Temperature tolerance of loliginid squid (Loligo vulgaris Lamarck, 1798) eggs in controlled conditions

Temperature tolerance of common squid {Loligo vulgaris Lamarck, 1798) eggs in controlled conditions was investigated between May 21, 2002 and March 04, 2003. The treatments were performed as 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28°C at 37 ppt. Illumination was kept at dim light for 13-49 days before hatching. A mean dorsal mantle length of hatchlings was measured as 2.74 mm ±0.1 SD. In the trials, the eggs developed and hatched normally after 44-49 d at 12°C, 32-39 d at 14°C, 23-30 d at 16°C, 23-29 d at 18°C, 18-25 d at 20°C, 14-20 d at 22°C, and 13-19 d at 24°C, except at 6, 8, 10, 26, and 28°C. In the experiments, hatching rates and hatching success of the eggs ranged from 15.4 to 99.6% and from 9.3 to 98.5%, respectively, and significant differences were found between the treatments (x2, p<0.05).

Anahtar Kelimeler:

balık yumurtası, embriyonik gelişim, yumurtadan çıkmak, Loliginidae, sıcaklık

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