Showing papers in "Aquaculture in 1972"

TL;DR: The admixture of certain protein sources together with additives should ultimately have the special pattern of amino acid distribution similar to that of the prawn.

TL;DR: Results from these studies indicated that 28–32% was the optimal protein level and that the addition of starch to the diet enhanced growth whereas supplemental glucose caused a reduction in weight gains.

TL;DR: Parenteral immunization with adjuvant resulted in high and persistent antibody titres in the serum, while only small amounts of antibody were found in the intestinal and cutaneous secretions, and no circulating antibodies were detectable one year after injection with bacteria in saline.

TL;DR: The concentration of four heavy metals (copper, zinc, cadmium and lead) has been measured in a number of shellfish collected from coastal areas of Scotland and conclusions are made regarding geographical variation.

TL;DR: The purpose of this paper is to discuss water treatment processes and their combinations in water reuse systems of salmonid (salmon and trout) hatcheries.

TL;DR: It is suggested that further studies be performed to ascertain the areas of origin of these metals and to establish the areas in which concentrations of metals found in the fish sampled were highest.

TL;DR: Effectiveness of grass carp in control of water weeds depends on a number of factors, the most important being water temperature species composition of plants, individual weight of fish and stock density, which may contribute to the limitation of water overgrowth.

TL;DR: Preliminary studies suggest that Tilapia species are suitable for culture in the heated effluents of power stations, and their main value would seem to be as food fishes.

TL;DR: Post-metamorphosis turbot have excellent qualities for the purpose of marine fish cultivation and were very easy fish to manage; they did not suffer damage on handling and were easy to maintain at high density.

TL;DR: There appears to be little difference in concentration of any one metal between areas for the same species of commercial fish collected from Scottish waters, but it is suggested however that there may be a difference in trace metal content of plankton feeding fish and bottom feeding fish.

TL;DR: The ‘temporary environmental’ regression was positive during the warm summer season, but nil during the cool late fall and winter, and the presence of ‘genotype-season’ interaction was demonstrated.

TL;DR: A decline in condition index during the summer was found in both species, indicating spawning activity and both species showed good growth rates through the summer.

TL;DR: The initial experiments in rearing rabbitfish in sea water indicate that this fish may be suitable for commercial cultivation and the growth of rabbitfish under conditions of high salinity is presently being investigated.

TL;DR: Under outdoor conditions, the sewage enrichment of sea water in 400-liter tanks stimulated the growth of a variety of microalgae which were usually dominant in the water before enrichment, and the possible control of species composition was demonstrated using different combinations of nutrients.

TL;DR: Sperm stored at −79°C showed little or no motility on thawing and were incapable of fertilisation, but thawed samples from 3 different fish showed strong sperm motility and mean fertilisation and hatching successes.

TL;DR: A trichodinid ciliate and a monogenean trematode, Gyrodactylus unicopula, were found to be involved in marine flatfish mortalities.

TL;DR: Results suggest that fish on diets of natural foods grow much more rapidly than fish receiving a diet of artificial foods.

TL;DR: A technique is described which allowed about 23% of late yolk sac lemon sole larvae to be reared to metamorphosis, and early larvae were fed on mussel trochophores, followed by rotifers until newly hatched Artemia nauplii became acceptable for growth to meetamorphosis.

TL;DR: Infected mussels have a characteristic orange coloration and the sporocysts are strikingly motile thus facilitating recognition of this parasite even at the macroscopic level, and this parasite would be responsible for minimal losses in natural and cultured mussel populations.

TL;DR: Growth results of these high density cultures are comparable with the best growth data reported in literature, however the latter however refer to low-density experiments.

TL;DR: Modern liberations of as well fry as older fish, as to size and number leveled to the natural conditions of the streams and to the stock present before, have however shown satisfactory results.

TL;DR: It was found that the speed of growth is low during the third year of life in the males and during the fourth year in the females and this decrease is related to the start of the development to maturity of the gonads.

TL;DR: The internal micrococcal flora of 23 healthy European lobsters, Homarus vulgaris L., was investigated and the lobster pathogen, Gaffkya homari, was not found and a new solid medium giving a more abundant growth of the bacterium is described.

TL;DR: Eggs and larvae of plaice, cod and herring apparently seemed unaffected by concentrations up to 10 ppm, but concentrations of 100 and 50 ppm delay and stop development ofPlaice eggs in an early stage.

TL;DR: Observations made in the breeding season 1972, may throw new light on the reasons for the high mortality observed at the end of the yolksac stage, when the larvae should start feeding.

TL;DR: Evidence shows that live L. rivalis is markedly superior in growth rates of young fish fed on three separate forms of Lumbricillus rivalis — frozen, freeze-dried and live.