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GROWTH, MORTALITY AND PRODUCTION OF BROWN AND RAINBOW TROUT IN NEW MEXICO STREAMS
S. Leiner
Sažetak
Thirty-two representative trout sites in 15 high elevation New Mexico streams (1,661 - 2560 m above sea level) were sampled in 1988 and 1989. Fish was captured by consecutive removal via electrofishing in net-blocked segments from 65 to 160 m long. Maximum estimated trout length (Lm.ax) was related inversely to yield (r2 = 0.351; p = 0.055). Instantaneous rate of mortality was also marginally related to yield (r2 = 0.294). The production index ranged from 1,38 to 32.02 g/m2/year. Variation in production was highly correlated to trout biomass (r2 = 0.910). Trout growth and production were best defined by the relationships where: cover, stream width, water temperature, yield by anglers, LMAX, and nitrate-nitrogen concentration were included.
Ključne riječi
Salmo trutta m. Fario; Oncorhynchus mykiss; streams; growth; production; mortality; New Mexico; management
Hrčak ID:
47312
URI
Datum izdavanja:
30.6.1995.
Posjeta: 1.111 *