REPRODUCTION IN 3 SPECIES OF FISH FROM THE ROSS-SEA AND MAWSON-SEA

Reproductive characteristics are compared of the nototheniids Trematom us bernacchii and T. hansoni and the channichthyid Chionodraco hamatus caught in summer at Terra Nova Bay (Ross Sea) and caught all the year round in the waters off Casey Station (Mawson Sea). Whilst spawning o f T. bernacchii took place in October-November off Casey and probably at Tetra Nova Bay, the spawning period of T. hansoni differed between the sites (September-November off Casey, December-February at Terra No va Bay). The spawning period also differed between sites for C. hamatu s (August-October off Casey, December-February at Terra Nova Bay). Fec undity was higher and egg size was lower in nototheniid species (c. 80 00 eggs of 3-4 mm) than in channichthyid (c. 4000 eggs of 4-5 mm). Mor eover, the fecundity was lower and egg size higher in the specimens fr om Terra Nova Bay when compared to Casey.