Nutritional status of a nereidid polychaete cultured in sand filters of mariculture wastewater

摘要

This study examined the nutritional composition of the intertidal marine polychaete Perinereis helleri (Nereididae)when artificially cultured in sand filters treating mariculture wastewater. Moisture levels in harvested P. helleri ranged from 758 to 855 g kg1, and ash, from 23 to 61 g kg1 wet matter (WM). Stocking density and graded size after harvest significantly affected their composition. Higher total lipid contents were found in large (>0.6 g) P. helleri(16–19 g kg1 WM) and those grown at the lowest density(1000 m2: 18 g kg 1 WM) than in small (≤0.6 g) onesud(14 g kg1 WM) and those grown at the highest densitiesud(4000–6000 m2: 13–16 g kg1 WM). Several fatty acids within a very broad profile (some 30 identified) reflected this pattern, yet their ARA/EPA/DHA ratios were relativelyudunaffected. Feeding the polychaete-assisted sand filtersud(PASF) with fish meal to increase worm biomass productivityudsignificantly increased their DHA content. Other components (e.g. protein, phospholipids, cholesterol, carbohydrate,udamino acids, nitrogen, minerals and bromophenols) andudnutritional factors (e.g. maturity, feeding seaweed and endemic shrimp viral content) were also investigated. Results suggest that PASF-produced P. helleri have a well-balanced nutritional profile for penaeid shrimp and fish broodstock.