Reproductive and population dynamics of the Bay whiff Citharichthys spilopterus Günther, 1862 (Pleuronectiformes: Paralichthyidae) in the Mamanguá Inlet, Rio de Janeiro, Brazil

Abstract

Bay whiffs, Citharichthys spilopterus, were sampled in Mamanguá Inlet between March 1990 and March 1992 for evaluation of its reproductive dynamic. Bay whiffs presented a crescent gradient of abundance from the deepest to the shallowest stations. The mean total length by oceanographic station showed a clear tendency of a relationship between bigger sizes and higher depths. Males predominated along the studied period and on the smallest length groups. Higher values of alometric condition factor, gonadosomatic relationship and spawning stage of maturity indicated a higher degree of development of the gonads on March and November. Histological analysis showed spawning females in March and May 1990 in the stations closer to the mouth of the Inlet, and spawned females with old post-ovulatory follicles and high frequency of atresia at shallow stations, suggesting a migration to shallow and protected areas after spawning. Length of first gonadal maturation was 117 mm TL. We could conclude that C. spilopterus completes its life cycle within the Mamanguá Inlet, spawning during autumn (March to May) and possibly November.<br>Espécimes de Citharichthys spilopterus foram coletados no saco do Mamanguá entre março de 1990 e março de 1992 para avaliação de sua dinâmica populacional e reprodutiva. Os linguados apresentaram um gradiente crescente de abundância da estação mais profunda para a mais rasa. A média do comprimento total por estação oceanográfica mostrou uma tendência de relação entre maiores tamanhos e maiores profundidades. Os machos foram predominantes durante o período de estudo e nas menores classes de comprimento. Altos valores de fator de condição alométrico, relação gonadossomática e estádios mais adiantados de maturidade gonadal indicaram alto grau de desenvolvimento das gônadas em março e novembro. Análises histológicas mostraram fêmeas desovantes em março e maio nas estações próximas à boca do saco, e fêmeas desovadas com folículos pós-ovulatórios velhos e alta freqüência de atresia em estações rasas, sugerindo a migração para áreas rasas e protegidas após a desova. O comprimento de primeira maturação gonadal foi 117 mm de comprimento total. Podemos concluir que C. spilopterus completa seu ciclo de vida no saco do Mamanguá, desovando durante o outono (entre março e maio) e possivelmente também em novembro

Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae): Implications for the conservation of this species

“…Histological analysis showed that the stage of maturation reached is adequate for induced ovulation, due to the presence of several vitellogenic oocytes and post-ovulatory follicles after induction. However, some oocytes were not released and became atretic (Dias et al, 1998(Dias et al, , 2005Honji et al, 2006Honji et al, , 2009. This phase of the development is observed and discussed in some works, including studies in S. hilarii (Takahashi, 2006;Honji et al, 2009).…”

Rare data on a rocky shore fish reproductive biology: sex ratio, length of first maturation and spawning period of Abudefduf saxatilis (Linnaeus, 1758) with notes on Stegastes variabilis spawning period (Perciformes: Pomacentridae) in São Paulo, Brazil

“…total body weight minus gonad weight GSR 1 and GSR 2 must present major values in the period when the ovaries contribute the most to the individuals' total weight, the period prior to laying the oocytes. Thus, the differences between these two relations were plotted in graphics along the months, evidencing as reproductive period that related to the loss of ovaries weight, due to the spawning process (Dias et al, 2005).…”

Reproductive strategies of the marine fishes from the southwest Atlantic Ocean: an application of histological and image processing techniques

“…BF and RBF for C. spilopterus from Cananéia estuary was lower than that reported by Dias et al (2005) for the population of Mamanguá inlet, Rio de Janeiro, Brazil. BF and RBF estimated by these authors ranged from 7,000 to 61,000 oocytes and from 253 to 1,552 oocytes g …”