In order to study the effects of different feeding models and feeding ways on growth, gonad development ofS.intermedius , the growth targets and gonad traits ofS.intermedius were measured and analyzed in the experiment under different feeding models (M1: kelp, M2: kelp mussel, M3: pumpkin, M4: carrot) and different feeding ways (RM1: feed kelp after feeding pumpkin for 75 days, RM2: feed kelp after feeding carrot for 75 days). The results showed that on conditions of the different feeding models, there’s no significant difference between M1(57.84±3.25) mm, (72.58±11.07) g and M2 (56.60±2.66) mm, (69.62±8.94) g on test diameter and
weight of sea urchin(P >0.05), both of them were significantly different with M3 (53.10±2.28) mm, (57.31±8.18) g and M4(50.12±1.70) mm, (50.45±4.27) g models (P <0.01); the GI of M2(♀ :31.22±3.31)%, (♂:30.92±2.76)% model was significantly higher than the other three models (P <0.01); the light orange-yellow ΔE1 and lightyellow
ΔE 2 of femaleS.intermedius under M2 model were significantly better(P <0.05) than control group(M1 model), which was not significantly different with control group in male S.intermedius (P >0.05). The results suggested that: the bait added with animal protein has obvious promoting effects on the gonad index and the quality of the gonad (P <0.05). On conditions of the different feeding ways, the test diameter of control group (57.84 ± 3.25)mm was significantly higher than RM1 (55.46 ± 2.19) mm model, and there’s no significant difference (P >0.05) between RM1 (68.63±7.39) g model and control group(72.58±11.07)g on weight, the growth rate of diameter (12.55±0.22)%, (12.68±1.78)% and weight (29.60±4.20)%, (30.53±2.09)% under RM1 and RM2 models were significantly higher (P <0.05)than control group (9.79±0.97)%, (19.86±4.86)% during 75 days to 150day. There’s no significant difference (P >0.05)with the GI in different gender and feeding ways. There’s no significant difference in ΔE 1 and ΔE 2 of RM1 and RM2 models (P >0.05), both of them were significantly better (P <0.05) than control group. The results suggested that: the feeding ways of feed kelp after feeding pumpkin for 75days could not significantly affect the weight of sea urchin, but also had obvious promoting effects on the gonad index and the quality of the gonad. This experiment aims to find suitable feeding models and feeding ways which can improve the growth and gonad quality of S. intermedius and provide certain reference for the selections of feeding models and feeding ways in the link of sea urchin cultivation.
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