The effect of subjective fish scale ageing on growth and recruitment analyses: a case study from the UK

• Autorzy: Musk R.S. , Britton J.R. , Axford S.N.
• Języki publikacji: EN

Abstrakty

EN

Re-ageing of scales sampled in 1985 from the population of roach, Rutilus rutilus (L.), of the River Stour, England, revealed a high degree of subjectivity in their ageing, resulting from contrasting interpretations of similar scale features between practitioners. Compared with ages attained in 1985, re-ageing of the scales in 2004 only found agreement >80% at ages 1, 2, and 4 years. By age 9, agreement had dropped to 6%. The re-ageing revealed the presence of year classes that had previously been thought to have already died out and suggested their recruitment strength was associated with water temperatures in the first year of life of cohorts.

Słowa kluczowe

EN

Rutilus rutilus; aging; animal population; fish; roach; temperate water; year class strength; animal age; animal growth; determination; fishery science; fishery management

• Wydawca: -
• Czasopismo: Acta Ichthyologica et Piscatoria
• Rocznik: 2006
• Tom: 36
• Numer: 1
• Opis fizyczny: p.81-84,fig.,ref.

Twórcy

autor

Musk R.S.

• National Fisheries Technical Team, Environment Agency, Bristol, U.K.

autor

Britton J.R.

autor

Axford S.N.

Bibliografia

• Anonymous 2000. Directive 2000/60/EC of the European Parliament and of the council of 23 October 2000 establishing a framework for community action in the field of water policy. Official Journal of the European Communities L 327: 1-72.
• Bagenal T.B., Tesch F.W. 1978. Age and growth. Pp. 101-136. In: Bagenal T.B. (ed.) Methods for the assessment of fish production in fresh waters. Blackwell Scientific Publications, Oxford.
• Beamish R.J. 1979. New information on the longevity of Pacific ocean perch (Sebastes alutus). Journal of the Fisheries Research Board of Canada 36: 1395-1400.
• Bertalanffy L. von 1960. Principles and theory of growth. Pp. 137-259. In: Nowinski W.W. (ed.) Fundamental aspects of normal and malignant growth. Elsevier, Amsterdam.
• Britton J.R., Axford S.N., Cowx I.G., Frear P.A. 2004. An overview of recruitment patterns of roach Rutilus rutilus (L.) between 1969 and 2001 in the rivers of England and their influence on population abundance. Ecohydrology and Hydrobiology 4: 91-102.
• Campana S.E. 2001. Accuracy, precision and quality control in age determination, including review of the use and abuse of age validation methods. Journal of Fish Biology 59: 197-242.
• Cowx I.G., Frear P.A. 2004. Assessment of year class strength in freshwater recreational fish populations. Fisheries Management and Ecology 11: 117-123.
• Frear P.A., Cowx I.G. 2003. Factors affecting coarse fish recruitment: Phase II: Examination and analysis of existing Environment Agency data. Environment Agency R&D Publication W2 048. The Stationery Office, London.
• Mann R.H.K., Steinmetz B. 1985. On the accuracy of age determination using scales from rudd, Scardinius erythrophthalmus (L.), of known age. Journal of Fish Biology 26: 621-628.
• Mills C.A., Mann R.H.K. 1985. Environmentally induced fluctuations in year class strength and their implications for management. Journal of Fish Biology 27 (Suppl. A): 209-226.
• Ricker W.E. 1975. Computation and interpretation of biological statistics of fish populations. Bulletin of the Fisheries Research Board of Canada 191: 1-382.