池塘循环流水养殖模式对罗非鱼不同部位肌肉品质的影响

Effects of in-pond raceway system culture mode on muscle quality at different sites of tilapia

  • 摘要: 【目的】为探究罗非鱼在池塘循环流水养殖(In-pond raceway system,IPRS)模式下其肌肉各营养指标的变化,明确该养殖模式对罗非鱼肌肉品质的影响,为池塘循环流水养殖模式的推广及开展高品质罗非鱼养殖提供科学依据。【方法】以IPRS养殖的罗非鱼为试验组,传统池塘养殖(Traditional pond aquaculture,TPA)罗非鱼为对照组,对2种养殖模式下罗非鱼背肌、腹肌和尾肌的营养指标及背肌的质构特性和肌纤维特性进行测定分析。【结果】IPRS组罗非鱼腹肌粗蛋白(19.62%)和背肌粗脂肪(3.30%)含量最高,IPRS组和TPA组背肌中粗脂肪含量差异显著(P<0.05,下同);在IPRS组和TPA组各部位肌肉中均检测出16种氨基酸,必需氨基酸总量、鲜味氨基酸总量及16种氨基酸总量在IPRS组背肌中最高(7.41%、7.22%和18.41%),在TPA尾肌中最低(6.09%、5.89%和15.20%);IPRS组和TPA组4种鲜味氨基酸中谷氨酸和天冬氨酸含量分别排第1和第2,含量最高在IPRS组背肌(3.11%和2.05%);IPRS组腹肌饱和脂肪酸总量显著降低,不同部位肌肉的多不饱和脂肪酸总量均极显著提高(P<0.01),多不饱和脂肪酸总量在IPRS组尾肌最高(31.53%),在TPA组背肌最低(27.99%)。IPRS组罗非鱼硬度、弹性、咀嚼性和回复性等肌肉质构特性相对于TPA组分别提高24.89%、18.19%、61.40%和33.63%;且IPRS组肌纤维直径更小、密度更大。【结论】池塘循环流水养殖罗非鱼的肌肉品质与营养价值相比于传统池塘养殖罗非鱼更具优势。

     

    Abstract: 【Objective】The purpose of this study was to investigate the changes of various nutrient indicators of tilapia muscles under the in-pond raceway system(IPRS) culture mode,to clarify the effects of IPRS culture mode on muscle quality of tilapia, and to provide scientific basis for promoting IPRS culture modeand developing high quality tilapia culture. 【Method】IPRS-cultured tilapia were used as the experimental group and traditional pond aquaculture(TPA) tilapia were used as the control group. The nutrient indicators of the back, abdomen and tail muscles of tilapia, as well as the texture characteristics of the back muscles and the muscle fiber characteristics of tilapia under two culture modes were measured and analyzed. 【Result】The IPRS group had the highest crude protein content(19.62%) of abdomen muscle and the highest crude fat content(3.30%) of back muscle, and the difference in crude fat content in back muscle between IPRS and TPA groups was significant(P<0.05, the same below). Sixteen kinds of amino acids were detected at all sites in muscles of IPRS group and TPA group. The amino acid content of essential amino acids,delicious amino acids and total 16 amino acids were the highest in the back muscle of the IPRS group(7.41%, 7.22% and 18.41%) and lowest in the tail muscle of TPA(6.09%,5.89% and 15.20%). The contents of glutamic acid and aspartic acid among the four delicious amino acids in both IPRS and TPA groups ranked the first and second respectively,with the highest content being in the back muscle of the IPRS group(3.11% and 2.05%). The total amount of saturated fatty acids in the abdomen muscle was significantly lower in the IPRS group,and the total amounts of polyunsaturated fatty acids at different sites in muscles were increased extremely significantly(P<0.01). The total polyunsaturated fatty acids were the highest in the tail muscles of the IPRS group(31.53%) and the lowest in the back muscles of the TPA group(27.99%). Compared with the TPA group, muscle texture characteristics such as hardness, elasticity,chewiness and resilience of tilapia in the IPRS group increased by 24.89%, 18.19%,61.40% and 33.63% respectively. The muscle fibers of tilapia in IPRS group were smaller in diameter and denser than those in TPA group. 【Conclusion】The muscle quality and nutrition of tilapia cultured under inpond raceway system are more advantageous than those of tilapia in traditional pond aquaculture.

     

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