Gilson Luiz Volpato

• To feed or to take refuge? a chemically-mediated trade-off in a tropical characin fish., AR.BR

• Abstract

  This project sought to solve an important problem in fish farming: how to distribute the ration in the feeding of larvae adequately. Current methods are precarious, allowing for high mortality rates, high competition for food (which leads to large growth differentials in individual fish), low growth rates and ration waste. The proposal entailed the introduction of a device that would carr…

  Food dispenser for larvae and fish farming of pacu and matrinxã, AP.PITE

• Abstract

  The matrinxã (Brycon cephalus) is one of the main species used in national fish farming, but its breeding still poses two fundamental problems: induction of spawning and the high index of cannibalism in the first days after the hatching of the larvae. As in previous studies, we observed that environmental coloring affects the aggression and the growth of this species, the present project …

  Environmental coloring as a reproduction assistant and reducer of cannibalism in matrinxã, AP.PITE

• Abstract

  Preference tests have been used and proposed in the literature to identify comfort conditions for the animals. In such tests, items preferred by the animals are inferred from momentary choices. Moreover, such choice tests are usually investigated in group of animals, but less frequently at the individual level. However, we recently demonstrated (Maia, 2012) that choices are different from…

  Give the animals what they want: validation of a preference index by effort tests, BP.DR
• Difference between choice and preference in fish: an approach for welfare, BP.MS

• Abstract

  This project aims to evaluate the effect of diet composition based on animal choice for ingredients and nutrients on Nile tilapia (Oreochromis niloticus) juveniles performance (growth and food efficiency), contrasting with traditional diet. This assumes that feeding management based on fish choice provides better welfare conditions. Three studies will be carried out. In the first study ei…

  Welfare and performance in Nile Tilapia juveniles: role of spontaneous choice behavior, BP.PD

(Only some records are available in English at this moment)

• Abstract

  Preference tests have been used in the literature to identify conditions of welfare for the animals. However, generally, preferences have been inferred from momentary choices. We recently demonstrated (Maia, 2012) that momentary choices are different from preferences (preferences = choices that are consistent over time). In this context, the next step is whether preferred conditions cause…

  Importance of preference for environmental items for rainbow trout, Oncorhynchus mykiss, BE.EP.DR