農業部水產試驗所全球資訊網

牙鮃 (Paralichthys olivaceus) 屬於溫帶物種，本研究旨在了解本魚種於亞熱帶國家之飼料營養需求，同時探討飼料之油脂含量對其肉質之影響。試驗結果顯示，初始體重為173.4 ± 1.9 g之牙鮃，飼料中最低蛋白質添加量為52.8 %；初始體重為334.5 ± 9.2 g之牙鮃，飼料中最低脂質添加量為15.7 %。探討飼料中添加不同含量脂質對牙鮃成長及肉質之影響，以初始體重1048.0 ± 24.9 g之牙鮃進行試驗，投餵8週後取魚肉進行分析，眼側部分，其生魚肉硬度會隨著飼料中油脂含量上升而提高，但是經煮熟後蛋白質變性，質地則相反；彈性部分，魚肉經煮熟後彈性會隨著飼料中油脂含量上升而彈性增加。盲側部分，其硬度趨勢與眼側魚肉相同，生魚肉之彈性則是以油脂含量15%組別最高。

摘要abstract(英) Paralichthys olivaceus is a temperate fish species. Using polynomial regression, we investigated the impact of the dietary protein and lipid content on the flesh quality of Paralichthys olivaceus to understand the nutritional requirements of the fish for cultivation in subtropical countries. The optimal protein content in the feed was 52.8% for an initial fish weight of 173.4 ± 1.9 g in the first trial. The optimal lipid supplementation in the feed was 15.7% for an initial fish weight of 334.5 ± 9.2 g in the second trial. In the third trial, Paralichthys olivaceus with an initial average weight of 1048.0 ± 24.9 g were used to investigate the effects of different dietary lipid contents administered for 8 weeks on their growth performance and flesh quality. The analysis of the fish’s eyed side muscle revealed that the hardness of the flesh increased with an increase in the lipid content of the feed. However, when the flesh was cooked, protein denaturation resulted in the opposite effect. Moreover, the cooked fish flesh showed an increase in elasticity with an increase in the lipid content of the feed. The hardness trend of the fish’s blind side muscle mirrored that of the eyed side muscle. In addition, raw flesh from fish administered a feed with 15% lipid exhibited the highest elasticity.