Effect of salinity on hatching and survival of big fin squid, Sepioteuthis lessoniana Lesson, and Pharaoh cuttlefish, Sepia pharaonis Ehrenberg
1996
Jaruwat Nabhitabhata | Sabaithip Amornjaruchit (Chachoengsao Coastal Aquaculture Development Center (Thailand))
Eight levels of salinity caused the hatching of big fin squid eggs and pharaoh cuttlefish eggs to be different with high significance (P0.01). Highest percentage of hatching was at 32 ppt and more than 80 percent at 24 and 28 ppt with 36 ppt for the cuttlefish eggs. Eggs of big fin squid could not hatch at 16 and 40 ppt and eggs of the cuttlefish could not hatch at 16, 20, 40 and 44 ppt. Optimum salinity range for hatching was estimated to be 21.8-36.6 ppt for big fin squid and 22.5-37.5 ppt for pharaoh cuttlefish. Salinity out of optimum range tended to cause death and abnormal development of embryos and premature hatching. Survival of hatchings of the two species was significantly different after brief change of salinity to eight levels in 24 hrs. Highest survival was at 32 ppt and 28 ppt for big fin squid, at 32, 28 as well as 36 ppt for the cuttlefish with more than 80 percent at 24 ppt. Optimum salinity range for survival was 23.2-35.5 ppt for big fin squid and 21.4-39.4 ppt for pharaoh cuttlefish.
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