Reproduction of the wedge sole (<Emphasis Type="Italic">Dicologoglossa cuneata</Emphasis> Moreau) in captivity: spawning parameters and influence of the natural temperature |
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Authors: | Marcelino Herrera Ismael Hachero-Cruzado Sandra García Juan Miguel Mancera José Ignacio Navas |
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Institution: | 1.IFAPA Centro “Agua del Pino”,Ctra. Cartaya—Punta Umbría,Cartaya,Spain;2.Departamento de Biología, Facultad de Ciencias del Mar y Ambientales,Universidad de Cádiz,Puerto Real,Spain |
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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 × 106 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. |
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