Showing papers in "Aquaculture in 1990"

TL;DR: Scanning electron microscopic observations show that colonization by the bacteria occurred specifically on the feeding apparatus and oral cavity of the larvae, suggesting an oral route of entry for the initiation of infection.

TL;DR: Hematological tests revealed oxidative stress caused by the OMP-1 diet, as measured by hemolysis, while hematocrit and percent hemoglobin values fell within a narrow range across diet groups, suggesting that a physiologically optimum level of long chain fatty acids is maintained in rainbow trout.

TL;DR: Six isonitrogenous, isocaloric diets containing 0, 14, 28, 42, 56 and 70% soybean meal as replacement of 0, 20, 40, 60, 80 and 100% of animal protein were fed to juvenile P. vannamei to satiation to determine feed intakes and body phosphorus percentage.

TL;DR: It is concluded that if spring growth is inadequate, maturation is switched off physiologically, preventing maturation when the growing season starts late, and is too short for fish to acquire sufficient reserves for spawning.

TL;DR: Average per locus allele-frequency variances between the progenitor and derived hatchery populations are normally distributed after appropriate transformation, indicating that divergence of hatchery stocks from Dabob Bay population owes to random genetic drift.

TL;DR: The detection of two well-defined pH optima, one at slightly acidic and the other at alkaline pH for both the intestinal and pancreatic lipases suggests a physiological versatility for lipid digestion in milkfish.

TL;DR: The results indicate that oxytetracycline may, under stagnant anoxic conditions, be very persistent in fish farm sediments and it is suggested that leakage from sediments, not decomposition, may be the main factor reducing the oxyTetracy Cline levels in sediments.

TL;DR: The respective advantages of quantitative, Mendelian and molecular biology approaches in order to improve disease resistance in fish are discussed.

TL;DR: Nine enzymes have been measured in turbot larvae and in the most common live diets (rotifers, Artemia sp. and copepods) and the significance of these results with regard to the importance of exogenous enzymes in turbots larval digestion is discussed.

TL;DR: It is suggested that high stocking density has the effect of mobilizing triglyceride sources, promoting gluconeogenesis from glycerol, but has little effect on protein metabolism.

TL;DR: Dietary supplementation of vitamin E effectively stabilized lipids in trout fillet and established significant differences between the dietary treatments; all significant preferences were for fillets with the higher vitamin E levels.

TL;DR: Feeding frequency and fish density were varied in a 3 2 matrix rearing experiment with rainbow trout of initial size between 130 and 250 mm fork length and mean individual growth rate was highest in the lowest density and lowest in the highest density.

TL;DR: The results indicate that a long-term selection program on coho salmon could produce large improvements in performance without dramatically reducing genetic variation.

TL;DR: Ration restriction during any month from December to April reduced the proportion of female Atlantic salmon maturing during the subsequent summer and autumn, through food restriction just at the time when intake is normally increasing.

TL;DR: Feeding various pigments did not result in any notable changes in daily feed intake, percent gain or feed efficiency, and total carotenoid and astaxanthin ester concentrations of the prawn after 8 weeks increased with increasing dietary astaxAnthin level up to 200 ppm.

TL;DR: The total number and weight of fishes caught beside farm cages were greater than at their respective control sites, in Argyll, western Scotland, and the possible consequences for the aquaculture industry are discussed.

TL;DR: Estimated amino-acid contents of the diets indicate that the increase in growth produced by including fish meal may be explained on the basis of increasing dietary levels of the most limiting amino acids; however, the increased in growth effected by including the other animal protein sources in the diet cannot be explanation on that basis.

TL;DR: Long-term evaluation of different cotton seed meals as protein sources for Nile tilapia, Oreochromis niloticus, indicated that CC was economically the best, followed by DC, while FM diet showed the least economic potential.

TL;DR: Initial swimbladder inflation in Sparus auratus was artificially inhibited by covering the surface of the rearing tanks with a layer of liquid paraffin and the results showed that the larvae must gulp air to achieve inflation.

TL;DR: Electrophoretic assessment of the natural reproductive success of sympatric transplanted hatchery and wild summer-run steelhead trout Oncorhynchus mykiss populations was extended to include returns to the adult life history stage, suggesting that influences such as predation and competition affected survival of hatchery offspring to a greater extent than did environmental and ecological effects directly associated with differences in parental spawning time.

TL;DR: Results imply that Nannochloropsis treatment was strongly associated with EPA and implies that, despite other sources of nutrition in the algal media, this fatty acid determines the dietary value of these rotifers for growth in Sparus aurata larvae.

TL;DR: A practical inclusion limit of 15% rapeseed meal in tilapia feeds is indicated and the central colloid regions in thyroid follicles of fish receiving high rapeseed diets were found to be eroded or completely absent from the lumen.

TL;DR: The status of freshwater prawn culture globally in terms of research, rearing technology, marketing and economics is summarized in this review.

TL;DR: The absorption and elimination of oxytetracycline in serum, muscles and liver of rainbow trout were studied after a single oral dose of 75 mg/kg fish and the elimination of the drug was markedly temperature-dependent.

TL;DR: The “thresholds” of ammonia and nitrite toxicity were found at 144 and 240 h, respectively, on a toxicity curve approaching an asymptote, and safe values for rearing adolescent P. monodon were calculated.

TL;DR: It was concluded that the alfalfa leaf protein could be included at levels of up to 35% of the dietary protein in feeds for tilapia, with growth rates higher than those obtained with a fish meal-based diet.

TL;DR: Data suggest that either defatted soybean meal or full-fat soybean Meal can be used to replace 30% fishmeal protein in a diet for Oreochromis niloticus×O.

TL;DR: Effective population size and the rate of inbreeding ( ΔF) have been estimated in terms of the numbers of new individuals entering the broodstock population each year and the variance of their reproductive success.

TL;DR: Temperature significantly affected plasma cortisol, glucose, chloride, and hematocrit but not osmolality in fish acclimated to 5, 10, 16, 21, 25 and 30°C in yearling striped bass.

TL;DR: A commercially obtained spray-dried preparation of Tetraselmis suecica, as used for mollusc and prawn diets, was observed to rapidly inhibit prawn pathogenic strains of Vibrio spp.