Influence of rearing temperature at two periods during early life on growth and sex differentiation of two strains of European sea bass

Environmental Effects on Fish Sex Determination and Differentiation

“…9 sires factorial matings [Saillant et al, 2002]. Strain effects were also observed at various temperatures [Mylonas et al, 2003]. Considering the overall masculinizing effect of rearing temperatures usually applied in intensive sea bass farming (20-24°C), genetic variation in sex ratios under these conditions can be partially attributed to genetic variation of temperature sensitivity.…”

“…All experiments compared sex ratios of 'control' groups reared at high temperature (20-24°C), consistent with standard aquaculture conditions, with those obtained at lower temperatures (13-15°C), similar to temperature conditions encountered by wild juveniles in Southern Europe. An excess of females (70-75%) occurred when cold temperature treatments started before hatching and were applied until the middle of the metamorphosis of larvae into juveniles (17-18 mm), followed by an increase in temperature [Pavlidis et al, 2000;Komoundouros et al, 2002;Mylonas et al, 2003], whereas the control groups reared at 20-22°C had an excess of males. When low temperatures were applied later (at 55 dph -18 mm or later), sex ratios were similar to those in the control groups reared under high temperatures (55-95 dph) [Mylonas et al, 2003].…”

“…An excess of females (70-75%) occurred when cold temperature treatments started before hatching and were applied until the middle of the metamorphosis of larvae into juveniles (17-18 mm), followed by an increase in temperature [Pavlidis et al, 2000;Komoundouros et al, 2002;Mylonas et al, 2003], whereas the control groups reared at 20-22°C had an excess of males. When low temperatures were applied later (at 55 dph -18 mm or later), sex ratios were similar to those in the control groups reared under high temperatures (55-95 dph) [Mylonas et al, 2003]. At a first glance the temperature data of sea bass support the hypothesis that the labile period occurs essentially between half epiboly and a mean body size of 17-18 mm.…”

Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures

“…Temperature is also known as the most important environmental, sex determining factor for aquatic species [ 18 ]. Some studies show that water temperature can affect the sex ratio of some fish species, as in tilapia [ 19 , 20 , 21 ], guppy [ 22 ], medaka [ 23 ], and european sea bass [ 24 ], and of some crustaceans namely Porcellionides pruinosus (Isopod) [ 25 ], Tigriopus californicus (Copepod) [ 26 ], and Neocaridina davidi (Caridea) [ 18 ]. Knowledge of the extent to which temperature affects sex ratios is relevant to gauge potential threats of rising temperature on fish populations [ 27 ].…”

The effects of temperature on sex differentiation and growth of black sea bass (Centropristis striataL.)

“…Water temperature in particular has been shown to influence phenotypic sex determination in many commercially important teleost species including Paralichthyd flounders (Kitano, Takamune, Kobayashi, Nagahama & Abe 1999; Borski, Luckenbach, Daniels & Godwin 2003; Luckenbach, Godwin, Daniels & Borski 2003), Atlantic halibut ( Hippoglossus hippoglossus L.; Van Nes & Andersen 2006), barfin flounder ( Verasper moseri ; Jordan & Gilbert; Goto, Mori, Kawamata, Matsubara, Mizuno, Adachi & Yamauchi 1999), European sea bass ( Dicentrarchus labrax L.; Mylonas, Anezaki, Divanach, Zanuy, Piferrer, Ron, Peduel, Ben Atia, Gorshkov & Tandler 2003), and Nile tilapia ( Oreochromis niloticus L.; Bezault, Clota, Derivaz, Chevassus & Baroiller 2007; Rougeot, Prignon, Kanfitine, Ngouana Kengne & Melard 2007; Rougeot, Prignon, Ngouana Kengne & Melard 2008). Thermal effects on sex differentiation occur during a critical period (Ospina‐Alvarez & Piferrer 2008) and are mediated through the enzyme cytochrome P450 aromatase (aromatase).…”