摘要:

In contrast to the low percentage of survival to be expected when, bluegills and largemouth black bass are planted in streams and old lakes, high percentages are obtained when these fish are planted in new ponds. Survivals of 75 to 100 per cent were obtained when bluegill fingerlings alone were planted in ponds in which food was plentiful. In bluegill bass combinations, survivals of 76 to 85 per cent were obtained for bluegill fingerlings. Percentages of survival for largemouth black bass in bluegill bass combinations were 75 for fingerlings and 80 to 90 for advanced fry. Recognition of the high survivals of these species forms one of the bases for an intelligent stocking program for new ponds.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[63:POSOBL]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

Reported growth-rate studies show that largemouth black bass grow faster in the South than in the North. Southern fish make their fastest growth in length during their first year, northern fish during their second year. Fish in virgin waters grow faster than fish in more mature waters. A specimen taken from a newly dug borrow pit in Louisiana grew at the average rate of 2.5 ounces per month.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[68:PGROLB]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

An increased growth rate, too great to be accounted for by any normal growth fluctuation, was shown to have occurred in all age groups of rock bass, following the reduction in the population by poisoning the fish of the south basin of Booth (formerly called Standard) Lake, Michigan. Additional information was obtained in 1941 and 1942 which made it possible to analyze the change in growth in weight as well as length. Not only did the length and weight increase, but the mean coefficient of condition, K, also increased. Thus it appears that reduction in numbers is one solution to the problem of lakes with large populations of stunted fish.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[72:FSOTIG]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

In the course of a study of the importance of charrs as predators on the red salmon of the Karluk watershed on Kodiak Island, Alaska, during the summers of 1939 to 1941, it became apparent that two distinct species of charrs were present. Results of tagging experiments, of stomach examinations of thousands of charrs, and of the analysis of comprehensive morphometric and meristic data made it easy to separate the dolly varden charrs from the red lake or alpine charrs at Karluk. These species have often been confused with each other, and may show intergradation in other parts of the world. At Karluk, however, the dolly varden charr, Salvelinus malma (Walbaum), is typically anadromous, spawns in streams, and has fewer than 20 gill rakers and fewer than 35 pyloric caeca. The red lake or alpine charr, Salvelinus alpinus (Linnaeus), of the same region is not anadromous, spawns in the lake, and has more than 20 gill rakers and more than 35 pyloric caeca.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[79:TAHOTC]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

A creel census was conducted on the Deerskin river to determine the results of stocking trout of legal size. The stocking was done in December and May and consisted of 1,002 brook and 1,621 rainbow trout. A yield of 3,438 trout was obtained. Native fish made up 71 per cent of the catch. Native brook trout supplied the most fishing (50.5 per cent of the total). All stocked fish, especially the larger rainbow planted in December, were inferior in condition and sporting value. There were no reports of either species carrying over to the second season.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[92:TROPLT]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

The production of fish in ponds can be increased by the use of organic fertilizers such as cottonseed meal and soybean meal, and productivity can be further increased by the addition of superphosphate to these meals. From the standpoint of fish production alone, such organic materials are worthy of consideration as fertilizers for fish ponds.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[97:OMAFFF]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

Fisherman counts on two pre-impoundment areas in the Tennessee Valley are compared with similar counts on completed reservoirs. On the basis of these counts it is estimated that fishing in the Cherokee Reservoir area will increase almost 50 fold 5 years after impoundment; on the Watts Bar Reservoir area fishing is expected to increase 10- or 15-fold several years after impoundment.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[103:TEOIOF]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

Reighard's chub has come to be one of the most important species of the group since the serious decline in abundance of the larger representatives of the genus Leucichthys in Lake Michigan. An understanding of the biology of as many species of chubs as possible is essential if further depletion and the collapse of the fishery are to be prevented.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[108:TAGABD]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

On August 26 and 27, 1941, collections of young white perch, Morone americana (Gmelin), were made at 8:30 and 11:30 p.m. and at 2:30 and 4:30 a.m. when the fish had moved over shoals. The stomach and intestinal contents of 50 specimens in each collection were examined; estimates were made of the fullness of the stomachs and of the volume of the various food organisms. The position of the food was diagramatically noted. The stomachs examined from the 8:30 p.m. collection held considerable food, but those from subsequent ones held increasingly less, until the 4:30 a.m. collection, when about 95 per cent of the fish examined had empty stomachs. The most important food organisms in the 8:30 p.m. collection were Cladocera, chironomid larvae, and a certain adult of the Hymenoptera. In the following collections, the volume of Cladocera gradually decreased in the digestive tract and such forms as Hyalella, ant adults, midge pupae, and mayfly nymphs increased greatly. In the several collections there was a marked tendency for the important food organisms to occupy a similar position in the digestive tract of all fish in the same collection. A well defined progression of the main food organisms could be followed through the digestive tract from the initial collection to the last.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[136:FPIYWP]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor

摘要:

An experiment was designed and carried out to test the effect of covered troughs upon the growth rate of cutthroat trout. Analysis of the resultant data showed the trout in open troughs to have a significantly greater growth rate than those in covered troughs. The growth rate in open troughs was greater by 13.8 per cent.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1942)72[145:TEOCHT]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1943

数据来源: Taylor