Reproduction of the wedge sole (Dicologoglossa cuneata Moreau) in captivity: spawning parameters and influence of the natural temperature

Abstract

In this work, the wedge sole (Dicologoglossa cuneata) spawning under a natural thermocycle has been studied. The spawning parameters were similar to those of other flatfish in captivity, the relative fecundity being very high (1.7 ± 0.1 9 10 6 eggs kg female -1 per spawning season). The percentage of floating eggs decreased with time and was directly related to egg diameter, daily relative fecundity and fertilization rate. Nevertheless, the hatching rate variations were not correlated to any other spawning parameter. The temperature range during the spawning season was very wide (11-21°C) though the largest spawns occurred between 12 and 16°C. The natural temperature cycle influenced wedge sole egg production, the winter temperature minimum indicating the onset of spawning, but the variations in the reproductive season did not appear to affect the daily egg production. Future research should focus on the photoperiod and its interaction with temperature as key factor for spawning.

Early development and Juvenile Culture Technique of Speckled Flounder,Paralichthys woolmani(Jordan & Williams, 1897) under ambient seawater

“…On the other hand, we registered 224,000 eggs in succesive spawns for the same female, as found by Benetti () at lower water temperature conditions. Despite the limited number of females used, our findings showed a similar fertilization rate when compared to Dicologoglossa cuneate (46.8%–73.8%; Herrera et al., ; Herrera, Hachero, García, Mancera, & Navas, ) and P. orbignyanus (47.5%; López et al., ) cultured at temperatures within its ecological limits. Thus, water temperature was an important factor for fertilization during gametogenesis.…”

“…(, ) reported hatching of D. cuneata between 24 and 48 hr post fertilization (HPF), while Lee, Kodama, Oyama, Shiraishi, and Horiguchi () observed a variation in the hatching rate of Pseudopleuronectes yokohamae at different water temperatures. In this sense, hatching of P. woolmani was similar to P. lethostigma for same temperatures (24–28 HPF at 24–26°C; Benetti et al., ) but shorter in time as reported for D. cuneata (48 HPF at 19°C; Herrera et al., ), and P. adspersus (60 HPF at 16°C and 45 HPF at 18°C; Silva & Oliva, ) which inhabit cooler waters. In this study, spawning season lasted 5 weeks (August to September).…”

“…As in other species, hatching time in P. woolmani depends on water temperature rather than species-specific differences per se. Herrera et al (2008Herrera et al ( , 2011 reported hatching of D. cuneata between 24 and 48 hr post fer- (Nissling, Nyberg, & Petereit, 2017).…”

Reproductive biology of the Egyptian sole, Solea aegyptiaca (Actinopterygii: Pleuronectiformes: Soleidae), in southern Tunisian waters (Central Mediterranean)

“…Le Bec (1985), Lamrini & Diop (2001), Teixeira & Cabral (2010), Herrera et al . (2011) and Vinăs et al . (2012) studied this species in the eastern Atlantic, Vallisneri et al .…”