摘要:

ABSTRACTFish farm and field trials have been conducted into the longevity and reliability of fluorescent pigment spray marking on brown trout and Atlantic salmon. These have shown that the technique produces high quality marks for a minimum of 20 months for brown trout and 7 months for Atlantic salmon. In addition a minimum size of 6.8 cm for the successful marking of brown trout fry has been established. High mortalities were found when the technique was used on fish which were subject to stress. Causes of stress are discussed and mortality rates of<1% have now been achieved.

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00036.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

ABSTRACTHatchery‐reared brown troutSalmo truttaL. (length 23–26 cm) were stocked in the Afon Taf, South Wales. The effects of ‘spot‐’ and ‘scatter‐planting’ and of stocking at 1 and 4 weeks prior to the start of the angling season were investigated. Data on the percentage recapture and post‐stocking movements of the trout were obtained from tag returns.Higher percentage recaptures were recorded for ‘spot‐plantings’ (65% and 31%) than for ‘scatter‐planting’ (16%). Stockings made 1 week before the start of the angling season yielded better returns (17.1%) than those made 3 weeks earlier (2.2%). Neither ‘spot‐’ nor ‘scatter‐planting’ resulted in stocked fish contributing to the catch for an appreciably longer period of time.The majority of trout stocked were caught in the area of stocking irres

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00037.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

ABSTRACTFish stocks at a site in the upstream reaches of the River Soar, a lowland river in Leicestershire, showed a marked alteration following river channel works associated with a land drainage improvement scheme. The density and standing crop of all ‘large‐sized’ fish species present showed reductions of 15–100% between a 6‐month pre‐drainage period and a 3‐month post‐drainage period. The density and standing crop of the total population were reduced from means of 0.160 fish m−2and 39.0 g m−2during the pre‐drainage period to means of 0.048 fish m−2and 9.6 g m−2during the post‐drainage period, reductions of 70% and 76%, respectively. It is suggested that modifications to physical features of fish habitat, particularly the elimination of in stream cover, were largely responsible for t

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00038.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00039.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00040.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Book reviewed in this articleSalmonid Broodstock Maturation By T. NOSHO (Ed.).The Haig Guide to Salmon Fishing in Scotland. By DAVID BARR (Ed.).Fisheries Management. Ed. by ROBERT T. LACKEY and LARRY A. NIELSON.

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1982.tb00041.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY