Evaluation of reproductive performances of the common octopus ( Octopus vulgaris ) reared in water recirculation systems and fed different diets

摘要

The reproductive performance of Octopus vulgaris broodstocks fed two different diets (mixed fish [F group, BW 1,048.14?g] or mixed crustaceans [C group, BW 998.44?g]) was analyzed using an experimental recirculating aquaculture system consisting of a tank equipped with spawning and incubation chambers. A total of 8 females (F1–4; C1–4), and 8 males (M1–M8) were selected. DI of the C group females was significantly (p??0.05) higher (3.0?±?0.29%) than the F group (2.16?±?0.67%). SGR in C group was significantly higher (1.43?±?0.12%) than the F group (1.18?±?0.25%). Egg clusters, number of clusters, number of clusters/kg BW, and total length were more favorable in the C group than the F group. The number of clusters/kg BW of C females was 2.5 times higher than that of F females (78.1?±?6.5 vs 31.1?±?13.3). The total eggs number, number of eggs/cm, number of eggs/kg BW in the C group were significantly (p??0.05) higher compared with the F group; the number of eggs/kg BW and paralarvae/kg BW were 5 times higher in the C group (115,928?±?12,513 C vs 22,109?±?7912 F and 114,953?±?12,591 vs 20,729?±?7104, respectively). Hatching rate of the C group was significantly (p??0.05) higher compared to the F group.