Showing papers in "Aquaculture in 1977"

TL;DR: A trend towards increased body fat with more frequent feeding was observed among fish fed to satiation at each meal; this was believed to be the result of a somewhat higher total food intake than among less frequently fed fish.

TL;DR: There was a linear relationship between the percentage of protein in the diet and the increase in fish protein and weight up to optimal levels of 41 and 43%, respectively.

TL;DR: The technology developed by the authors for the routine decapsulation of Artemia cysts is described and the advantages which result from the use of decapsulated cysts in aquacultural hatcheries are discussed.

TL;DR: Identification of the molt state reduces hatchery operating costs and provides crustacean researchers with a means to improve experimental design.

TL;DR: It is concluded that high densities depressed the growth rate, and that compensatory growth occurred when the densities were standardized, and it is important to take density into account when ranking families or progeny groups for growth performance.

TL;DR: Determination of the physical and chemical parameters for optimum water purification, the most suitable ratio of denitrification by plants and by microorganisms, and the most favourable fish and plant species for combined culture in recirculating water are important in view of the increasing demand for clean, fresh water.

TL;DR: The common carp and white amur showed the greatest responses to increased feeding inputs while the silver carp and Tilapia, even at high densities, have done equally well at low feeding levels, which justified the extra cost of high-protein feed.

TL;DR: Oysters showed periods of high filtering activity and periods of relative quiescence during experimental trials of 24 h duration, and a discontinuous feeding regime is proposed along with an equation predicting the maximum daily ration of oysters of various sizes.

TL;DR: Little variation between different fish families, and no interaction between fish family and diet was found for any of the above parameters, indicating that prospects for change through selective breeding are poor.

TL;DR: Preliminary experiments resulted in successful spawning of captive stock of the prawn Penaeus monodon to complete the life cycle and produce a viable F1 generation of larvae.

TL;DR: Growth was consistently better in the absence of penicillin-streptomycin mixtures and the optimum salinity for larval rearing was not significantly altered when adults were conditioned for spawning at different salinities.

TL;DR: Various procedures of hyperosmotic infiltration and intraperitoneal injection were used to vaccinate sockeye salmon with killed Vibrio anguillarum, and excellent protection was evident against experimentally induced vibriosis in the groups immunized by HI and injected groups.

TL;DR: If some of the treated fish are eventually found to be tetraploids and fertile, they will be used to produce triploid offspring by crossing with normal diploid fish.

TL;DR: Hypothetical curves relating temperature, food availability, and oyster growth are proposed and suggest that under ideal conditions and with high food availability maximum growth might be achieved at temperatures approaching 20°C.

TL;DR: It was found that rainbow trout can utilize soya bean protein enriched with cystine and tryptophan almost as well as protein from the fish meal, and an addition of amino acids improved the utilization of feeds.

TL;DR: Conditions in the local waters are extremely favourable for mussel culture so that the local species, Mytilus viridis Linnaeus, attains marketable size within 7–8 months which is about twice as fast as the European mussel.

TL;DR: In this article, the authors found that heavy infection with epitheliocystis on gills caused mortality in hatchery-born Sparus aurata and mullets reared from natural stocks, infection remained benign and sporadic.

TL;DR: The temporal and spatial distribution of major plant and animal species were investigated for 4 years in south Biscayne Bay including Card Sound, Florida, a subtropical estuarine lagoon, highlighting the structural differences in what is now termed the “ Thalassia community”.

TL;DR: The virulence of nine Aeromonas hydrophila isolates from diseased fish, diseased Macrobrachium (freshwater shrimp) and from pond water was determined in channel catfish fingerlings.

TL;DR: In this paper, the second of a series of investigations into the biology of young grey mullet, Mugil cephalus L., and the feasibility of its culture in the coastal, estuarine waters of Sri Lanka were studied from November 1974 to October 1975.

TL;DR: “Priming” with a low dose of carp pituitary extract was found necessary for a subsequent successful treatment with 17α-hydroxy-20β-dihydroprogesterone and was shown to increase the gonadotropin level in plasma from about 2 to 35 ng/ml and to induce germinal vesicle migration toward the periphery of oocytes.

TL;DR: Highly significant differences were found between growth of different fish families fed the same diet, but no interaction between diet and family was found, indicating that the prospects for selectively breeding strains of rainbow trout specifically better able to utilize carbohydrate are not promising.

TL;DR: The predominant diseases occurring in Sparus aurata cultured in sea water at Elat were bacteria-contaminated skin lesions, gill rot and septicemia, and visceral granuloma, which appeared in fish fed on certain artificial diets containing fish meal but not in fish feeding on fresh mussels or fish meat.

TL;DR: A comparative study was made of the trophic relations existing between Hypophthalmichthys molitrix (Val.), Cyprinus carpio (L.) and Tilapia aurea Steindachner, and of the influence of the type of pond used on the growth of the fish.

TL;DR: The distribution and ecological niche of the dugong are considered in relation to their effects on tropical seagrass ecosystems, features of the chemical and calorific nature ofSeagrasses are contrasted to those of most terrestrial plants.

TL;DR: P. clarkii has been introduced into the catchment areas of three major Kenyan rivers, including the Nzoia River draining to Lake Victoria and the implications for established gill net fisheries are discussed in the light of experience at Lake Naivasha where the species is a nuisance.

TL;DR: The impact of two herbivorous crustaceans on seaweeds raised in an aquaculture system has been estimated from laboratory determined grazing rates and estimated crustacean densities in the system.

TL;DR: Significant differences were noticed between highest and lowest 2-h values, indicating a possible circadian rhythm of ammonia excretion and nitrogen metabolism in fish.

TL;DR: It is concluded that aging of spermatozoa occurs during the spawning season.