Showing papers in "Aquaculture in 1988"

TL;DR: The findings of nutritional studies are reviewed and hypotheses relating the effects of dietary formulation and food type to digestive efficiency, nutrient storage and body composition are presented, and practical problems associated with the farming of cod are discussed.

TL;DR: Although some refinement of dosages of drugs is required, the Linpe method has proven to be a highly successful procedure for induced ovulation and/or spawning of cultured freshwater fish in China.

TL;DR: The protein efficiency ratio for fry and young tilapia decreased with increasing dietary protein levels, and the food conversion ratio increased with increasing protein levels in the diet, and thereafter decreased for diets containing 40% and 50% protein.

TL;DR: Mortality was high in an experimental group of rainbow trout fed estradiol as part of a sex reversal study and pathology included hypertrophy of the kidneys and liver and heavy accumulations of presumptive vitellogenin.

TL;DR: The persistence of oxytetracycline, an antibacterial agent, in bottom deposits from fish farms was investigated and the drug was found in concentrations capable of causing antimicrobial effects up to 12 weeks after administration.

TL;DR: In brook charr stocked at three different densities, growth rate, feed consumption and feed conversion efficiency decreased significantly with stocking density, while plasma cortisol, T4 and glucose levels showed a significant decrease with increased stocking density at the end of the first 30-day rearing period.

TL;DR: Results suggest that acute exposure to immobilizing doses of an anesthetic, MS-222, is an effective method of reducing endocrine and metabolic disturbances during transportation of red drum.

TL;DR: Diurnal maturation rhythm in the female red sea bream, Pagrus major, which spawns every day during the spawning season and has an asynchronous-type ovary containing oocytes at various stages of development, was studied by histological investigation of the ovary.

TL;DR: It is suggested that under prolonged periods of low food supply, oysters preferentially partition energy resources toward increasing shell weight and thickness over body tissue weight, which may be inhibited under conditions of low salinity.

TL;DR: A diet with 50% protein and 15% starch produced the best weight gain and food conversion rates at 15°C and 20°C, while a diet with 40%protein and 27% starch could be a better standard diet for sea bass at both temperatures tested.

TL;DR: The refining of methods for early detection of epidemic diseases, as well as investigations of possible causes of the high larval mortality reported to occur in the first 30–40 days of culture, are also required.

TL;DR: It was concluded that PPV is a more appropriate index for growth than PER in studies on a lean fish such as cod with a low-fat fillet and a fatty liver, and a reduced feeding frequency had no effect on feed conversion and PER whereas the weight gain and PPV were reduced.

TL;DR: An 8-week growth experiment was conducted to determine the dietary protein requirement of hatchery-produced juvenile white sturgeon (Acipenser transmontanus), and percent body weight increase, feed gain ratio, protein efficiency ratio, and productive protein value were significantly increased.

TL;DR: A more detailed investigation of the intra-species variation in rainbow trout indicated the existence of a genetic influence on the lysozyme levels.

TL;DR: Ten rainbow trout strains were evaluated during early growth from 30 g to 250 g on two diets — one based on plant protein (soybean and cottonseed meal) and the other on animal protein (fish meal) — formulated to be nutritionally isocaloric and isonitrogenous.

TL;DR: The embryonic development is described and the optimal conditions for the main embryonic stages are indicated, as found in studies over wide ranges of temperature and salinity.

TL;DR: It would appear that high population density affects young Arctic charr such that agonistic behaviour is inhibited and schooling behaviour stimulated, and growth rate was observed to be positively correlated with stocking density.

TL;DR: Results indicate that T. zillii can efficiently utilize carbohydrates and lipids as energy sources and can be substituted for one another at a rate of 2.25:1 commensurate with the CHO:L physiological fuel values.

TL;DR: There was no significant effect of light on survival during the resorption of the yolk sac and total darkness gave a significantly higher percent of normal larvae than any of the other three light regimes.

TL;DR: Few differences were found between groups fed diets A, B and D in feed conversion, protein efficiency ratio (PER) and protein productive value (PPV).

TL;DR: The possibility of including crude lupin seed meal in trout diets at levels as high as 30% of dietary protein was demonstrated and heating did not improve nutritional quality.

TL;DR: Dry meat weight:dry shell weight ratio was a more suitable index for assessing the condition of oysters provided available food and water temperature were the principal factors affecting growth.

TL;DR: The results indicate that the fish did not experience a high-level state of chronic stress, not even at the high density, and the upper density limit for Atlantic salmon post-smolts appears to be higher than the highest one investigated here.

TL;DR: The cholesterol-cellulose pellets that are 25–100% cellulose are potentially useful with ripe fish that require a rapid GnRH-A stimulus for final egg maturation and spawning and the 95 or 100% cholesterol pellets may be most suitable for sustained release in fish requiring days for final maturation of the ovary or in fish spawning on several successive days.

TL;DR: This analysis suggests that aquaculturists can raise dissolved oxygen levels by increasing algal growth, not necessarily by reducing algal biomass.

TL;DR: The isolation and purification of Bonamia ostreae (Ascetospora), an intrahemocytic protozoan parasite of Ostrea edulis, have been achieved according to an original protocol and showed good retention of infectivity and ultrastructural morphology.

TL;DR: It is observed that the integration rate in the microinjection of the human growth hormone gene into the germinal disc and the development of 90-day live transgenic tilapia is lower than in mammals.

TL;DR: Larval prawn Penaeus monodon exhibited a progressive increase in nitrite tolerance as the larva metamorphosed from nauplius to the postlarva stage, and a “safe level” of nitrite was estimated at 1.36 mg/l NO2N on the basis of 96-h LC50 for postlarvae.

TL;DR: Although feeding incidence increased with age of the larvae, a higher incident rate was observed for larvae held in continuous light from day 3, and Larval size on day 7 showed that continuous lighting gave improved results.

TL;DR: Pellets, pumps and repeated injections produced multiple spawnings in sea bass, but the pellets were more reliable, cheaper, and less stressful to the fish.