Water temperature, body mass and fasting heat production of pacu (Piaractus mesopotamicus)

Author(s)

Aguilar, Fredy A. A. ; da Cruz, Thaline M. P. ; Mourao, Gerson B. ; Cyrino, Jose Eurico P.

• Document type: Journal article
• Source: Anais da Academia Brasileira de Ciências; v. 89, n. 2, p. 1305-1312, JUN 2017.
• Web of Science Citations: 2

Abstract

ABSTRACT Knowledge on fasting heat production (HEf) of fish is key to develop bioenergetics models thus improving feeding management of farmed species. The core of knowledge on HEf of farmed, neotropical fish is scarce. This study assessed the effect of body mass and water temperature on standard metabolism and fasting heat production of pacu, Piaractus mesopotamicus, an omnivore, Neotropical fresh water characin important for farming and fisheries industries all through South American continent. An automated, intermittent flow respirometry system was used to measure standard metabolic rate (SMR) of pacu (17 - 1,050 g) at five water temperatures: 19, 23, 26, 29 and 33 °C. Mass specific SMR increased with increasing water temperature but decreased as function of body mass. The allometric exponent for scaling HEf was 0.788, and lied in the range recorded for all studied warm-water fish. The recorded van't Hoff factor (Q10) for pacu (2.06) shows the species low response to temperature increases. The model HEf = 0.04643×W0.7882×T1.837 allows to predict HEf (kJ d-1) from body mass (W, kg) and water temperature (T, °C), and can be used in bioenergetical models for the species. (AU)

• FAPESP's process: 12/21937-8 - Mathematical modeling of energy and protein utilization efficiency of feeds and foods by pacu (Piaractus mesopotamicus Holmberg, 1887)
• Grantee: José Eurico Possebon Cyrino
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/15618-2 - Intestinal ephitelium and microbiota of juveniles pacu Piaractus mesopotamicus and dourado Salminus brasiliensis fed diet with vegetable protein sources
• Grantee: Thaline Maira Pachelli da Cruz
• Support Opportunities: Scholarships in Brazil - Doctorate