Relationship between largemouth bass recruitment and water level dynamics in a Puerto Rico reservoir

Ozen O. , NOBLE R.

LAKE AND RESERVOIR MANAGEMENT, cilt.21, ss.89-95, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 21 Konu: 1
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1080/07438140509354416
  • Sayfa Sayıları: ss.89-95


Recruitment of largemouth bass at age-1 in a Puerto Rico reservoir can be predicted from water level variables of the previous year. Age-1 largemouth bass electrofishing catch-per-unit-effort (CPUE) as an index of year-class strength varied five fold between 1994 and 2001 in Lucchetti Reservoir, Puerto Rico. The CPUE of age-1 largemouth bass was higher in years when the water level of the previous years (1993-2000) remained high during the spawning period (January-June). The greatest water level drop (11.2 m) during the spawning period was observed in 1999, resulting in a water volume decrease of 66.5%, which corresponded to the lowest recruitment (CPUE 24.2 fish-h(-1)). With only 2.6 m of water level drop and 18.3 % water volume decrease during the spawning period, the 1995 largemouth bass cohort was the strongest (CPUE 128.3 fish-h(-1)). The effect of these hydrological variables on largemouth bass recruitment appeared to be exponential rather than linear. Age-l largemouth bass comprise the majority of the fishable stock in Lucchetti Reservoir, and the stock is typically below carrying capacity. Thus, the potential exists to adopt a water level management plan during the spawning period of largemouth bass to ensure successful largemouth bass recruitment into the next year's fishable stock.