Can the introduction of non-native fish induce variation in life-history traits of a native species in a neotropical lake?

• DOI: 10.1071/mf21138
• Publication Date: 2022-02-18T00:05:26Z
• Authors: Thaís Paula de Ar...; Ludmila Silva Bri...; Bárbara Martins D...; Sérvio Pontes Rib...; Hélio Batista dos...; Ralph Gruppi Thomé
• Keywords: Gonadosomatic Index

Top predator fish, such as peacock bass (Cichla kelberi) and red-bellied piranha (Pygocentrus nattereri), were introduced in the lacustrine system of Rio Doce basin these introductions are associated with loss aquatic biodiversity. The present work aims to investigate life-history traits a native species, thraira (Hoplias malabaricus), context pressures caused by introduction top fishes. Two lakes selected conservation unit River State Park (PERD), namely, Lake Carioca, where P. nattereri C. kelberi introduced, Gambazinho, H. malabaricus occurs absence fish. In total, 146 specimens caught, including 95 Gambazinho 51 Carioca. Significant differences found length–weight relationship (LWR) diet, reproductive period, vitellogenic follicle size, gonadosomatic index (GSI). lake thrairas showed allometric growth, less diversified longer duration high GSI values compared control lake. results indicated that can be influenced environmental modification non-native piranha.