農業部水產試驗所全球資訊網

密點少棘胡椒鯛 (Diagramma pictum) 廣泛分布於印度-西太平洋地區，是漁業、遊釣和水族貿易的重要物種，有發展水產養殖與增殖放流的潛力。在水產養殖環境中，光照強度、水中微藻的濃度及育苗初始受精卵的投放密度都會影響受精卵孵化及後續魚苗培育的成敗。本研究分別探討密點少棘胡椒鯛受精卵在不同光照強度 (0、1,000、4,500及20,000 lux)、微藻濃度 (6.38 X 10⁵、1.68 X 10⁶、3.35 X 10⁶及4.86 X 10⁶ cells/mL) 及放卵密度 (250、500、1,000及2,000粒/L) 條件下，經過24 hr的孵化率及孵化後仔魚的畸形率。結果顯示，光照強度提高，剛孵化仔魚畸形率顯著增加，而微藻濃度及放卵密度提高都會導致孵化率降低及畸形率提高。建議密點少棘胡椒鯛育苗時最初的24 hr維持環境條件如下：光照強度0–1,000 lux、微藻濃度6.38 X 10⁵ cells/m1及放卵密度250粒/L，可獲得的孵化率分別為44–54%、78.89%及74.48%，孵化後仔魚畸形率分別為11–17%、5.52%及15.82%。本研究結果可應用於密點少棘胡椒鯛的受精卵孵化管理，有助於提升後續魚苗生產之活存率。
 

摘要abstract(英) The painted sweetlips (Diagramma pictum), widely distributed in the Indo-West Pacific region, is an important species for fisheries, fish stocking, and the aquarium trade, and has potential for aquaculture development and stock enhancement. In aquaculture environments, light intensity, microalgae concentration in water, and the initial stocking density of fertilized eggs affect the hatching success and subsequent larval rearing outcomes. This study investigates the hatching rate and deformity rate of larvae after 24 hours under varying light intensities (0, 1,000, 4,500, and 20,000 lux), microalgae concentration (6.38×105, 1.68×106, 3.35×106 and 4.86×106 cells/mL), and egg stocking densities (250, 500, 1,000, and 2,000 eggs/L). Results show that increased light intensity significantly increases larval deformity rates, while higher microalgae concentration and egg stocking densities lead to reduced hatching rates and increased deformity rates. We recommend that the following environmental conditions should be maintained during the initial 24 hours of D. pictum larval rearing: light intensity at 0-1,000 lux, microalgae concentration at 6.38×105 cells/mL, and egg stocking density at 250 eggs/L. Under these conditions, the respective hatching rates are 44-54, 78.89 and 74.48%, and the respective larval deformity rates are 11-17, 5.52 and 15.82%. The results of this study can be applied to the hatching management of fertilized eggs in D. pictum and contribute to improving the survival rate of subsequent larval production.