Abstract
Scales from 427 Barbus barbus plebejus and 406 Leuciscus cephalus cabeda from the middle River Po were examined. The last annulus was formed between April and May 1977, except the 0–1 age-group of L.c. cabeda which developed its first year-ring between March and April 1977. The survival (S) and annual mortality (A) rates were equivalent in both fish populations; the same was true of both sexes of Leuciscus, but S in Barbus males was lower than in females. The sex ratio showed a preponderance of females in both species.
Growth rate from June to September 1976 was higher than in the rest of the year. Annual growth in Barbus females was higher than in males, whereas both sexes in Leuciscus showed equivalent growth rates; growth rate was higher in Barbus than in Leuciscus. The P/B ratio of both species was higher in the young age-groups.
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Bagenal, T. B. & Tesch, F. W., 1978. Age and Growth. In: T. Bagenal (ed.), Methods for Assessment of Fish Production in Fresh Waters. Blackwell Sci. Publ., Oxford, pp. 101–136.
Bell, G., Hanford, P. & Dietz, C., 1977. Dynamics of an exploited population of Lake Whitefish (Coregonus clupeaformis). J. Fish. Res. Bd Can. 34: 942–953.
Bertalanffy, L. von, 1938. A quantitative theory of organic growth (Inquiries on growth laws — II). Hum. Biol. 10: 180–213.
Bertonati, M. & Ioannilli, E., 1981. Considerazioni sulle caratteristiche dell'acqua e dei sediments del medio Po nel triennio 1974–1977. Riv. Idrobiol. 20: 123–135.
Brown, E. H. Jr., 1970. Extreme female predominance in the bloater (Coregonus hoyi) of Lake Michigan in the 1960s. In: C. C. Lindsey & C. S. Wood (eds.), Biology of Coregonus Fishes. Manitoba Press, Winnipeg, pp. 501–514.
Chapman, D. W., 1978. Production. In: T. Bagenal (ed.), Methods for Assessment of Fish Production in Fresh Waters. Blackwell Sci. Publ., Oxford, pp. 202–218.
Christie, W. J., 1968. Possible influences of fishing in the decline of Great Lakes fish stock. Proc. Conf. Great Lakes Res. Int. Assoc. 11: 31–38.
Cragg-Hine, D. & Jones, J. W., 1969. The growth of Dace Leuciscus leuciscus (L.), Roach Rutilus rutilus (L.) and Chub Squalius cephalus (L.) in Willow Brook, Northamptonshire. J. Fish. Biol. 1: 59–82.
Gulland, J. A., 1969. Manual of methods for fish stock assessment — Part I. Fish population analysis. FAO Man. Fish. Sci. 4: 1–154.
Healy, M. C., 1980. Growth and recruitment in experimentally exploited lake whitefish (Coregonus clupeaformis) populations. Can. J. Fish. Aquat. Sci. 37: 255–267.
Hellawell, J. M., 1971. The autoecology of the chub, Squalius cephalus (L.), of the River Lugg and the Afon Llynfi. Freshwater Biology 1: 29–60.
Hickley, P. & Bailey, R. G., 1982. Observations on the growth and production of chub Leuciscus cephalus and dace Leuciscus leuciscus in a small lowland river in southeast England. Freshwater Biology 12: 167–178.
Hunt, P. C. & Jones, J. W., 1975. A population study of Barbus barbus L. in the River Severn, England — III Growth. J. Fish Biol. 7: 361–376.
Kirka, A., 1965. Age and growth of the chub, Leuciscus cephalus (L.), from the Orava Reservoir and its drainage area. Zool. Listy 14: 235–250.
Mann, R. H. K., 1973.. Observations on the age, growth, reproduction and food of the Roach Rutilus rutilus (L.) in two rivers in Southern England. J. Fish. Biol. 5: 707–736.
Mann, R. H. K., 1976. Observations on the age, growth, reproduction and food of the chub Squalius cephalus (L.) in the River Stour, Dorset. J. Fish. Biol. 8: 265–288.
Micha, J. C., 1971. Densité de population, age et croissance du barbeau Barbus barbus (L.) et de l'ombre Thymallus thymallus (L.) dans l'Ourthe. Ann. Hydrobiol. 2: 47–68.
Nikolskii, G. V., 1969. Theory of fish population dynamics as the biological background for rational exploitation and management of fishery resources. Oliver & Boyd, Edinburgh, 323 pp.
Reichenbach-Klinke, H. H., 1962. Wachstumuntersuchungen au Donaufischen. Arch. Hydrobiol. 27: 57–71.
Ricker, W. E., 1958. Handbook of computation for biological statistics of fish population. Bull. Fish. Res. Bd Can. 119: 1–300.
Taylor, C. C., 1958. A note on Lee's phenomenon in George Bank haddock. International Commission for North-West Atlantic Fisheries Spec. Publ. 1: 243–251.
Turner, J. L., 1977. Changes in the size structure of Cichlid populations in Lake Malawi resulting from bottom trawling. J. Fish. Res. Board Can. 34: 232–238.
Vitali, R. & Braghieri, L., 1981. Caratteristiche strutturali e dinamiche del popolamento ittico del medio Po nella zona di Caorso. Riv. Idrobiol. 20: 269–304.
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Vitali, R., Braghieri, L. Population dynamics of Barbus barbus plebejus (Valenciennes) and Leuciscus cephalus cabeda (Risso) in the middle River Po (Italy). Hydrobiologia 109, 105–124 (1984). https://doi.org/10.1007/BF00011570
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DOI: https://doi.org/10.1007/BF00011570