Journal of Dalian Ocean University  2023, Vol. 38 Issue (4): 637-644    DOI: 10.16535/j.cnki.dlhyxb.2022-362
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Regularity of feeding acoustic signals by Pacific whiteleg shrimp (Litopenaeus vannamei) with different body length
CAO Zhengliang，WANG Xiuxiu，LI Zhaocheng，SHEN Mengting，HU Qingsong，WU Di*
A feeding acoustic trial was conducted to probe whether there were regularity and difference of the sound signals by Pacific whiteleg shrimp (Litopenaeus vannamei) with different body length of 2-3, 4-5, 6-7, 8-9, and 9-10 cm when the shrimp fed pellets and shrimp shell. Three individuals of the shrimp was placed in an acoustic test glass tank (44 cm×28 cm×30 cm) equipped with DJI underwater cameras and sound acquisition equipment consisting of an SM4 type sound recorder with a HTI-96-Min, and fed formulated diet with particle size of 1.2 mm and shrimp shell. With passive acoustic monitoring, two kinds of acoustic signals by pellets and shrimp shell from Pacific whiteleg shrimp feeding were recorded under laboratory conditions. The results showed that the peak frequency was different when different body length of Pacific whiteleg shrimp feeding pellets, with the maximum frequency about 25 kHz in small shrimp with body length of 2-3 cm, and the minimum frequency about 7 kHz in large shrimp with body length of 9-10 cm. The peak frequency was shown to be decreased with increase in the shrimp body length, which was consistent with the change in frequency range. The duration of a single pulse signal (maximum about 18 ms in the shrimp with body length of 9-10 cm, and minimum about 7 ms in the shrimp with body length of 2-3 cm) was found to be increased with the increase in shrimp body length.The duration of a single pulse signal (maximum about 13 ms in the shrimp with body length of 9-10 cm, and minimum about 6 ms in the shrimp with body length of 2-3 cm) was found to be increased with the increase in shrimp body length when different body length shrimp fed shrimp shell. The peak frequency and frequency range were related to the shrimp body length, without significant linear regularity by shrimp shell. The findings indicated that there were different in the feeding acoustic signal characteristics of Pacific whiteleg shrimp with different body length, with some regularity by pellets, without regularity by shrimp shell.