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1.
Braz J Biol ; 66(2B): 651-9, 2006 May.
Article in English | MEDLINE | ID: mdl-16906297

ABSTRACT

In this paper, we counted the ascending curimbatás at the fish ladder at the Cachoeira de Emas from October, 1992 to September, 1993 in one whole day (24 h period) per month at different observation points in the dam for 5 min every hour. Most of the fish (80%) were counted not in the fish ladder itself, but in two adjacent spillways at its left, perhaps due to the comparatively increased flow as they are narrower than the ladder. The bulk of the migration occurred in September/October. We inspected the degree of injury of the fish in order to examine the hypothesis that larger fish are less injured, however no conclusion was reached. The degree of injury varied between different points and in different months of the year.


Subject(s)
Animal Migration/physiology , Fishes/physiology , Reproduction , Animals , Body Size , Brazil , Female , Fishes/anatomy & histology , Fishes/injuries , Male , Rivers , Seasons
2.
Braz. j. biol ; 66(2b): 651-659, May 2006. mapas, tab
Article in English | LILACS | ID: lil-433150

ABSTRACT

Neste artigo, contamos os curimbatás na escada de peixes da Cachoeira de Emas, de Outubro/92 a Setembro/93, num dia durante 24h por mês, em diferentes pontos de observação da barragem, durante 5 min a cada hora. A maioria dos peixes (80%) foi observada e contada não na escada de peixes, mas em dois vertedouros adjacentes à sua esquerda, talvez devido ao maior fluxo de água, pois são mais estreitos que a escada. O pico da migração ocorreu em Setembro/Outubro. Inspecionamos o grau de injúria dos peixes a fim de examinar a hipótese de que peixes maiores estariam menos feridos, porém não chegamos a uma conclusão clara. O grau de injúria variou entre diferentes pontos e entre diferentes meses do ano.


Subject(s)
Animals , Female , Male , Animal Migration/physiology , Fishes/physiology , Reproduction , Body Size , Brazil , Fishes/anatomy & histology , Fishes/injuries , Rivers , Seasons
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