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Secondary sexual character of Astyanax bimaculatus Ostariophysi, Characidae, related of the anal and pelvic fins Carater sexual secundario em Astyanax bimaculatus Ostariophysi, Characidae, relacionado as nadadeiras anal e pelvicas



Secondary sexual character of Astyanax bimaculatus Ostariophysi, Characidae, related of the anal and pelvic fins Carater sexual secundario em Astyanax bimaculatus Ostariophysi, Characidae, relacionado as nadadeiras anal e pelvicas



Naturalia (Rio Claro): 15: 109-119



A study of secondary sexual dimorphism of the pelvic and anal fins of Astyanax bimaculatus is reported. The following were observed: 1. The presence of hooks on these fins is seasonal, corresponding with the reproductive period; 2. The greatest roughness of the fins, i.e., the presence of the most developed hooks, corresponds with the reproductive peak; 3. The anal fin can have hooks on the last undivided ray and on the first thirteen divided rays, while the pelvic on the first six divided rays; 4. The hooks are retrorse, strong or in greater number or occur only on the distal and median thirds of the referred rays; 5. There occurs only one hook, at times, two per segment, located mostly on the posterior side of the rays. Also determined are the seasonal and other details of this character for other sympatric species of Tetragonopterinae in the same ambient.

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