Growth and tissue biochemical composition of Haliotis fulgens atelevated temperatures in Baja California under two dried brown algaldiets

摘要

Growth, survival, and tissue biochemical composition of juvenile green abalone Haliotis fulgens were recorded for two temperature regimes simulating the contrasting marine conditions, one as a normal year and the other as an El Nino 1997 to 1998 event during 120 days in the laboratory. Abalones were fed Macrocystis pyrifera or Eisenia arborea. During the experiment, juveniles were sampled for biochemical analysis at the maximum temperature, which occurred at 60 days and at 120 days. Significant differences in growth of shell length and wet body weight among treatments were recorded. The highest growth (39 mu m times day super(-1) and 16.0 mg times day super(-1)) occurred in juvenile abalone within the El Nino temperature pattern and fed M. pyrifera. Survival rates were approximately 95% without significant differences between treatments. At maximum temperature, juveniles within the El Nino pattern had higher levels of protein in the hepatopancreas, regardless of diet. A significant interaction between temperature regimen and food was observed for glycogen in muscle, with the highest levels in juveniles fed M. pyrifera within the El Nino pattern. At the end of the experiment, juveniles in the normal year pattern had higher levels of lipids in the hepatopancreas. Increased levels of protein, total carbohydrates, and glycogen in muscle were present in juveniles in the El Nino pattern, regardless of diet. Juveniles fed M. pyrifera had higher levels of protein and lipids in the hepatopancreas and increased levels of protein, carbohydrates, and glycogen in muscle tissue, regardless of temperature regimen. The influence of diet and temperature regimen on several biochemical components closely matched their effects on growth.