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Journal of Fisheries and Aquatic Science
  Year: 2011 | Volume: 6 | Issue: 6 | Page No.: 624-632
DOI: 10.3923/jfas.2011.624.632
 
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Hydroacoustic Study of Spatial and Temporal Distribution of Poblana alchichica (de Buen, 1945) in Lake Alchichica, Mexico
E. Arce, J. Alcocer, X. Chiappa-Carrara and L. Zambrano

Abstract:
The present study analyses the distribution and abundance of Poblana alchichica, an atherinidae fish endemic to Lake Alchichica. Fish were sampled using hydroacoustic surveys, carrying out equidistant transect performed on a perpendicular grid that covered the entire surface of the lake on a seasonal basis to take into account the four hydrodynamic stages of Lake Alchichica. Results indicate that vertical distribution of fish varies in time and is limited by the availability of dissolved oxygen in deeper layers. Prey distribution and the zone in which reproduction occurs (i.e., the littoral) limit the horizontal distribution of the fish. Abundance of P. alchichica varied from 12,510 fish in early stratification up to 29,200 fish in the well-established stratification. Spatially, the average abundance in the littoral zone was 13,973±2,040 fish while in the pelagic zone abundance reached 7,088±1.395 fish. Density of P. alchichica fluctuated from 0.000015 individuals per m3 in the pelagic zone during the early stratification to 0.019 individuals per m3 in the littoral zone during the well-established stratification. Mean density estimates was 0.009±0.002 individuals per m3. Hydroacoustic technique allowed understanding effectively fish density and distribution. These values are lower than those found in comparable environments and highlight the importance of the littoral zone and consequently the water level reduction, for the conservation of the species in the ecosystem.
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How to cite this article:

E. Arce, J. Alcocer, X. Chiappa-Carrara and L. Zambrano, 2011. Hydroacoustic Study of Spatial and Temporal Distribution of Poblana alchichica (de Buen, 1945) in Lake Alchichica, Mexico. Journal of Fisheries and Aquatic Science, 6: 624-632.

DOI: 10.3923/jfas.2011.624.632

URL: https://scialert.net/abstract/?doi=jfas.2011.624.632

 
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