experiment Station, Ajigasawa (Japan)) | Sakurai, Y.
Abstract: We examined the effects of low salinity on the embryonic development and hatching of the squid Loligo bleekeri (Cephalopoda: Loliginidae) . Egg capsules were incubated in seawater with salinity ranging from 20.4 to 34.6 psu at 9 deg C and 15 deg C. The duration of embryonic development increased slightly at low salinities. The hatching rate decreased markedly below 50% between 27.2 and 28.8 psu at 9 deg C, and between 25.4 and 27.2 at 15 deg C. Hatching did not occur for embryos kept at 23.8 psu, 9 deg C, or for those kept at 20.8 psu, 15 deg C. During the embryonic development, all embryos exposed temporally (8 days, 18 days) to low salinity (21 psu) seawater died.
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