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  • 1
    Digitale Medien
    Digitale Medien
    Efficiency of Electric Fishing for Salmonids in Relation to River Width (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 12 (1981), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The efficiency of electric fishing for salmonids was found to decrease with increasing river width. The results demonstrated that mean efficiencies in excess of 50% could be obtained using two anodes up to a river width of about 6.5 m and using three anodes up to a river width of about 11 m. Yearling and older fish were captured more efficiently than fry at equivalent river widths and this was discussed in relation to differences in their behaviour.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1981.tb00010.x
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  • 2
    Digitale Medien
    Digitale Medien
    Evaluation of Carlin tagging as a mark-recapture technique for estimating total river runs of salmon smolts, Salmo salar L. (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 22 (1991), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Mark-recapture experiments using Carlin tags on migrating wild smolts in the River Bush indicated that 16·4% were not recovered under total trapping conditions. The experimental procedure was also found to delay the migration of the smolts by varying amounts. The implications for the use of this technique as a means of assessing both smott run sizes in partially trapped rivers and smolt migration speeds are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1991.tb00528.x
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  • 3
    Digitale Medien
    Digitale Medien
    Experiments on the Descent and Feeding of Hatchery-reared Salmon smolts (Salmo salarL.) in the River Bush (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 15 (1984), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Marked hatchery-reared smolts were released into the River Bush on the 1 May and 19 May 1980. and the time for their descent to trapping facilities was monitored. Of the smolts recaptured in each experiment 56.2% and 75.8% respectively descended the 3.5 km to the traps within 48 h, and the overall patterns of their downstream movements were found to be correlated to that of wild smolts. Smolts migrating from control tanks did so more slowly than those released into the river, and were not correlated with the movements of wild smolts.The feeding of recaptured hatchery smolts was compared with that of wild smolts for up to 11 days after the start of each experiment. It was found that most invertebrate groupings were not consumed at significantly different levels in the two groups, and that hatchery-reared fish began feeding on invertebrate food within 9 hours of release.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1984.tb00578.x
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  • 4
    Digitale Medien
    Digitale Medien
    Yield to Anglers of Spring and Autumn Stocked, Hatchery Reared and Wild, Brown Trout (Salmo trutta L.) (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 10 (1979), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Tagging experiments are described where hatchery over-yearlings and similar sized wild brown trout were spring-stocked in two small angling lakes. This was followed in the autumn with a stocking of hatchery fingerlings and wild fish. The spring-stocked hatchery fish gave the best return to anglers of 9.3% over the first two seasons, while the autumn-stocked hatchery fish apparently suffered heavy over-winter mortality — giving a return of only 1.3% over a comparable time period. Wild fish gave low return rates of 2.9 and 2.0% from spring and autumn stockings respectively, although netting exercises indicated that these survived longer in the lake than hatchery fish. Analysis of the methods of capture indicated that hatchery fish were more liable to be caught by bait fishing whereas fly fishing was the most successful for wild fish. Estimates were made of the relative cost effectiveness of the various types of fish in terms of returns to the angler.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1979.tb00254.x
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  • 5
    Digitale Medien
    Digitale Medien
    Mass marking of salmonids (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 8 (1977), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1977.tb00215.x
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  • 6
    Digitale Medien
    Digitale Medien
    Assessment of a semi-quantitative electric fishing sampling technique for juvenile Atlantic salmon, Salmo salar L., and trout, Salmo trutta L., in small streams (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 20 (1989), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A semi-quantitative technique of assessing trout, Salmo trutta L., and juvenile Atlantic salmon, Salmo salar L., stocks in small rivers is described and evaluated against a commonly used quantitative method. The results indicate that for 0+ and 〉0+ juvenile salmon and trout a log10 n+1 transformed linear regression accounted for between 68.6% and 90.2% of the total variance in the relationship between the semi-quantitative and the quantitative result. The use of a categorization system is recommended and the applicability of the technique to an extensive juvenile salmonid monitoring programme is described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1989.tb00375.x
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  • 7
    Digitale Medien
    Digitale Medien
    The Effects of a Land Drainage Scheme on the Salmonid Populations of the River Camowen, Co. Tyrone (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 14 (1983), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Annual electro fishing surveys were carried out over an 11-year period at five sites on an upland river, which was subject to dredging operations in connection with a land drainage scheme. Four of the sites were dredged 3 years after the start of the survey and one control site remained undredged throughout. The results indicated that dredging operations initially reduced Salmonid densities and that there was subsequently a progressive downstream recovery, with fry densities taking up to 6 years to improve at the most downstream site. Yearling and older fish recovered to pre-drainage scheme levels more rapidly than fry.Changes in population structure were also observed at three of the dredged sites. Two sites were considerably deepened and finally contained larger numbers of older fish than prior to the drainage scheme. The opposite effect was found to have taken place at a site, which became shallower as a result of drainage works, and contained larger numbers of fry at the end of the survey.Increased fish growth rates were also observed at all sites over the experimental period, and this may have been correlated with enrichment of the river system by leaching from increased fertilizer usage within the catchments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1983.tb00049.x
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  • 8
    Digitale Medien
    Digitale Medien
    Evaluation of Fluorescent Pigment Marking of Brown Trout (Salmo trutta L.) and Atlantic Salmon (Salmo salar L.) (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 13 (1982), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Fish 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1982.tb00036.x
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  • 9
    Digitale Medien
    Digitale Medien
    Comparative Survival from Salmon (Salmo salar L.) Stocking with Eyed and Green Ova in an Upland Stream (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 12 (1981), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The survival rates of salmon stocked as eyed ova and green eggs in an upland trout stream were compared by electrofishing a number of sites during their first summer and at the end of their first complete year. The results were compared with the survival rates in the naturally spawning trout population. It was found that the survival rates from eyed ova were considerably better than that from green eggs and the results were discussed in the context of environmental effects and territorial competition in emerging fry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1981.tb00008.x
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  • 10
    Digitale Medien
    Digitale Medien
    Fluorescent Pigment Marking of Cyprinids (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 15 (1984), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2109.1984.tb00410.x
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