Temperature Tolerance of Loliginid Squid (Loligo vulgaris Lamarck, 1798) Eggs in Controlled Conditions (original) (raw)

2005, Turkish Journal of Fisheries and Aquatic Sciences

Loligo vulgaris Lamarck, 1798 spawns monocyclic and egg-laying occurs in separate batches during the spawning period (Rocha et al., 2001). Egg capsules of L. vulgaris are laid on the underside of rocky overhangs, on branched sessile organisms (Boletzky, 1998) or on fishing lines (Villenueva, 2000; Villanueva et al., 2003; see also “Materials and methods” of present study) and hang down in the water. The egg masses comprise dozens to hundreds of finger-like egg capsules, 60-160 mm in length, and each capsule containing 50-130 eggs of 1.92-2.88 mm in diameter (Mangold-Wirz, 1963; Worms, 1983; Marthy and Aroles, 1987; Martins, 2001; en, 2003, 2004). Temperature is the main factor that regulates the length of embryonic development in cephalopods (Boletzky, 1987). Embryogenesis of L. vulgaris depends on the experimental water temperature, ranging from a few weeks to a few months (Naef, 1928; Jecklin, 1934; Mangold-Wirz, 1963; Boletzky, 1974; 1987; en, 2003; 2004). Villanueva et al. (2003...