Abstract
In P. hydrodromous, vitellogenesis is divided into two phases, Vitellogenesis I (V1, subdivided into Stages 1-3) and Vitellogenesis II (V2). The accelerated ovarian growth induced by bilateral eyestalk ablation during the first half of the breeding season apparently proceeded normally until Stage 3 of V1. Subsequently, the yolk showed signs of impoverishment, particularly in its total protein and lipid contents. In both gross morphology and biochemistry, the ovaries of eyestalkless crabs in V2 during the breeding season were closer to V2 ovaries of normal crabs than to V2 ovaries induced to develop in destalked crabs during the prebreeding season. The ovarian abnormality seen when eyestalk ablation occurs during the breeding season is not due to the unpreparedness of the oocyte population to begin vitellogenesis. In P. hydrodromous, the ovary, at all stages of its development except perhaps at late V2, seems to depend on eyestalks for the normal maintenance of vitellogenesis. P. hydrodromous females do not spawn if eggs artificially induced to form are not normal. Influence of the eyestalk on spawning is not directly via the nervous system; an eyestalk hormone controlling oviposition, if present, is released at least one week prior to spawning.
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