Über die Beziehungen zwischen Eizahl und Eigewicht bei Fischen
2014
Peters, Hans M.
The number of eggs per clutch in Tilapia mossambica (Cichlidae, Teleostei) greatly increases with bodyweight. But the values are scattered within wide limits. On the other hand a very exact correlation is shown, if one compares the weight of the clutches with the bodyweights. That means, that the fish either produce relatively few large eggs or relatively many small eggs, in such a way, that for every bodyweight there is given a definite total clutchweight. The animal is ready to spawn, when this relationship is reached. The clutch remains in this condition for only a short time. If no spawning takes place, than the eggs are resorbed, and a new clutch is formed. After investigation of the developmental history one can propose, that at the beginning of clutch formation there are individual differences in the number of oocytes competent for yolk deposition; whether the clutch is composed of larger or smaller eggs appears to depend on the number of competent oocytes, which were present.
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