Abstract
The sources of variations in the weight-length relationship parameters, and in the Fulton's, allometric, and relative condition factors (K) of the characiform fish Triportheus guentheri were investigated. The use of these indices as indicators of condition were also discussed. The 2899 females and 2491 males were captured with gill nets from January 1986 to March 1988 in Três Marias Reservoir (18° 15′ and 45° 15′ W), Brazil. Weight-length relationship parameters varied monthly in both sexes mainly due to the skewness of the relative frequency of the number of fish per body length. This suggests that a selective sample and/or the population length structure may strongly influence the estimate of those parameters. The K showed high correlations (r ≥ 0.99) among themselves. Their variations were ascribed to carcass weight in both sexes when analyzed by month, or to the ovary weights when analyzed by female gonad development intervals. The monthly weight-length relationship parameters of T. guentheri presented low or null correlation with K, except for the female's coefficient of regression. Problems using these parameters as indicators of condition suggested that they are not good indices to express condition. Some restrictions regarding the use of K are discussed.
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Bagenal, T.B. & F.W. Tesch. 1978. Age and growth. pp. 101–136. In: T. Bagenal (ed.) Methods for Assessment of Fish Production in Fresh Waters, 3rd edition, Blackwell Scientific Publications, Oxford.
Barbieri, G. & J.R. Verani. 1987. O fator de condição como indicador do período de desova em Hypostomus aff. plecostomus (Linnaeus, 1758) (Osteichthyes, Loricariidae), na represa do Monjolinho (São Carlos, SP) (The condition factor as an indicator of the spawning in Hypostomus aff. plecostomus (Linnaeus, 1758), at Monjolinho Reservoir (São Carlos — SP) (Osteichthyes, Loricariidae)). Ciência e Cultura 39: 655–658.
Bolger, T. & P.L. Connolly. 1989. The selection of suitable indices for the measurement and analysis of fish condition. J. Fish Biol. 34: 171–182.
Braga, F.M.S. 1986. Estudo entre factor de condição e relação peso/comprimento para alguns peixes marinhos (Study between condition factor and length/weight relation for some marine fishes). Revista Brasileira de Biologia 46: 339–346.
Cone, R.S. 1989. The need to reconsider the use of condition indices in fishery science. Trans. Amer. Fish. Soc. 118: 510–514.
Esteves, F.A., J.C. Amorim, E.L. Cardoso & F.A.R. Barbosa. 1985. Caracterização limnológica preliminar da represa de Três Marias (MG) com base em alguns parâmetros ambientais básicos (Preliminary limnological characterization of Três Marias Reservoir (MG) based on some basic environmental parameters). Ciência e Cultura 37: 608–617.
Frost, W.E. & C. Kipling. 1967. A study of reproduction, early life, length-weight relationship and growth of pike, Esox lucius L., in Windermere. J. Anim. Ecol. 36: 651–693.
Jobling, M. 1993. Bioenergetics: feed intake and energy partitioning. pp. 1–44. In: J.C. Rankin & F.B. Jensen (ed.) Fish Ecophysiology, Chapman & Hall, London.
Godinho, A.L. 1994. Biologia reprodutiva da piaba-facão Triportheus guentheri (Characiformes, Characidae) e o manejo hidrológico da represa de Três Marias (Reproductive biology of Triportheus guentheri (Characiformes, Characidae) and the hydrological management of Três Marias Reservoir, Brazil). Revista Brasileira de Biologia 54: 515–524.
Le Cren, E.D. 1951. The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). J. Anim. Ecol. 20: 201–219.
Maceina, M.J. & B.R. Murphy. 1988. Variation in the weight-to-length relationship among Florida and northern largemouth bass and their intraspecific F1 hybrid. Trans. Amer. Fish. Soc. 117: 232–237.
Murphy, B.R., M.L. Brown & T.A. Springer. 1990. Evaluation of the relative weight (Wr) index, with new applications to walleye. North Amer. J. Fish Manage. 10: 85–97.
Ney, J.J. 1993. Practical use of biological statistics. pp. 137–158. In: C.C. Kohler & W.A. Hubert (ed.) Inland Fisheries Management in North America, American Fisheries Society, Bethesda.
Ricker, W.E. 1973. Linear regressions in fishery research. J. Fish. Res. Board Can. 30: 409–434.
Ricker, W.E. 1975. Computation and interpretation of biological statistics of fish populations. Bull. Fish. Res. Board Can. 191: 1–382.
Rossi-Wongtschowski, C.L.B. 1977. Estudo das variações da relação peso total/comprimento total em função do ciclo reprodutivo e comportamento, de Sardinella brasiliensis (Steindachner, 1879) da costa do Brasil entre 23° S e 28° S (Variation of the length/weight relationship as a function of the reproductive cycle and behaviour of Sardinella brasiliensis (Steindachner, 1879) in the Brazilian coast between 23° S and 28° S). Boletim do Instituto Oceanográfico 26: 131–180.
Santos, E.P. 1978. Dinâmica de populações aplicada a pesca e piscicultura (Populations dynamic applied to fisheries and fishculture). Hucitec-Edusp, São Paulo. 129 pp.
Snedecor, G.W. & W.G. Cochran. 1989. Statistical methods, 8th edition. Iowa State University Press, Ames. 503 pp.
Sokal, R.R. & F.J. Rohlf. 1995. Biometry, 3th edition. Freeman, New York. 887 pp.
Weisberg, S. 1985. Applied linear regression, 2nd edition. John Wiley & Sons, New York. 324 pp.
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Godinho, A.L. Weight-length relationship and condition of the characiform Triportheus guentheri. Environmental Biology of Fishes 50, 319–330 (1997). https://doi.org/10.1023/A:1007316028288
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DOI: https://doi.org/10.1023/A:1007316028288