By Brian Harvey, Anton Baer, Joachim Carolsfeld, Carmen Ross
Fish species that migrate in the nice rivers of South the US help very important neighborhood fisheries yet are little recognized outdoors their local variety. This publication, written specially for the area financial institution and the overseas improvement examine Centre, represents the 1st selection of medical specialists on those notable fish. The authors hide the higher Parana, Paraguay-Parana, Uruguay and Sao Francisco basins in Brazil, in addition to the Brazilian and Colombian Amazon. They talk about not just the important migratory species and their interesting dating with the water cycle within the rivers and wetlands, but additionally the fisheries they help, and their frequently precarious conservation prestige.
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Extra resources for Migratory Fishes of South America: Biology, Fisheries and Conservation Status
62 Most of the migratory fishes analysed here reach first maturation at a proportionally larger size, from 45% to 55% of the maximum size registered. P. lineatus is an exception, reaching maturity at 36% of the maximum length (28 cm). Reproductive Strategy Besides high fertility, migratory fishes have small oocytes, short incubation times and small larvae (Table 2). 8 mm (P. 6 mm (Brycon orbignyanus). 0 mm. Despite the bias arising from measuring eggs and oocytes preserved in formalin, hydration increases egg sizes by 42% (P.
51 Figure 6 shows the ascending movements of P. lineatus starting from the Itaipu Reservoir. 52 However, in an 80 km lotic stretch of the Paranapanema River between the Capivara and Salto Grande reservoirs, fifteen years after the construction of the dam schools of the migratory S. maxillosus and P. corruscans are still found during the reproductive period. 53 These results suggest that migratory fish populations vary widely in their requirements for a home range, depending on the species. In the lower stretch of the Upper Paraná (230 km long), where the incoming tributaries are not impounded, populations of all the migratory fishes are still found.
Springs in the sedimentary basin give rise to the Ivinheima, Iguatemi, and Amambai rivers. Rapid rivers are located in the eastern margin, have high slopes, rocky bottoms, and are long (more than 400 km). Springs in crystalline rocks of the Serra do Mar give rise to the Piquiri, Ivai and Iguassu rivers. Secondary channels are a net system (anostomosis) composed of the lower part of the tributaries on the western side of the Paraná and channels that connect the floodplain to the river. Substrate in the secondary channels is sandy or muddy.