Contribution of Exogenous Sedimented Particulate Organic Matter to Sea Cucumber Ponds under Different Management Modes
WANG Yulong1, ZHANG Jinyuan2, YANG Shen3, LI Lezhou1, YANG Gengjie1, LEI Zhaolin1, ZHOU Wei1
1. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China; 2. Haikui Environmental Monitoring Science and Technology Co., Ltd, Dalian 116000, China; 3. Shanghai YIS Communication Technology Co., Ltd, Shanghai 201210, China
Abstract：Sedimented particulate organic matter is an important sea cucumber feed source. To understand the effect of different management modes on the proportion of exogenous sedimented particulate organic matter in sea cucumber ponds, a natural tidal pond, a microporous aeration pond, and a water quality regulator pond were selected as subjects in the study and the period from March to September was divided into the growth and dormancy stages of sea cucumber according to water temperature. The contribution of the exogenous sedimented particulate organic matter was calculated in different ponds by collecting sediments, suspended and sedimented particles in the ponds and sedimented particles in tidewater using the carbon-nitrogen mass balance equation of stable isotope techniques. The source of the sedimented particulate organic matter was roughly identified based on the C/N (TOC/TN) ratio. The results showed that the sedimented particulate organic matter in the experimental ponds was primarily derived from algae, and the contribution of the endogenous sedimented particulate organic matter was increased in all ponds. The water quality regulator pond showed the minimal average contribution (81.01%), whereas there was the maximal average contribution (84.48%) in the natural tidal pond. Combining the plankton biomass and nutrient content in the three ponds during the experiment, it was found that the material circulation was more rapidly in the water in the regulator farm pond than that in the other two ponds. The findings show that the material circulation rate in the water quality regulator pond is the highest, which is beneficial to naturally increase the biological food in the pond and to maintain a better breeding environment.
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2022, Vol. 41 
