The level of stress imposed by population pressure, handling and live transportation on planted catchable-sized rainbow trout in a northern Utah stream was examined. Production of adrenocorticotrophin, as measured by interrenal ascorbic acid and serum cortisol levels, did not occur in transported or planted fish. Dead or moribund fish collected from stream or live boxes comprised 13 percent of the 2,000 fish planted. Aeromonas salmonicida, the causative agent of furunculosis, was isolated from 41 percent of 106 moribund fish sampled. In addition, 39 percent of the samples exhibited bacterial growth other than A. salmonicida. Apparently, handling, transportation, and planting did cause low levels of stress sufficient enough to induce stress-mediated diseases such as furunculosis.

No description available.

The Pigeon River suffered major water quality degradation from 1908 through the 1980’s from paper mill effluent which resulted in the extirpation of many native fish species. Mill modifications have cleaned the effluent to the degree where some native species are recolonizing many areas of the river. In 2001, the Pigeon River Restoration Project was initiated to re-introduce native non-game species which have been unable to return of their own accord. In addition to relocation of selected suitable species, captive production of the tangerine darter (Percina aurantiaca) has been attempted since current translocation methods have proven impractical due to the small number found in the Pigeon River system. It is anticipated that, through hatchery propagation, sufficient numbers of tangerine darters might be produced for re-introduction. This method has seen limited success with other Percina species. Using brood stock of tangerine darters collected from the Pigeon River above the paper mill, three attempts to spawn and propagate tangerine darters were conducted at the Conservation Fisheries Incorporated (CFI) facility in Knoxville, TN. In the first trial, no eggs were spawned; the second year produced approximately 290 eggs and larvae but relatively few survived. The third attempt produced approximately 331 eggs and larvae, resulting in approximately 85 juveniles, but grow-out was problematic; future propagation efforts will target optimum grow-out densities as well as determine the nutrition requirements for larval and juvenile tangerine darters.

No description available.

Thèse de doctorat : Sciences agronomiques : INPL : 2008. / Titre provenant de l'écran-titre.

Thesis (Ph. D.)--Ohio State University, 2003. / Title from first page of PDF file. Document formatted into pages; contains xvii, 114 p.; also includes graphics. Includes abstract and vita. Advisor: David A. Culver, Dept. of Evolution, Ecology, and Organismal Biology. Includes bibliographical references (p. 103-114).

This study investigates the population biology of horse mackerel inhabiting the Northeast Atlantic, their spawning grounds and migrations, and the degree of stock separation, with emphasis on the Southern and Western areas of the European shelf. The investigations involved the use of a wide range of methodologies and techniques, including age determination techniques, tagging experiments, the analysis and evaluation of commercial catch data, egg survey data, bottom trawl survey data, biochemical methods, morphometric methods, survey sampling methodology, and associated statistical analysis. Multivariate analysis of morphometric measurements, indicate that the horse mackerel that spawn on the Portuguese shelf (Southern area) are distinct from those that spawn on the Irish shelf (Western area). A distinction can also be made between the Portuguese horse mackerel and those from the Celtic Sea, English Channel and Northern Bay of Biscay. These findings are further supported by a study of otolith first ring distance, which also indicates that the Western and the North Sea horse mackerel are not significantly different from each other. Growth parameters of horse mackerel from the Western and Southern areas were estimated using length and age data and the resulting growth curves for the two areas are different. This result is primarily due to differences in the growth of the younger fish. In the Southern area the fish grow faster than in the Western area. These results provide evidence for the existence of a separate unit stock of horse mackerel off the Portuguese coast, which is reproductively distinct from other populations in the north-east Atlantic. The results froma study of plasma transferrin polymorphisms did not provide any evidence in support of these findings. The population structure and stock separation of horse mackerel in the north-east Atlantic are described and the implications for future management are discussed

The potential of the aquaculture in the Arabian Gulf has been evaluated. The factors t~at affect the selection of a species and system for the culture have been discussed. Among the indigenous species grouper (E. tauvina) and sea bream (M. cuvleri) give the best options. However, larval rearing is still the main problem in their large scale culture. Among the exotic species Tilapia (Sarotherodon) spp. give the best prospects. Open flow pond system seem to be the most acceptable system for use to operate in the Gulf area

No description available.

No description available.