摘要:

ABSTRACTIn an attempt to increase fish standing crop and improve angler‐catch, stocking was undertaken in the middle reaches of the River Derwent in Derbyshire using four cyprinid species. Each fish was marked with a dyespot, and nearly 2000 fish were introduced before the 1980–81 fishing season began. Bankside observations and catch return sheets were used to collect information on the number of marked and unmarked fish taken by angling. The percentage of captured fish that were marked reached 50% during summer 1980, although this was lower during winter 1980–81. A relatively small proportion of the fish caught were taken in angling matches.Anglers reported that the fishing had improved from‘poor’to‘good', and catches by a single angler in one day exceeded 20 kg. It is thought that the success of the operation was due to the fact that the stock fish were obtained from local rivers, were of a large size (>20 cm) and were introduced when the river was at normal level. The implications of the results on management options are considered, and it is suggested that the quality of sport demanded by anglers in rivers of this type may be most easily sustained by periodic stocking with su

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00406.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTFollowing an upsurge in the interest to anglers of American brook trout (Salvelinus fontinalis) an investigation was carried out in 1978 and 1979 into their growth and survival when reared in fish farm earth ponds and freshwater floating cages. Their performance was compared with similarly reared batches of rainbow trout (Salmo gairdneri). This work shows that American brook trout require more care and attention than rainbow trout when reared artificially and that their survival to 1 year old is lower, although growth rate in the first year compares favourably.

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00407.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTThe results of a series of experimental stocking programmes designed to assess the effects of fin‐clipping, fin‐damage and floy tags on the survival and growth of brown trout (Salmo truttaL.) are presented. Data indicate that even a single fin clip can seriously reduce survival and also retard the growth of fish. Trout released with extensive fin‐damage also exhibited poorer survival and growth patterns than their unmarked counterparts. The growth and survival of trout (≥ 18 cm) does not appear to have been altered by floy

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00408.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTSalmonid eggs were collected from spawning redds in the Norwegian rivers Alta, Gaula, and Driva in 1982. Their phosphoglucoisomerase (PGI; E.C. No. 5.3.1.9) patterns, as revealed by isoelectric focusing and histochemical staining, were compared to standard zymograms produced by Atlantic salmon (Salmo salarL.) and trout (S. truttaL.) white skeletal muscle extracts, and to the zymogram in salmon eggs of known origin. In salmon, the egg zymogram was identical with that of muscle. Two types of zymograms, identical with either salmon or trout muscle zymograms and thus regarded as species‐determinants, were observed among the eggs from wild fish. Their proportions in the three rivers were as expected from current knowledge of species composition. The present findings are related to previous reports on PGI expression in salmonids. The PGI zymograms are probably diagnostic keys to species for eggs from Norwegian stream‐dwelling salmonids, including Arctic char (Salvelinus alpinusL.). Some managemental implications of the present results are briefly discus

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00409.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00410.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00411.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00412.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Gutshop ' 8 1‐ Fish Food Habits Studies. Edited by G, M. CAILLIET and C. A. SIMENSTAD.Climate and Fisheries. By D. H. CUSHING.Acid Rain: A review of the phenomenon in the EEC and Europe. By Environmental Resources Limited.Control Processes in Fish Physiology. Edited by J. C. RANKIN, T. J. PITCHER and ROGER DUGGAN.Bacterial and Viral Diseases of Fish. Molecular Studies. Edited by JORGE H. CROS

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1984.tb00413.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY