Fig. 4. Gastric pH changes in juvenile leopard sharks fed a meal of squid at 1% body mass M_b. Six sharks were fed a second meal of squid (1%M_b) 24 h after the first. The pH of the gastric fluid was determined 1 h after the second meal. All pH readings were corrected to a standardized temperature of 18°C. Values are means ± 1 S.D.; numbers above bars represent sample sizes. Bars with the same letter are statistically insignificant from each other (see text for details).