. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. a. 50 100 DAYS IN TANK 150 FIGURE 2(A). Growth curve of animals whose average initial weight was g (curve A). The average body weight of the group (n = 10) is plotted against days cultured in tanks. The animals were raised from young to sexually mature animals. The equation which best relates body weight (w) to time (t) in the holding tanks is: w = - + - X 10~V. This equation only holds for animals up to 200 g. Growth curve of animals whose average initial weight was 132 g (curve B). The average body w
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. a. 50 100 DAYS IN TANK 150 FIGURE 2(A). Growth curve of animals whose average initial weight was g (curve A). The average body weight of the group (n = 10) is plotted against days cultured in tanks. The animals were raised from young to sexually mature animals. The equation which best relates body weight (w) to time (t) in the holding tanks is: w = - + - X 10~V. This equation only holds for animals up to 200 g. Growth curve of animals whose average initial weight was 132 g (curve B). The average body weight of the group (n = 8) is plotted against days cultured in tanks. The animals were raised from sexually mature to old animals. The growth rate is comparable to those animals of curve A and Figure 2B whose weights exceed 100 g. The equation which best relates body weight (w) to time (t) in the holding tanks for mature animals is: w == 182 + This equation only holds for animals above 100 g. rate have not been observed. It is possible that seasonal effects disappear when animals acclimate to conditions in the holding tanks after two weeks. Organ weight in relation to body weight An allometric study was carried out between reproductive tract, radula, gill, and shell weights and body weight (Fig. 3). Body weight vs organ weight was plotted logarithmically, because allometric relationships obey the power law, , y = axb (von Bertalanffy, 1960; Jones, 1981). (The equations for the best fit line are given in Figure 4.) Minimal change of shell and radula weights was observed up to a body weight of 50 g. The organ weights of animals above 50 g increase with considerable scatter. At a given body weight the coefficient of variation is on the average 49 percent for shell weight and 26 percent for radula weight. The relationship of gill and reproductive tract weights to body weight also displays considerable scatter. At a given body weight the average coefficient of variation of
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
