Mesa M G, Rose B P
U. S. Geological Survey, Western Fisheries Research Center, Columbia River Research Laboratory, 5501 Cook-Underwood Rd, Cook, WA, 98605, U.S.A.
J Fish Biol. 2015 Feb;86(2):755-764. doi: 10.1111/jfb.12600. Epub 2014 Dec 26.
The effectiveness of several non-lethal techniques as indicators of total lipid content in smallmouth bass Micropterus dolomieu, walleye Sander vitreus and channel catfish Ictalurus punctatus was investigated. The techniques included (1) the Fulton and relative condition factors, (2) relative mass, (3) plasma indicators of nutritional status (alkaline phosphatase, calcium, cholesterol, protein, triglycerides and glucose) and (4) readings from a hand-held, microwave energy meter. Although simple linear regression analysis showed that lipid content was significantly correlated with several predictor variables in each species, the r values for the relations ranged from 0·17 to 0·50 and no single approach was consistent for all species. Only one model, between energy-meter readings and lipid content in I. punctatus, had an r value (0·83) high enough to justify using it as a predictive tool. Results indicate that no single variable was an accurate and reliable indicator of whole body lipid content in these fishes, except the energy meter for I. punctatus.
研究了几种非致死技术作为小口黑鲈（Micropterus dolomieu）、大眼狮鲈（Sander vitreus）和斑点叉尾鮰（Ictalurus punctatus）总脂质含量指标的有效性。这些技术包括：（1）富尔顿和相对条件因子；（2）相对体重；（3）营养状况的血浆指标（碱性磷酸酶、钙、胆固醇、蛋白质、甘油三酯和葡萄糖）；（4）手持式微波能量计的读数。尽管简单线性回归分析表明，脂质含量与每个物种的几个预测变量显著相关，但这些关系的r值范围为0.17至0.50，且没有一种方法对所有物种都是一致的。只有一个模型，即斑点叉尾鮰能量计读数与脂质含量之间的模型，其r值（0.83）足够高，足以证明将其用作预测工具是合理的。结果表明，除了斑点叉尾鮰的能量计外，没有单一变量是这些鱼类全身脂质含量的准确可靠指标。
