Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Research to compare the growth rate between the Acara Geophagus brasiliensis and tilapia Oreochromis nioticus in conditions of intensive monoculture utilizing ration and live food.

Abstract

The state of Santa Catarina, because of its climate conditions and lack of alternative native species with commercial interest, does its pisciculture mainly of exotics species. It is one of the main localities for the culture of Tilapia Oreochromis niloticus, (Linnaeus, 1758) and also where it will find many regions with favorable conditions for its growth. To those conditions, we have to add an excellent acceptance of this species by the market of companies that process fish, and also by the consumer in general. Acara or Cara is the generic name assigned to various fishes of the family of Ciclideos, same family that the Tilapia belongs. The most common species of fresh water fish in Brazil is Geophagus brasiliensis (QUOY & GAIMARD, 1824), which can grow up to 25cm long and adapts very well to hot and cold regions. The objective of this research is to evaluate the reproductive potential, growth rate and adaptability of the Geophagus brasiliensis to offer the pisciculturist an alternative of native species of commercial cultivation. It was observed the capability of captive reproduction, capability of sexual reversion, survival skills of larvae and growth rate of Acara until the termination stage, when comparing the same parameter with the Tilapia. Another objective of this research was to evaluate the acceptability of the species zooplankton Daphnia magna as a form of food for the larvae of Acara and Tilapia, as well as analyze the capability of this species of mass culture in covered tanks of psiculture by a system of green house where the culture can be done all year around. The combination of these research will envisage optimizing the final fish production (survival and weight gain) utilizing a low cost methodology.