USING STOCK ASSESSMENT TO INVESTIGATE THE SUSTAINABLE FISHERIES OF THE YELLOW MANDI <i>Pimelodus maculatus</i> IN THE UPPER URUGUAY RIVER, SOUTHERN BRAZIL

Authors

  • Gianfrancisco Schork Universidade Federal do Sul da Bahia
  • Samara Hermes-Silva Universidade Federal de Santa Catarina (UFSC), Laboratório de Biologia e Cultivo de Peixes de Agua Doce (LAPAD).
  • Renata Maria Guereschi Universidade Federal de Santa Catarina (UFSC), Laboratório de Biologia e Cultivo de Peixes de Agua Doce (LAPAD).
  • Evoy Zaniboni-Filho Universidade Federal de Santa Catarina (UFSC), Laboratório de Biologia e Cultivo de Peixes de Agua Doce (LAPAD).
  • Alex Pires de Oliveira NUÑER Universidade Federal de Santa Catarina - UFSC

DOI:

https://doi.org/10.20950/1678-2305.2020.46.1.535

Keywords:

Growth, Mortality, Fish stock, Uruguay River

Abstract

The yellow mandi Pimelodus maculatus is a medium-sized species with a wide geographical distribution. The species is very common in the Neotropical region, representing an important share of fishing activity in several Brazilian reservoirs. Therefore, the objective of this study was to evaluate the current situation of the yellow mandi fish stock in the Itá reservoir, located in the Upper Uruguay River. Data collected from January 2004 to December 2016 were used to estimate growth, mortality, and fish recruitment rates. In addition, a stock assessment was performed, and the results were used to verify the status of the fishery. The mean of the population parameters were: total length (L) = 55.65 cm; length at which 50% of fish are vulnerable to capture (Lc) = 23.08 cm, growth rate (k) = 0.260 year-1, growth performance index (í­Ëœ) = 3.047, natural mortality rate (M) = 0.537, fishing mortality rate (F) = 0.413, total mortality rate (Z) = 0.95, exploitation rate (E) = 0.434, maximum age (Tmax) = 6.68 years. The growth curve obtained via ELEFAN I revealed that fishing operates on eight of the eleven cohorts of the population. Yellow mandi stock assessment did not show signs of fish overexploitation or any risk of depletion.

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2020-05-12

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