Journal of Dalian Ocean University  2023, Vol. 38 Issue (5): 804-811 DOI: 10.16535/j.cnki.dlhyxb.2022-361 |
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| Effects of sediment type and shell length on burrowing behavior and feeding rate of razor clam (Sinonovacula constricta) |
| ZHANG Shuyuan，WANG Xinxing，LIU Qi，LI Yifeng，SHEN Heding，NIU Donghong *
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1.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources，Ministry of Education，Shanghai Ocean University，Shanghai 201306，China；2.Aquatic Technology Promotion Station of Sanmen County，Taizhou 317100，China；3.Shanghai Collaborative Innovation Centre for Aquatic Animal Genetics and Breeding，Shanghai Ocean University，Shanghai 201306，China
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Abstract In order to investigate the sediment selection and feeding differences of razor clam (Sinonovacula constricta) after burrowinging, different sizes of razor clam with shell lengths of 2.5, 3.0, and 3.5 cm were used as experimental objects to study the effects of different sediment types (total mud, 1/3 sand, 2/3 sand, total sand) and sediment thickness (6, 12, 18, 24, and 30 cm) on burrowing behavior and feeding rate. The results showed that the size and sediment type had a very significant interactive effect on the burrowing rate and time (P<0.01), with 100% of burrowing rate only within 24 hours in total mud sediment. The burrowing behavior of razor clam was obviously blocked at the sediment containing over 30% of sand, with significant difference in the half shell vertical time (TE50) between different sizes (P<0.05). There was no significant interaction of clam shell sizes and sediment thickness on the burrowing rate, burrowing time and feeding rate (P>0.05), with significant positive correlation between individual size and burrowing depth and feeding rate (P<0.05). The razor clam with a shell length of 3.5 cm had burrowing depth at about 2/3 of the sediment thickness, and as high 2.12 times feeding rate as that the individuals in a thickness of 6 cm did, under a sediment thickness of 6 cm, with the maximal feeding rate of razor clam with a shell length of 2.5 cm. In conclusion, the suitable sediment for burrowing of razor clam is muddy, with strong burrowing ability in small sizes. The thicker the sediment is, the more conducive to feeding after burrowing is.
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Published: 08 November 2023
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