Reproduction and embryogenesis of the mandi‐amarelo catfish, Pimelodus maculatus (Pisces, Pimelodidae), in captivity

Abstract

To study reproduction and embryogenesis, Pimelodus maculatus specimens were kept in captivity and captured bimonthly during 1 year. Gonads samples (211 specimens) were collected and submitted to routine histological techniques. Pimelodus maculatus prepared to reproduce when water temperature was high, and even reached advanced maturation but did not spawn in captivity. Spent fish gonads were not documented, and atretic follicles were frequent (60%) in late maturation females. When then submitted to hypophysation, 70% of the females responded positively to hormonal treatment. Oocyte extrusion occurred 8 h after a second hormonal injection at 26°C. The fertilisation rate was 65.1 ± 9.2% at 24°C. Recently spawned oocytes of P. maculatus were spherical, non-adhesive, yellow in colour, with an average diameter of 1113.92 ± 37.02 μm and covered by a thick gelatinous layer. Blastopore closure occurred 7 h and 30 min after fertilisation. Embryonic development was completed within 18 h after fertilisation. The results of this work provide important knowledge for the handling and cultivation of not only P. maculatus, but other species of potential value for fish culture.

Fatty acid and proximate composition of wild male and female king angelfish (Holacanthus passer) gonads during the ripe and spent developmental stages

“…Additionally, it is well known that the reproduction of marine finfish under controlled conditions also reduces the impact of heavy fishing pressure on wild populations (Mehdi and Ehsan, 2011;Arantes et al, 2012), but successful reproduction in captivity requires the knowledge of several aspects of the adult life stage of an organism (Izquierdo et al, 2001;Olivotto et al, 2011). For H. passer, Arellano-Martínez et al (1999) established that it is a partial spawner with asynchronous development of the gonads; its reproductive cycle is dictated by five phases of gonadal development, with sexual maturity and reproductive activity attained during the period of April to November.…”

Induced spermiation ofPimelodus britskii(Teleostei: Pimelodidae) during the reproductive period

“…In P. britskii does not have seminal vesicle and secretion in the caudal region was not detected, corroborating what had been observed by Arantes et al . () and Diemer et al . () for Rhamdia voulezi .…”

“…The lower values of P. britskii sperm concentration are probably related to the release of semen from the caudal region of the testes alone. The P. britskii testes are similar to P. maculatus testes (Arantes, Borçato, Sato, Rizzo & Bazzoli ) and have secretory activity, whereas the fringes of the cranial and intermediate region have spermatogenic function. It was possible to characterize the reproductive cycle of P. britskii as continuous process, consisting of two components (i) seminiferous lobules and (ii) interstitial tissue (Diemer et al .…”

Food characterization of the spotted pimelodid fish Pimelodus maculatus from a polluted urban river in Argentina

“…They analyzed the effect of the temperature and lunar phase on stream fish passage at Igarapava Dam, Brazil. Arantes et al [5] studied the reproduction and embryogenesis in captivity concluding that this species at high water temperature reached the maturity but did not spawn. Hirt et al [2] analyzed the reproduction and growth of P. maculatus on the Yacitreta Dam.…”

“…Pimelodus maculatus Lacepède 1803 is an endemic species from South American rivers [3,4] commonly fished for nutritional and recreational purposes [2,5,6]. It is characterized for being an omnivorous fish, therefore is said that it can be found in almost all trophic levels of freshwater ecosystems [1].…”