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Environmental Biology of Fishes

, Volume 2, Issue 2, pp 147–176 | Cite as

Early ontogeny of Labeotropbeus Ahl, 1927 (Mbuna, Cichlidae, Lake Malawi), with a discussion on advanced protective styles in fish reproduction and development

  • Eugene K. Balon
Article

Synopsis

With yolk as a food source, development of Labeotropheus takes place in the buccal pouch of the female until such time as juveniles are formed. Hatching from the vitelline membrane occurs early, after 6 days of incubation, and the eleutheroembryo develops without metamorphic stages directly into a juvenile, forming advanced structures like fins, skeleton and pigments, at a time when a large yolksac is still present. A strong circulatory network on the yolk and anal fin fold, and a yellow carotenoid pigment provide the oxygen supply within the closely packed buccal pouch. A relatively large self-sufficient juvenile, 14% of the adult fish size, is released from the mother's mouth 31 days after fertilization. The evolution of advanced hiding styles in reproductive guilds of fishes is discussed and ends with a speculation that the Latimeria, having had more geological time to refine its hiding style, releases fully developed young, 25 to 30% the size of the adult fish. The advanced style of hiding eggs is accompanied not only with fewer, larger eggs, but also by a successive increase in yolk density in terms of nutrients and respiratory pigments; these in effect determine the size of the released juvenile.

Keywords

Embryology Development Embryonic respiration Carotenoids in respiration Evolution Egg hiding Mouth brooder Young size Cichlids Mouth fertilization Size on release Latimeria 

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Copyright information

© Dr. W. Junk bv Publishers 1977

Authors and Affiliations

  • Eugene K. Balon
    • 1
  1. 1.Department of Zoology, College of Biological ScienceUniversity of GuelphGuelphCanada

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