| 主要参考文献 | Zaráte, M. et al., 1989 |
|---|---|
| 附注 | Occurs in diverse habitats from free flowing clear water streams, well up into the valleys, to slow turbid waters, water courses, irrigation and drainage ditches, and ponds on the plains (Ref. 11225). Known to occur at a temperature range of 30-35.5 °C, ph range of 4.8-6.9, and an alkalinity range of 105-315 (Ref. 9116). Rests in vegetation during the day and is active at night (Ref. 6858). Forms schools or may occur in small groups. Is mainly diurnal (Ref. 9084). Adults feed on fish; juveniles feed on crustacean and insect larvae (Ref. 26543, 26681), shrimps and other small invertebrates (Ref. 12225). Fish 2-10 cm SL are characterized as insectivores and >10 cm SL are piscivores (Ref. 59290). Has a digestive tract adapted to a piscivorous diet, which is independent of its ontogenetic stage of development. Small individuals <10 cm showed negative allometry, as their digestive tracts are not well adapted to efficiently exploit the food ingested (insects) (Ref. 59290). |
| Marine - Neritic | Marine - Oceanic | Brackishwater | Freshwater | |
|---|---|---|---|---|
| Marine zones / Brackish and freshwater bodies |
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| 基质 | |
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| 基底 参考文献 | |
| 特殊生境 | |
| 特殊生境 编号 |
| 参考文献 | |
|---|---|
| 协会 | |
| 相关联 | |
| 协会备注 | |
| 寄生虫 |
| 摄取食物的类型 | mainly animals (troph. 2.8 and up) |
|---|---|
| 供料类型 参考号 | Soares, M.G.M., R.G. Almeida and W.T. Tunk, 1986 |
| 摄取食物的习惯 | hunting macrofauna (predator) |
| 喂食习惯 参考文献 | Teixeira de Mello, F., C. Iglesias, A.I. Borthagaray, N. Mazzeo, J. Vilches, D. Larrea and R. Ballabio, 2006 |
| Estimation method | 最初的样本 | 不捕获族群 | 附注 | ||
|---|---|---|---|---|---|
| Troph | s.e. | Troph | s.e. | ||
| 从食物内容 | 4.50 | 4.17 | 0.62 | Troph of adults from 1 study. | |
| 从个别的食物项目 | 3.80 | 0.95 | Trophic level estimated from a number of food items using a randomized resampling routine. | ||
| 参考文献 | Soares, M.G.M., R.G. Almeida and W.T. Tunk, 1986 | ||||