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At least 217 records · Page 12Linked to original sources
USGS1977

Abnormal tooth development in a sea lamprey

Sea lampreys en route to their spawning grounds have been captured at mechanical or electrical structures that have been in operation for 1 to 27 spawning seasons (1949-75) on some 167 tributaries of the upper Great Lakes; more than 750,000 were taken in 1949-70 (Smith 1971). Among these lampreys (all of which were routinely examined at the time of capture) was one female (length, 434 mm; weight, 130 g) with markedly underdeveloped teeth. It was captured in May 1968 at an electrical barrier in the Ocqueoc River, a Michigan tributary of Lake Huron

Progressive Fish-Culturist↗
USGS1977

Relative yield of two transferrin phenotypes in coho salmon

Experimental groups of coho salmon (Oncorhynchus kisutch) of transferring types AA and AC were compared to determine relative growth and survival before release, yields from the fishery, and returns of fish to the hatchery as 2- and 3-yr-olds. In the hatchery, growth was faster and survival higher in the AA than in the AC types. However, yields of AA and AC types were equal, although the yield of AC types as 3-yr-olds was greater than that of AA types because more of the AA males matured in 2 years. We concluded that it would be futile to attempt to increase the yield of coho salmon by maximizing the frequency of biochemical phenotypes that display only a temporary advantage over other types.

Progressive Fish-Culturist↗
USGS1977

Rotational line crossing: An approach to the reduction of inbreeding accumulation in trout brood stocks

A system is presented for maintaining trout brood stocks for long periods with levels of inbreeding accumulation lower than that experienced in random mating populations of equal size. The system requires the formation of three or more distinct breeding lines. Brood stock generations are advanced by a systematic mating scheme in which females of each line are mated to males of a different line. Eggs for hatchery production may be obtained from matings either within a single line or between lines. An opportunity for improving the breeding population is provided through selection of individual fish to be used in the production of the next brood stock generation. The requirement for increased handling of brood stock is not considered to be serious.

Progressive Fish-Culturist↗
USGS1977

Survival of monosex grass carp in small ponds

Little information is available on the survival of grass carp (Ctenopharyngodon idella) in ponds &mdash especially on the survival of fry to large fingerling stage, during the time when the most mortality would be expected. Development of monosex (all female) grass carp at the Fish Farming Experimental Station by the technique of artificial gynogenesis (Stanley et al. 1975) enabled us to observe survival to the large fingersling stage under several stocking densities and pond conditions. These limited observations, made incidentally to other studies, may provide clues for the development of management techniques to reduce mortality. Monosex fry were used in these observations, but there is no reason to suppose that survival of bisexual fry would have been different.

Progressive Fish-Culturist↗
USGS1977

Chemical composition of blood and bile of the shovelnose sturgeon

Samples of gallbladder bile and blood from shovelnose sturgeons (Scaphirhynchus platorynchus) collected from the Chippewa River, Wisconsin, contained concentrations of Na + , K + , Ca ++ , Mg ++ , Cl - , inorganic phosphate, and total cholesterol closely comparable with those reported for similar samples from other species of freshwater sturgeons.

Progressive Fish-Culturist↗
USGS1978

Nutritional requirements and feeding of selected coolwater fishes: A review

A review was made of published and unpublished studies on nutritional requirements , diets, and feeding of selected coolwater species of fishes : yellow perch (Perca flavescens), European perch (P. fluviatilis), walleye (Stizostedion vitreum), smallmouth bass (Micropterus dolomieui), northern pike (Esox lucius), muskellunge (E. masquinongy), and the northern pike x muskellunge hybrid. The published information on nutritional requirements was meager, including only preliminary studies of iodine and vitamin A. Most of the results of the feeding trials were unpublished and lacked experimental control so that the effect of diet was not always clearly demonstrated; however, the results were tabulated and summarized. Results indicated that considerable research is needed. The compositions of diets were given when available.

Progressive Fish-Culturist↗
USGS1978

Discharge of solids from fish ponds

Water samples were collected from effluents of fish ponds and analyzed for settleable, nonsettleable, and suspended solids . Fish biomass in ponds was not consistently associated with amounts of settleable or nonsettleable solids , but was correlated with amounts of suspended solids . The amount of solids discharged was relatively small, suggesting little or no pollution of receiving waters.

Progressive Fish-Culturist↗
USGS1978

Effects of dietary addition of vitamins C and D 3 on growth and calcium and phosphorus content of pond-cultured channel catfish

Fingerling channel catfish, Ictalurus punctatus, were fed one of three diets: one deficient in vitamin C (ascorbic acid), one deficient in vitamin D 3 (cholecalciferol), or one containing both vitamins. Semimonthly from May to September and monthly from September to February, calcium and phosphorus were determined in eviscerated bodies and fat-free skeletons by neutron activation analysis. Body weight gains, survival rate, and feed conversion rates were determined for the May to September period. Fish on the three diet regimens showed no significant difference in weight gain, feed conversion, or survival. Interactions between sampling date and diet indicated no correlation between vitamin C or D 3 and the calcium and phosphorus in eviscerated bodies and fat-free skeletons of the fish.

Progressive Fish-Culturist↗
USGS1979

Toxicity of fishery chemicals to the asiatic clam, Corbicula manilensis

The Asiatic clam (Corbicula manilensis), a species introduced into U. S. waters, has spread rapidly, and its ability to survive, reproduce, and spread has caused concern. Aquatic biologists suspect that the clams may crowd out indigenous mollusks, and the animals sometimes plug water intakes and leave shell deposits that interfere with sand and gravel operations. The toxicity of 20 commonly used fishery chemicals to the Asiatic clam was determined to evaluate hazards to a nontarget aquatic invertebrate and to assess the potential of the chemicals for controlling clam populations. Among six piscicides and two lampricides tested, antimycin was most toxic to the clam; the 96-h LC 50 was 0.065 mg/L. Among three therapeutants and two disinfectants tested, nifurpirinol was the most toxic; the 96-h LC 50 was 7.60 mg/L. All of the compounds were less toxic to the clam than to fish. As a nontarget organism, this clam would be safe in water treated with any of the tested fishery chemicals at recommended use pattern concentrations. None of the chemicals have potential for controlling unwanted populations of these clams.

Progressive Fish-Culturist↗