Showing papers in "Aquaculture in 1976"

TL;DR: Ten species of penaeid and one caridean prawn were exposed to ammonia (as ammonium chloride) and nitrite and nitrate (as sodium salts) in a series of acute and chronic toxicity tests and the importance of inorganic carbon in sea water in relation to mortality of cultured prawns is discussed.

TL;DR: Current knowledge and priorities for future work are assessed under the headings: palatability and physical dietary structure, lipids and sterols, protein, carbohydrate, minerals, vitamins and larval feeding.

TL;DR: The proportion to which the food was made available by the fish appeared to be low in comparison with warm-blooded animals, but conversion of available energy into growth of fish takes place at a high efficiency.

TL;DR: The acute toxicity of un-ionized ammonia, nitrite, and nitrate to 50–76-mm fingerling channel catfish ( Ictalurus punctatus) was investigated using a static bioassay system at 22, 26 and 30°C.

TL;DR: Rainbow trout learned quickly to operate a trigger to deliver dry food and showed a peak of feeding at dusk, but also appreciable nocturnal feeding, and could therefore be controlled at about the manufacturers recommended feeding levels.

TL;DR: Eight batches of hatchery reared V. decussata were reared to market size at two sites in England and one in Wales and it was estimated that after 3 years a population planted at 10 mm shell length would have reached about 50 mm.

TL;DR: In this article, the biology and feeding habits of the cichlid fish Tilapia melanotheron in a small West African lagoon is analyzed, and three alternative methods to increase the quantity of the fish caught in the lagoon are briefly discussed: (a) setting up of an “acadja” fishery; (b) stocking with juvenile Tmelanotheron ; (c) stocking of Mugil spp fry (Tilapia/Mugil polyculture) The availability of Mugili spp fries along the coast makes the

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 in selective breeding trials.

TL;DR: Prawns fed diets supplemented with 4% sardine oil or 4% clam oil, rich in ω3 PUFA had a high moulting rate, the best growth and a high level of ω 3 polyunsaturated fatty acids, indicating that regulation of palmitic acid synthesis could be exercised through desaturation and chain elongation.

TL;DR: The use of dried prawn meal as a high quality reference protein in the nutrition of juvenile Penaeus indicus was investigated through short term growth and feed efficiency trials and showed that isonitrogenous substitution could be effected to an apparent optimal ratio of 60% fish meal: 40% prawn Meal protein.

TL;DR: The body fat content of the experimental fish did not exceed that of wild fish even at the highest dietary energy level, and protein utilization was superior to that of turbot given diets containing 500 g protein/kg.

TL;DR: A component of rainbow trout body mucus was found to be indistinguishable from serum immunoglobulin by immunodiffusion and immunoelectrophoresis and it has been demonstrated that heat-stable and heat-labile components are necessary to prevent the growth of Vibrio anguillarum in in vitro experiments with trout immune serum and mucus.

TL;DR: The effects of different levels of salinity on the growth, food intake and food conversion efficiency of young grey mullet were studied and when a constant ration was given the percentage conversion efficiency was found to decrease with increasing salinity.

TL;DR: Growth, feed conversion and survival were determined for juvenile Macrobrachium rosenbergii held in tanks under semi-controlled environmental conditions, and it was suggested that naturally occurring algae contributed substantially to the prawns' nutrition.

TL;DR: It is suggested that ω3 fatty acids are important in the nutrition of M. rosenbergii and that prawn diets might be made more effective by increasing the relative proportion of ω 3 fatty acids in their composition.

TL;DR: In this paper, static bioassays of up to 8 days duration were performed on 10-14-day-old larvae ranging in weight from 80 to 140 μ g/larva.

TL;DR: Yields of macroscopic marine algae were grown and harvested continuously during 1974 in Fort Pierce, Florida and are as high as those achieved by mass cultures of microscopic marine algae, or by fast growing commercial crops such as sugar and rice.

TL;DR: The increasing demand and rising price of raw Gracilaria, and agar derived from it, are likely to encourage Gracilarian cultivation not only in Taiwan but also in other developing countries with sites suitable for its cultivation.

TL;DR: Under present dietary regimes, there appears to be limited capacity for biosynthetic interconversion of essential fatty acids to longer chain polyunsaturates of the same typed series.

TL;DR: Heritability of mortality in eggs, alevins and fry were estimated using data from salmon, sea trout and rainbow trout to find the maternal effect was rather large for uneyed eggs and eyed eggs, while it was low for alevin mortality.

TL;DR: Fish lipid fatty acid composition, feed conversion efficiency and fish mortality are discussed and diets supporting rapid fish growth were those containing high levels of ω3 FA and highω3 and low ω6 FAs.

TL;DR: After 5 months' growth following grading, the fish graded at 6 months old showed better growth than controls, and the other age-at-grading groups showed growth equal to or less than that of their controls at the end of the experiment.

TL;DR: The nature of the animal taxa that are the most probable candidates for an intensive, commercial aquatic animal husbandry industry is considered and a characterization is presented of those biological criteria that lend the species the necessary physiological and genetic malleability to be adapted and molded into a domesticated race.

TL;DR: Higher mortality due to cannibalism was observed when larvae were underfed, but an excess of Artemia caused fouling and stressed the larvae.

TL;DR: Aquarium-held bigmouth buffalo were fed the blue-green alga Spirulina platensis (Nordstedt) at a daily rate of 29 g dry weight/kg body weight for 28 days; growth and food conversion were similar to those found forbigmouth buffalo.

TL;DR: It is shown that a relatively small reduction in salinity at the marine site can give appreciable improvements in survival rates during acclimation by smaller fish, thus rainbow trout of 15 g have routinely been put directly into sea cages at a salinity of 22% with mortality levels of from 1 to 8%.

TL;DR: Prawn diseases encountered by the authors during research programmes on prawn cultivation are described and discussed, finding a variety of seawater penaeid species, the freshwater Macrobrachium rosenbergii, and the seawater caridean Palaemon serratus were affected.

TL;DR: Future large-scale intensive seaweed culture systems are evaluated through the use of a case study approach and the problems that must be addressed and resolved are indicated in the context of their scientific, technical and economic impacts on such culture systems.

TL;DR: Size was found to be the most important factor in seawater adaptation of underyearling Atlantic salmon and Optimal growth in the experimental temperature and photoperiod regimes occurred at 15°C and at thePhotoperiod with the longest period of increasing day length.

TL;DR: The eggs were striped from Dicentrarchus labrax and artificially fertilized and the embryos and larval development are described with emphasis on organogenetic chronology.