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11 <br />Results of rearing razorback sucker larvae in protected (i.e, <br />predator-free) habitats are similar. Sucker alrvae propagated under <br />hatchery conditions show steady, normal growth (Toney 1974, Inslee 1982, <br />Hamman 1985), and we observed that individuals raised in both the <br />Arizona Bay backwater and in cages in Lake Mohave attained lengths up to <br />3 times those of larvae in the lake at large. While the backwater and <br />Lake Mohave certainly represent distinct habitats, they also share many <br />characteristics. We conclude that growth of larval razorback suckers is <br />not precluded by physical or chemical contraints in Lake Mohave as <br />suggested by Bozek et al. (1984). Razorback sucker in Lake Mohave thus <br />have the potential to recruit to larger size classes than yet collected <br />-in nature. Reasons for their apparent disappearance-from the lake at <br />about 10-12 mm TL remain unknown. <br />LARVAL FOODS AND FEEDING <br />Zooplankton have been identified as the primary food of larval <br />razorback sucker in the wild (Langhorst 1985, 1986; Langhorst et al. <br />1985). We undertook to quantify food resources and larval food habits <br />with particular attention to sizes of food and potential selection by <br />larvae. Zooplankton in Lake Mohave was sampled from early January <br />through mid-April in duplicate by Clarke-Bumpus sampler (153 u mesh) <br />towed for 5 minutes at 1.3 km/h at ca. 3 m depth. Primary areas were <br />. where larval suckers were found along the Arizona Bay shoreline and in <br />the vicinity of Hammerhead Cove. Samples from the Arizona Bay backwater <br />from late March to early May were duplicate, composite 38-L grabs <br />concentrated through a 153 u net. Samples were preserved in 5% formalin <br />and later identified (Ward and Whipple 1959) enumerated (standard