Showing papers in "Aquaculture in 1980"

TL;DR: This review provides fishery biologists and fish culturists with a summary of those published reports relating to the morphological, behavioral and biochemical changes associated with smoltification and seawater adaptation in anadromous salmonids.

TL;DR: Analysis of intestinal contents of silver carp and bighead carp showed that silver carp consumed primarily phytoplankton whilebighead carp consumed large quantities of zooplankon and detritus in addition to phy toplanktons.

TL;DR: The red yeast Phaffia rhodozyma has possible application as a component of diets for use in aquaculture because of its primary value in its content of astaxanthin, which is much higher than that found in crustacean meals.

TL;DR: Different methods of producing fingerlings in ponds were compared but none was considered satisfactory and it is felt that rearing the fry in troughs offers the best prospects for reliable production of fingerlings.

TL;DR: An alternative application of the finding enables homoplastic hypophysation, using the fresh pituitary of the male to induce ripening of the female, while the sperms are stored for later use.

TL;DR: In this article, the formation and deposition of fatty acids in carp maintained on diets differing in total fat as well as linolenic acid content was investigated by following the incorporation of (1- 14 C)-acetate into liver total- and phospholipid fatty acids at two extreme temperatures (5° and 25°C).

TL;DR: There was a general decline in food conversion efficiency and protein sparing was marginal at the satiation feeding rate and there was very little increase in the lipid content of fish fed on a high protein-low lipid diet.

TL;DR: It was found that a dry trout starter, an experimental dry feed and dried inactive yeast were not suitable feeds for rearing C. lazera fry, and neither could ground Clarias fingerlings or frozen zooplankton be used.

TL;DR: Both humoral and cellular immune responses of carp are suppressed during treatment with oxyTC, and preliminary observations showed an increased number of granulocytes in the spleen of oxyTC-treated animals.

TL;DR: The various aspects of bivalve genetics such as Mendelian genetics, population genetics and quantitative genetics will be reviewed in the light of their roles in breeding for the improvement of the economic value of shellfish.

TL;DR: Investigations reveal that different forms of lecithin have variable effectiveness and that choline, a significant constituent of leCithin, is probably not the active component and an optimal vitamin mix level for this artificial diet has been determined.

TL;DR: Energy balances were determined in growing rainbow trout by means of a comparative slaughter technique and, with the exception of sunflower oil, all supplements caused increased concentrations of ether extract and N-free extract in trout livers.

TL;DR: Epinephelus tauvina (Forskal) has spawned naturally in captivity using rotifers, Artemia nauplii, copepods and minced shrimp meat and the developmental stages from hatching through to metamorphosis are described.

TL;DR: Females of 50–63 mm carapace length, with one eyestalk removed, spawned viable eggs repeatedly within intermoult periods of 20–30 days indicating that one impregnation was sufficient to fertilize several batches of eggs spawned within one interMoult period.

TL;DR: The results of time-course conditioning trials indicate that there is an optimum conditioning interval during which the proportion of viable gametes is at a maximum, and when matings are accomplished before or after this optimum interval, reduced gamete viability results.

TL;DR: Essential amino acid levels in the plasma were found to be positively correlated with their levels inThe diets, while non-essential amino acids were not.

TL;DR: Treatment of tilapia larvae with l -thyroxine-sodium by immersion in 0.1 ppm solution markedly accelerated their development and enhanced their survival, and this effect of thyroxine, if confirmed in other species, may find applications in the improvement of larval rearing.

TL;DR: Bacterial flora in the gut of wild cultured prawns, Penaeus japonicus Bate, were investigated and the isolated strains were classified to genera and the Pseudomonas group was the dominant bacterial population.

TL;DR: It is suggested that diet exerts a strong influence on the composition of shrimp body lipids and that, contrarily, endogenous synthesis or modification occurs to a low degree.

TL;DR: It was revealed that total substitution of fish meal in trout diets was feasible, and that there was no need for further supplementation with sulphur amino acids in the type of compounded diets used in this study.

TL;DR: Rainbow trout (Salmo gairdneri ) with an initial average weight of 18 g were fed eight experimental diets with 26 and 35% protein and varying amounts of lipid for 112 days.

TL;DR: Nitrogen excretion increased with increasing protein and decreasing carbohydrate content in the diet, and nitrogen retention increased when the fish were fed a diet richer in protein, while the diet low in protein but rich in carbohydrate tended to cause poorer protein efficiency.

TL;DR: The extent of waste recycling in Asia is described and its potential for tropical, developing countries is emphasized.

TL;DR: Migration, growth in the natural environment, food and feeding habits, environmental tolerances, parasites, diseases and body composition of the juvenile grey mullet are discussed.

TL;DR: Larval survival of Crassostrea gigas in a hatchery rearing system was evaluated by diallel analysis, inferring that the rearing environment and the management of broodstocks both influence rearing success.

TL;DR: Artificial breeding of whitefish eggs in cold water at 1°C caused a delay in hatching of about 8 weeks compared with natural hatching, thus allowing the release of the larvae at a time when the density of zooplankton is about ten times higher and mainly juvenile stages of crustaceans needed by the whitefish larvae are present, one proven way of improving the survival rate ofwhitefish larvae in the natural environment.

TL;DR: Populations of Mytilus edulis which were attached to the floats supporting the fish cages at the University of Tromso's former experimental fish farm were found to have grown at a relatively high rate, and almost continuously, compared with populations taken from other populations in the area.

TL;DR: The effects of the carbohydrate and protein composition of compound diets on growth rate and on the amylase and protease content of the hepatopancreas have been studied in Palaemon serratus.

TL;DR: Efficiency of utilization of gross energy was between 40 and 43% for the basal diet and diets containing gelatinized maize starch, whereas it was reduced to about 31% by increasing the proportion of sucrose to 40%.

TL;DR: Using synthetic diets, hatchlings of Cirrhina mrigala (obtained through induced breeding) were fed graded levels of ascorbic acid: 0, 60, 300, 600, 900, and 1200 mg/kg diet for 240 days, suggesting an optimum requirement of 650–750 mg ascorBic acid/ kg diet in this early part of the life of the fish.