Dummy Egg Production by Female Cardinalfish to Deceive Cannibalistic Males: Oogenesis without Vitellogenesis |
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Authors: | Gen Kume Atsuko Yamaguchi Ichiro Aoki |
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Institution: | (1) Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657, Japan;(2) Present address: Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki, 852-8521, Japan |
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Abstract: | Filial cannibalism occurs in a variety of taxa, especially in fish exhibit paternal care. In the Apogonidae, males mouthbrood a cohesive mass of eggs received from a single female, although the males frequently eat the entire brood. It has been recognized that a primary factor concerning entire brood cannibalism is the brood size produced by females, as the parent eats a small egg mass so long as the reproductive return does not exceed the cost of providing care. In Apogon lineatus, approximately 18% of each brood was occupied by abnormal eggs lacking yolk, which were hydrated without the vitellogenesis phase and eventually ovulated with other normal eggs as a single egg mass. By not providing yolk to some eggs within the brood, A. lineatus females may succeed in producing an apparently large brood, reducing the likelihood of entire brood cannibalism by males. |
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Keywords: | filial cannibalism oocyte hydration paternal mouthbrooder Apogonidae |
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