Figure 6

pH changes in the GI-tract of Atlantic halibut larvae during development. Panel A: results of tube feeding pH indicator solutions into larva from premetamorphosis (stage 5) to climax metamorphosis (stage 9A and 9B). pH sol mCP contained 0.1% M-Cresol purple, sol CPR consisted of 0.1% Chlorphenol Red and pH sol BPB had 1% of Bromophenol blue. st: stomach/presumptive stomach; mg: midgut; hg: hindgut. Scale bar = 0.5 mm. Panel B: standards immersed in water and photographed with similar light condition as larvae under the dissecting microscope.