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Contribution to the knowledge of the biology of Prochilodus lineatus (Valenciennes, 1837) in a neotropical river basin
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Researchers studied the biology, population dynamics, and natural diet of Prochilodus lineatus in the Sorocaba River Basin, Brazil, capturing 74 individuals and finding negative allometric growth in both sexes. Microplastic particles were detected in 5% of specimens, with the species' diet otherwise dominated by autochthonous organic matter including algae, seeds, and invertebrate larvae.
This study provides information on the spatial distribution, population variables, and natural diet of the species Prohilodus lineatus in the Sorocaba River Basin, located in the state of São Paulo, SP, Brazil. The species is distributed mainly along the middle and lower Sorocaba River channel, in addition to its tributaries. A total of 74 individuals were captured, 46 females and 28 males of P. lineatus. The captured specimens ranged in length from 31.0 cm to 48.0 cm and weighed from 177 g to 4530 g. Females (n = 46) had a mean weight of 892.34 ± 782.34 g and a mean length of 44.65 ± 2.54 cm, while males (n = 28) had a mean weight of 752.25 ± 390.33 g and a mean length of 44.57 ± 3.25 cm. The weight-length relationship was not statistically different between sexes, and both sexes showed negative allometric growth, with a regression constant (b) value of 2.6889 for females and 2.7586 for males. The species’ natural diet consisted mainly of items of autochthonous origin, mainly vegetables, seeds, muddy and sandy sediments, filamentous algae, Chironomid larvae, nematode worms, and insect eggs, in addition to microplastic particles detected in 5% of the specimens.
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