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对382条双齿围沙蚕的体长、头长、体重、体宽、刚节数等进行了测定分析。研究表明:体长与体重呈平方函数关系;体宽与体重成冥函数关系;刚节数在体长170 mm前的生长期内接近线性增长关系。双齿围沙蚕一般体长到190 mm即为成体体型,此后生长速度变慢,因而此时期为最佳捕捞期。由于环境因素差异,不同地区沙蚕的刚节数变化稍有差异。
The body length, head length, body weight, body width and the number of just segments of 382 bidentata were determined and analyzed. The results show that body length and body weight have a square function; body width and body weight have the same function; and the number of nodes just approached a linear growth within the growth period of 170 mm body length. Bisexual Nereis usually grows to 190 mm body length, then growth slows, so this period is the best fishing. Due to the difference of environmental factors, the difference in the number of just segments of Nereis in different areas changed slightly.