Do cage fish farms interfere with the food aspects of the wild species Metynnis lippincottianus (Characiformes, Serrasalmidae)?

Author(s)

Ramos, Julia Kaori Kuriyama ; do Bonfim, Vinicius Cesar ; Kliemann, Bruna Caroline Kotz ; Garves, Jose Daniel Soler ; Delariva, Rosilene Luciana ; Ramos, Igor Paiva

• Document type: Journal article
• Source: BOLETIM DO INSTITUTO DE PESCA; v. 48, p. 9-pg., 2022-01-01.

Abstract

We evaluated the differences in the diet and trophic guild of Metynnis lippincottianus under the in-fluence of cage fish farms in the Neotropical reservoir. We collected samples from two areas (cage farm and control) in March and June 2019. Stomach contents were examined, and food items were identified and quantified using the volumetric method. Differences in diet composition were evaluated using PERMANOVA and SIMPER analyses, while trophic niche breadth was determined using PERMDISP. The trophic guild for each area was also determined. Significant differences in diet between cage farm and control areas were observed, due to consumption of pelleted feed, mi-crocrustaceans, Egeria sp., and filamentous algae. In both sampling areas, M. lippincottianus was classified as algivorous. Despite the pelleted feed consumption in the cage farm area, no differen-ces were observed in trophic niche breadth and the trophic guild. In addition, algae and macro-phytes still accounted for the majority of this species' diet in both areas, indicating partitioning of resources. This resource partitioning may favor coexistence, but it is worth mentioning that pelleted feed consumption still indicates the influence of cage fish farms on the diet of wild fish. (AU)

• FAPESP's process: 18/01117-2 - Trophic ecology and physiological biomarkers of two species of fish belonging to different trophic guilds (omnivorous and carnivorous) associated to cage fish farms
• Grantee: Bruna Caroline Kotz Kliemann
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 20/10507-9 - Do cage fish farms interfere with the trophic ecology of Metynnis lippincottianus (Characiformes, Serrasalmidae) ?
• Grantee: Julia Kaori Kuriyama Ramos
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 18/26348-7 - Trophic ecology and isotopic, histophysiological biomarkers of two species of fish belonging to different trophic guilds associated to cage fish farms
• Grantee: Igor Paiva Ramos
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants