WSP06488 - Laserfiche WebLink

Home Browse Search

size (total length, weight, and condition factor) of the female, number of eggs expressed, egg C' diameter, and egg weight; and among hatchability, average day to hatch, incidence of larval (-;') N ,::- abnormalities, survival and growth oflarvae, overall progeny survival, parental dietary and ,.~) c) waterborne selenium concentrations, and selenium tissue residues. Data expressed as percentages were arcsine-square root transformed prior to analysis. Stepwise regression analyses were used to determine the relations of selenium concentrations in adult muscle plugs, eggs, and larvae to dietary and waterborne selenium exposure concentrations of the adults, For correlation and regression analyses, individual spawns were the experimental unit. Statistical results were accepted as significant when P"S0.05. RESULTS Exposure Conditions Mean selenium concentrations in test diets used during the exposure period were 2.18, 7,28, and 11.83 )lg/g dry weight (Table 3). Control diets used during the depuration period contained 2.20 )lg/g selenium dry weight. Mean (SO) percent moisture in the diets were 22.3 (0.3)% for the control diets (exposure and depuration periods, n=14) and 20.5 (0.3)% for the selenium-fortified diets (low and high selenium diets, n=lO). When the mean selenium concentration in the control diet was subtracted from the measured values in the two selenium-fortified diets, selenium concentrations in these diets were within 3,5% of nominal values. During the exposure period, mean waterborne selenium concentrations in treatments with control water and selenium-fortified diets (treatments 3 and 5) were about 9-12 times higher than that in the control treatment (treatment I). In treatments with selenium-spiked water (treatments 2, 4, and 6), mean measured selenium concentrations were 1.1-1,6 times higher than the nominal 24