Showing papers in "Aquaculture in 1975"

TL;DR: The final effluent from the system is virtually free of inorganic nitrogen and is incapable of supporting further growth of marine life or of contributing to eutrophication of the receiving waters.

TL;DR: The proportion of males in single pair crosses between Tilapia nilotica females and T. aurea males was found to vary between 50 and 100%, and the results did not reveal heterosis.

TL;DR: Passively transferred trout anti- Vibrio anguillarum serum provided protection against experimental vibriosis in trout for more than 2 months.

TL;DR: It is suggested that M. rosenbergii may be able to conserve salt in dilute media by producing blood-hypoosmotic urine, which is generally similar to that of other brackishwater animals, but in their ability to hyperosmoregulate effectively in fresh water they more closely resemble fresh water species.

TL;DR: The aim of this study is not only to ensure the availability of mullet semen anywhere and anytime it is needed, but also to contribute to the international cooperation of cross breeding of grey mullet in the future.

TL;DR: Based on laboratory experimental evidence that the shrimp certainly eat some kinds of plant material, the significance of their association with grass beds and marshes of the estuaries is discussed.

TL;DR: The ammonia quotient of Rhinomugil corsula in air-saturated water is higher at lower levels of activity, indicating relatively higher protein utilization in less active fish and the correlation between the trends of R. Q. and A.Q. increases with decrease in ambient oxygen indicating an increase in anaerobic metabolism and protein utilization.

TL;DR: Controlled mass culture of brine shrimp larvae to the adult stage has been extremely difficult until now; the literature on the subject is reviewed and a new tech-nique of high density culturing at the pilot-stage is described.

TL;DR: Comprehensive information on the parasite fauna of mullets is still restricted to a few regions: 15 species of parasites have been listed from Black Sea mullets, 34 from the eastern Mediterranean, 20 from the northern Red Sea and 19 from theNorthern Gulf of Mexico.

TL;DR: Methods for induced spawning and artificial incubation of Tilapia nilotica and T. aurea are described, required for the production, in aquaria, of F 1 hybrids between the two species.

TL;DR: Experimental results, such as initial success of induced spawning in 1963, record of two fingerlings reared to stocking size in 1968, production of 21 688 fingerlings in 1973 when preliminary techniques of mass propagation were established, and unsolved problems are summarized in this paper.

TL;DR: It is evident that more research is necessary before the potential value of these hybrids for fish farming can be properly assessed, as they were produced from the following members of the salmon family.

TL;DR: Brook trout, rainbow trout, and Atlantic salmon were acclimated to sea water and placed during autumn in floating cages in a concrete tide pool and most of the fish died in a 4-day period during early January when the water cooled to −0.7°C.

TL;DR: Preliminary laboratory experiments indicate that full maturation of the ovaries in the prawn Penaeus orientalis can be induced by the removal of only one eyestalk.

TL;DR: A comparative study of five populations of fishes from both the Red Sea and Mediterranean Sea and Siganus argenteus (Quoy and Gaimard), including ecological and behavioural aspects that may have significance in determination of suitability of the species for aquaculture.

TL;DR: Individual hypotheses on the reasons for problems associated with oocyte quality, larval foods, bacterial contamination, environmental control and facility design, are discussed.

TL;DR: The inability of C. labrosus to develop a long-term hypoosmoregulation in fresh water is referred to salinity preferences which probably limit the upstream penetration of this species.

TL;DR: The period of establishing first feeding is the most critical for larvae, and the rate of yolk sac absorption, age at first feeding and their survival and growth when fed different food organisms, were studied.

TL;DR: It was found that the preferences change with the size-group of mugilids, and copepods were found to be the most important food item in the gut contents, at all times of the year and at all sizes of mullets taken in the neuston.

TL;DR: It was found that cold-branding with liquid nitrogen was the most rapid and inexpensive method for marking salmonids; after about one year between 87 and 92% of the fish can be identified.

TL;DR: The paper reports on the induction of ovarian maturation out of season by manipulation of photoperiod and temperature cycle, and recommends conditions of constant temperature control at 21°C and photoper Period 6L 18D for the best results using fish with oocytes in the refractory period.

TL;DR: In the first year, production varied from 3 889 to 5 600 kg/ha/year and this rose to an average of 8 200 kg/a/year with a maximum of 9 389 kg/fa/year in the second year.

TL;DR: A simple, inexpensive modular system for raising juvenile lobsters is described, constructed in modular fashion from Lucite racks and plastic trays, that can accommodate a wide range of animal sizes.

TL;DR: Results of some preliminary experiments are presented which indicate that the population of Tilapia mossambica in seawater ponds might be controlled by allowing unlimited numbers of Elops hawaiensis into the ponds.

TL;DR: Blood from fish immobilized by stunning gave a better picture of the resting state than samples from anaesthetized fish, and immediate centrifugation of blood samples is necessary for reliable plasma K + values.

TL;DR: Despite heavy losses from overcrowding, fast currents and turbulence, growth was sufficiently good for some rope populations to produce marketable crops after about 16 months, suggesting that crops could be harvested below the present marketable size.

TL;DR: A review of the literature concerning phenotypic and genetic parameters for economic production traits in salmonids show that very few estimates are available, but the possibilities for genetic gain in, for example, growth rate are extremely good even if conservative estimates are considered.

TL;DR: A tentative key for species determination based on the myogen electrophoretic pattern of five species of grey mullet is given, which decreased during growth of all species, and became faint in adults of L. provensalis and L. ramada.

TL;DR: The results suggest that anesthetic action may be intensified in fish acclimated to conditions other than those near their physiological optima.