BIOECOLOGÍA Y PESQUERÍA DE Pseudoplatystoma fasciatum (LINNAEUS, 1766; PISCES), DONCELLA, EN LA REGIÓN UCAYALI

Abstract

RESUMENEl estudio se desarrolló durante el periodo de febrero de 2001 a febrero de 2002. Se describen aspectos bioecológicos como hábitos alimentarios, biología reproductiva, relación peso-longitud y algunos aspectos pesqueros. La Pseudoplatystoma fasciatum, doncella, presenta hábitos alimentarios carnívoros teniendo al Prochilodus nigricans, boquichico, como una de las especies más importantes en su alimentación. Su proporción sexual global fue favorable a las hembras (1.51:1); éstas predominan a tallas mayores y los machos a tallas menores. La talla media de madurez es 93.92 cm de longitud total en hembras y de 78.49 cm en machos. El desove se produce a los 102.24 y 87.89 cm en hembras y machos respectivamente; la época de reproducción de esta especie está comprendida entre los meses de noviembre y marzo, su crecimiento es isométrico. Con relación a su pesquería, la producción total durante el 2001 fue de 1 857.6 t llegando a ocupar el segundo lugar en los desembarques. Las principales zonas de pesca son Sheshea en el alto Ucayali y Santa Isabel en el bajo Ucayali. Las artes de pesca más empleadas son las redes tramperas, sin embargo en la vaciante las más efectivas por su mayor producción son las redes rastreras.Palabras clave: región Ucayali, doncella, Pseudoplatystoma fasciatum, bioecología, pesquería, acuicultura. ABSTRACTThe study was carried out during the period from February 2001 to February 2002. Bioecology aspects as alimentary habits, reproductive biology, length-weight relationship and some characteristics of the fishery were described. The Pseudoplatystoma fasciatum, doncella, presents carnivorous habits having the Prochilodus nigricans, boquichico, as one of the most important species in its diet. The global sexual proportion was favourable the females (1.51:1), they were predominant at bigger sizes and the males at smaller sizes. The mean size of sexual maturity was 93.92 cm of total length in females and 78.49 cm in males. This specie spawns at 102.24 cm and 87.89 in females and males respectively. The reproduction season of this specie is between November and March, its growth is isometric. Related to the fishery, the total production for 2001 was 1 857.6 t, being the second species in the landings. The main fishery areas are Sheshea in higher Ucayali river and Santa Isabel in lower Ucayali river. The most employed fishing gears are the trap nets, however, during the decrease of the level of waters (vaciante) the most effective is trawling, nest resulting in higher production the trawl nets.

Population structure and reproductive indicators of the surubim Pseudoplatystoma punctifer (Siluriformes, Pimelodidae) in the São Miguel River, Amazon basin, Brazil

“…It is considered a native fish of the Amazon basin with occurrences in several countries in South America, such as Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela (Castro-Ruiz et al, 2021;Owolabi, 2021). This species exhibits reproductive seasonality, migratory behavior, external fertilization, and total spawning in river channels during rising water season, with no parental care; their eggs are free floating and are yellowish with rapid embryogenesis (Deza-Taboada et al, 2006;Intúrias, 2008).…”

“…It is considered a native fish of the Amazon basin with occurrences in several countries in South America, such as Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela (Castro‐Ruiz et al, 2021; Owolabi, 2021). This species exhibits reproductive seasonality, migratory behavior, external fertilization, and total spawning in river channels during rising water season, with no parental care; their eggs are free floating and are yellowish with rapid embryogenesis (Deza‐Taboada et al, 2006; Intúrias, 2008). These reproductive characteristics of P. punctifer allow for a high abundance of its larvae drifting in the Amazonian river systems toward nursery and growth habitats, coinciding with periods of higher rainfall and an increase in the regional hydrological level (Cajado et al, 2020; Chaves et al, 2017; Zacardi et al, 2017).…”