抄録
The volume of the stomach (cardiac chamber) of the Japanese spiny lobster was measured by means of a gravimetric method using emery. The method is as follows:-
V=S/S1,
where V is volume (cc) of the stomach, S is the total weight (g) of emery put into stomach, and S1 is the weight (g) of emery of 1 cc. The emery was let into stomach with water by a filler. The same method was used when the emery is taken out the emery from the stomach, and the emery was dried out by an evaporator for weighing. For the purpose of this study, always raw stomachs were used, as they distended well by putting emery into them (Fig. 1, A), but ones fixed by formalin or alcohol were not available for the present investigation, because they did not swell successfully by putting it into them (Fig. 1, B). The particles of the emery employed for this study measures 0.2×0.3-0.5×0.8mm in size.
The result obtained is given in the Table 1. The relationship (Fig. 2) between body-length (L), from posterior margin of orbit to distal rim of telson, and stomach volume (V) is expressed by an exponential formula, V=0.000795L2.995, and that (Fig. 3) between V and body-weight (W) of the lobster is shown by the following formula, V=0.0184W+0.0538.
