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Showing papers in "Aquaculture in 1987"


Journal ArticleDOI
TL;DR: The growth rate (% wt/day), depending on fish size (g) and water temperature (°C), has been estimated from a series of full-scale feeding experiments with Atlantic salmon and rainbow trout.

457 citations


Journal ArticleDOI
TL;DR: Caloric content of lipid, carbohydrate and protein in phytoplankton allowed for ranking as sources of energy in the following decreasing order: Isochrysis aff.

304 citations


Journal ArticleDOI
TL;DR: This work has shown that Vibriosis is a term for a group of well known fish diseases reported from a large number of marine fish species, and that several new fish pathogens belonging to this genus have been described during the last few years.

230 citations


Journal ArticleDOI
TL;DR: The aerobic bacterial flora in the intestine of farmed red and black seabream was investigated at their larval and juvenile stages in relation to the microflora of ambient water and diets.

201 citations


Journal ArticleDOI
TL;DR: This study shows that Atlantic salmon can utilize alternate lipid sources in the diet without compromising growth or organoleptic quality and that dietary lipid substitution offers the possibility of producing fish containing fatty acid profiles preferred in the market.

183 citations


Journal ArticleDOI
TL;DR: Twelve groups of Atlantic salmon (Salmo salar L.), raised in fibre-glass tanks, were fed at 12 ration levels for 7 periods, each period lasting 28 days, with an average survival rate of 95%.

161 citations


Journal ArticleDOI
TL;DR: Seasonal changes in ejaculate characteristics were monitored for groups of male rainbow trout which were stripped weekly, beginning at various periods after the onset of the spermiation cycle, and volume was independent of time.

156 citations


Journal ArticleDOI
TL;DR: The carotenoid content of the skin was higher for the fish fed diets containing carotanoids than for the control groups, but there was no significant difference in the carotENoid concentration in the skin of the fish feeding the different carotnoids.

155 citations


Journal ArticleDOI
TL;DR: Measurements of fibre size distribution in red and white muscle mass revealed that the main difference in growth occurred in the white portion of the muscle, and that the raceway fish had a larger proportion of hypertrophied white fibres, but the inner red fibres were smaller.

154 citations


Journal ArticleDOI
TL;DR: It was apparent that the protein and energy of the animal-based foodstuffs were more available to O. niloticus than that of the plant-basedFoodstuff, and this suggested that they practised preferential feeding on certain dietary components.

151 citations


Journal ArticleDOI
TL;DR: It is suggested that without methionine supplementation, fish meal can be replaced partially by commercial hexane-extracted soybean meal when the dietary protein level is suboptimal for tilapia growth, however, at the optimal dietaryprotein level (32%), partial replacement of fish meal protein with protein from soybean Meal depresses both growth and feed conversion in tilapio.

Journal ArticleDOI
TL;DR: Six groups of rainbow trout (Salmo gairdneri Richardson), raised in fibre-glass tanks, were fed at six different ration levels for two periods of 21 days each, and the variation in growth of the fish within various weight classes was influenced by the ration level.

Journal ArticleDOI
TL;DR: Using the results from this study, it was possible to calculate the sources and sinks of ammonia-N to the fishponds in Eilat and find the endogenous excretion rate, which is similar to that of other marine fish and lower than that of freshwater species.

Journal ArticleDOI
TL;DR: It is postulated that oysters, weakened by exposure to low ambient temperature, come into contact with high concentrations of bacteria during transportation to lease sites at which time bacterial invasion occurs.

Journal ArticleDOI
TL;DR: Evaluated dietary calcium and phosphorus requirements of fingerling Oreochromis aureus reared in calcium-free water indicated that 0.70% dietary calcium was optimum for good growth, but whole-body, bone or scale minerals did not clearly reflect the calcium requirement as established by growth.

Journal ArticleDOI
TL;DR: A growth experiment was conducted to determine the optimum feeding rate for juvenile white sturgeon held at 20°C and found that percent body weight increase, feed gain ratio, and final body weight, liver weight, condition factor, and whole body moisture and lipid content were significantly higher than expected.

Journal ArticleDOI
TL;DR: Rhythms in egg production, artificial spawning, the role of pheromones, induction of triploidy, nutrition, feeding and growth of larvae and fingerlings, as well as health control are treated.

Journal ArticleDOI
TL;DR: It is demonstrated that antibiotics have no significant effect on the total lipid content and total fatty acids of the trout, however, all the antibiotics significantly enhanced the digestibility of some unsaturated fatty acids when given at the 0.5% dose.

Journal ArticleDOI
TL;DR: In juvenile chinook salmon (Oncorhynchus tshawytscha), acclimated to 7.5, 12.5 and 21.0°C and subjected to a 30-s handling stress, cortisol elevations were similar in all groups but the return to resting levels was slowest in the fish acclimation to7.5°C.

Journal ArticleDOI
TL;DR: The tolerance of larval Penaeus monodon to ammonia increased as the larvae metamorphosed from the nauplius to the postlarva stage, and the “safe level” of ammonia was 1.15 mg/l ammonia-N on the basis of the 96-h LC 50 value for postlarvae.

Journal ArticleDOI
TL;DR: There is a decline in sperm quality for P. setiferus held under laboratory conditions, with a significant decrease in spermatophore weight between weeks 0–5 and 6–7.

Journal ArticleDOI
TL;DR: The slide agglutination test, using anti whole-cell sera and two antigen preparations (whole-cells and “O” antigen) for each strain, is useful for a rapid detection of fish pathogens, with the additional advantage of its applicability for serotyping studies.

Journal ArticleDOI
TL;DR: Analysis of the optical isomers of astaxanthin in the flesh demonstrated an increased level of (3 R,3′ R )-astaxanthIn in both rainbow trout and sea trout fed the diet containing astax anthin dipalmitate, resulting in enhanced canthaxanth in deposition with diet ii.

Journal ArticleDOI
TL;DR: Results are compared with previous published data of the food value of Isochrysis galbana Parke where some evidence suggests a similar deficiency to that in T-ISO for Crassostrea larvae, which led to growth retardation beyond 6-day-old veligers.

Journal ArticleDOI
TL;DR: Overall, the optimal treatment for inducing triploidy in the Pacific oyster appears to be 30–45 min post-fertilization at 25°C, which yielded 88±9% (SE) triploids over four replicates.

Journal ArticleDOI
TL;DR: Blood vitamin E concentrations, and liver, blood and brain Se concentrations were all significantly lowered in Se-deficient salmon, and glutathione peroxidase activity was greatly reduced in liver of the Se- deficient salmon although there was no indication of any compensatory non Se-dependent glutathioneperoxid enzyme activity.

Journal ArticleDOI
TL;DR: A water recirculation system for the culture of the African catfish has been developed in relation to waste production and waste removal kinetics and it was found that ammonium removal by nitrification could be described by either 1 2 - order kinetics or 0-order kinetics, depending on the ratio of the concentrations of dissolved oxygen and ammonium.

Journal ArticleDOI
TL;DR: No effective preventative or treatment measures for pancreas disease are available, but reduction in stressor factors in husbandry may lessen its impact, and field and experimental data suggest an infectious primary aetiology of natural marine origin.

Journal ArticleDOI
TL;DR: There was a trend of reduced growth performance and feed utilization efficiency with increase in Leucaena leaf meal incorporation for all treatments, and generally, soaked leaf meal gave a significantly better growth response than sundried or commercial leaf meal.

Journal ArticleDOI
TL;DR: In a recent study, this paper found that columnar cells of the cardiac stomach develop into two distinct cell types: columnar and cuboidal cells, which constitute the gastric glands.