Changes in Blood Lactic Acid Concentrations in Alewives (\u3ci\u3eAlosa pseudoharengus\u3c/i\u3e) During Passage Through a Pool and Weir Fishway

Blood lactic concentration of anadromous alewives (Alosa pseudoharengus) sampled during their upstream migration through a pool and weir fishway was not extremely high (46.7 mg/100 ml) and the degree of exercise exhibited during ascent was judged to be moderate. For fish that were subjected experimentally to severe exercise, the concentration (108.7mg/100ml) was more than five times that for rested fish (18.9mg/100ml). Of the three groups of fish sampled directly from the fishway pools, only one had an average concentration that differed significantly from that for the rested state