Relationship between incubation days and rearing temperature of Octopus vulgaris eggs
1999
Sakaguchi, H. (Ehime-ken. Fisheries Experiment Station, Uwajima (Japan)) | Hamano, T. | Nakazono, A.
Relationship between the number of days required for hatching of Octopus vulgaris and the water temperature was examined in laboratory reared specimens from 1996 to 1998. The cumulative temperature was not suitable for estimating the incubation period, because the incubation period inversely varied with the rearing temperature. However, the effective cumulative temperature (day.degrees) showed good agreement. A regression formula for the relationship between the mean water temperature (X, degrees C) and the relative growth rate (Y) as the reciprocal of the incubating period: Y=0.0032X-0.0395, and 11.9 degrees C was estimated as the critical lower temperature for embryonic development. The mean effective cumulative temperature was 299.4 days.degrees C
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