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lemon shark. Some viviparous fish exhibit oophagy, in which the developing embryos eat other eggs produced by the mother. This has been observed primarily among sharks, such as the shortfin mako and porbeagle, but is known for a few bony fish as well, such as the halfbeak Nomorhamphus ebrardtii.[32] Intrauterine canniba lism is an even more unusual mode of vivipary, in which the largest embryos eat weaker and smaller siblings. This behavior is also most commonly found among sharks Aquarists commonly refer to ovoviviparous and viviparous fish as livebearers.Etroplus maculatus, the cleaner, and the much larger Etroplus suratensis. Immune organs vary by type of fish.[33] In the jawless fish (lampreys and hagfish), true lymphoid organs are absent. These fish rely on regions of lymphoid tissue