Abstract
During late February to mid-March, 1991, when matureN. japonica swarmed in the sea surface off Jimo County, Qingdao, seawater containing numerous early embryos was pumped into a nearby 2.7 ha. muddysand shrimp pond, where the embryos continued to develop. 800000Penaeus chinensis seedlings were introduced into the pond on May 30, 1991. Monthly benthic samplings were carried out to determine the population dynamics and production ofN. japonica in this atypical environment.
The density ofN. japonica varied from 0 to 20 400 ind./m2. The predation ofP. chinensis was considered to be responsible for the mass mortality ofN. japonica in June through July, when the worms were 2.2–3.3cm in length and lived in the top 2–4cm sediment. From August to September of 1991, the hottest period in the site, there was no substantial mortality ofN. japonica as reported in earlier literature. This was explained by the deeper burrowing of the worms that protected them from predation by shrimps.
Monthly biomass ranged from 45.2 to 385.3 g/m2, with a mean of 187.7 g/m2. Production of May. 1991 through March, 1992 was 1071.4 g/m2, with aP/B ratio of 5.7.
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Jianwen, Q., Baoling, W. Population dynamics and production ofNeanthes japonica (Izuka) in a shrimp pond. Chin. J. Ocean. Limnol. 11, 360–367 (1993). https://doi.org/10.1007/BF02850641
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DOI: https://doi.org/10.1007/BF02850641