Environmental, Biological, and Fishing Factors Influencing Fish Mortality and Development of the Cachirra event, Navío Quebrao Lagoon

Abstract

Objetive: The present study analyzes environmental, biological and fishing factors incidence in the formation and mortality of the Cachirra event. Methodology: We collected samples from fishing nets used by the fishermen of "arranchaderos" community located in Navio Quebrao Lagoon (NQL). IDEAM provided 2017 climatologic data. Physicochemical variables were measured with Spectroquant SQ 118 and other direct measurement electronic devices. SPSS statistical software version 24.0 was used to analyze data and their relationships. Results: 12 species intervene in the formation of the Cachirra event, predominantly the Mugilidae family. Salinity was the physicochemical variable that most affected the mortality of the species -October (6.0 PSU) and March (67.4 PSU)-. Conclusions: Fishes die according to their susceptibility to salinity changes, being the most susceptible species Cathrorops spixii and Eugerres plumieri, and the most resistant Elops saurus and Mugil liza. The species present in NQL have sizes well below commercial significance and different condition factor values and repletion index values before and after the Cachirra event.