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See also:BITTERLING (Rhodeus amarus) , a little See also:carp-like See also:fish of central See also:Europe, belonging to the Cyprinid See also:family . In it we have a remarkable instance of symbiosis . The genital papilla of the See also:female acquires a See also:great development during the breeding See also:season and becomes produced into a See also:tube nearly as See also:long as the fish itself; this acts as an ovipositor by means of which the comparatively few and large eggs (3 millimetres in See also:diameter) are introduced through the gaping valves between the branchiae of See also:pond mussels (Unio and Anodonta), where, after being inseminated, they undergo their development, the See also:fry leaving their See also:host about a See also:month later . The mollusc reciprocates by throwing off its embryos on the See also:parent fish, in the skin of which they remain encysted for some See also:time, the See also:period of See also:reproduction of the fish and See also:mussel coinciding . |
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