Increased Densities Result in Reduced Weight Gain of Crayfish Orconectes virilis1

Journal of the World Aquaculture Society - Tập 26 Số 2 - Trang 165-171 - 1995
Paul B. Brown1, Keith Wilson1, James E. Wetzel1, Benjamin Hoene1
1Purdue University, Department of Forestry and Natural Resources, 1159 Forestry Building, West Lafayette, Indiana 47907–1159 USA

Tóm tắt

AbstractThree independent studies were conducted in which supplemental food was provided to juvenile Orconectes virilis reared at varying densities. One study was conducted in fiberglass tanks (densities of either 13, 27 or 54 individuals/m2) and two were conducted in outdoor pools (densities of either 2.5, 5, 10, 20 or 30 individuals/m2). Crayfish were offered a variety of foods ranging from a formulated diet to agricultural forages. Weight gain of crayfish fed a formulated diet and reared at varying densities was similar in the study conducted in tanks, but survival was significantly lower at the two highest densities (27 and 54/m2). Weight gain, survival and yield decreased as density increased in the studies conducted in outdoor pools. The highest weight gain and survival were at a density of 2.5/m2. Wheat straw was used as the source of nutrients. Use of formulated diets did not result in rapid weight gain when crayfish were reared at higher densities.

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Journal of the World Aquaculture Society

Tập 26 Số 2

165-171

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