Age structure and growth of peacock cichlids from rivers and reservoirs of Venezuela

Journal of Fish Biology - Tập 55 Số 2 - Trang 433-450 - 1999
David B. Jepsen1, Kirk O. Winemiller1, Donald C. Taphorn2, Douglas Rodríguez‐Olarte2
1Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843-2258 U.S.A.
2Universidad Experimental de Los Llanos Ezequiel Zamora, Guanare, Portuguesa, Venezuela 3310

Tóm tắt

Cichla temensis collected in Venezuela attained a mean standard length of 440 mm, and C. orinocensis and C. intermedia mean lengths of 309 and 321 mm, respectively. There was little evidence of size differences between sexes. Opaque zones on otoliths corresponded to the period of peak of reproductive activity and low fish body condition (K). When aggregated across sites, linear estimates for growth of fish >age I were 57·5, 27·6, and 19·6 mm year1 for C. temensis, C. orinocensis, and C. intermedia, respectively. Fish from the Cinaruco River appeared to spawn at age I, and prior to first maturation had grown 25, 21, and 23 mm month1, respectively, for C. temensis, C. orinocensis, and C. intermedia. There was little intersite variation in growth rates, and differences in sizes of conspecifics from different sizes were due to age differences. Cichla in captivity spawn several times per year. The present results indicate that the annual cycle or tropical wet/dry seasonality promotes reproductive seasonality in Cichla. The energetic cost of reproduction and brood defence probably constrains most individuals to one spawn per year. Conversely, populations living in relatively aseasonal reservoir environments may have several spawns per year, in which case growth zones on hard structures are difficult to interpret.

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Journal of Fish Biology

Tập 55 Số 2

433-450

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