Banca de QUALIFICAÇÃO: ELAINE OLIVEIRA PONTES

PRODUCTION OF TAMBAQUI (Colossomum macropomum) IN BIOFLOCS SYSTEMS WITH AQUAPONICS

sustainable aquaculture, aquaponics, bioflocs, native species, integrated production.

Aquaculture systems that allow greater productivity and that meet sustainable production principles are increasingly necessary for the development of modern aquaculture. Biofloc technology meets these requirements, as it presents strategies that make it possible to increase production with minimal environmental impact. Just like the biofloc system, the aquaponics system also has a series of characteristics that make it more sustainable compared to traditional production systems. However, it is necessary to evaluate the native fish species that are important to the Amazon region in these production systems. Therefore, the objective of this work will be to evaluate the use of tambaqui (Colossoma macropomum) and lettuce (Lactuca saliva) in aquaponics and flocoponics systems (aquaponics + bioflocs). The study will be conducted at the Multiple Laboratory for the Production of Aquatic Organisms /UFOPA, over a period of 75 days. The experiment will be conducted in a completely randomized design, with three production systems (aquaponics, coupled flocoponics and uncoupled flocoponics), with four replications each. Lettuce of the smooth variety will be used, with three production cycles and only one production cycle for fish (rearing). The aquaponics treatment will consist of a 500 L tank, sedimentator, biological filter and 100 L container with submersible pump coupled to an NFT (Nutriente Film Technique) hydroponic bench. The coupled flocoponics treatment will consist of a fish tank, sedimentator (container where the solids were retained and returned to the biofloc tank every one hour) and a container with a submerged pump coupled to the NFT-type hydroponic bench. In uncoupled flocoponics, the water will recirculate between the containers and NFT twice a day for two hours and return to the animals' tank. The rest of the time, the recirculation of nutritional water from the container with the submersible pump to the hydroponic bench will be restricted. The following will be evaluated in the study: water quality parameters (temperature, pH, dissolved oxygen, electrical conductivity, total ammonia, nitrite, nitrate, orthophosphate, alkalinity, settleable solids, total suspended solids and turbidity); fish performance variables (weight gain, daily weight gain, growth rate, survival, final biomass, productivity, apparent feed conversion); hematological and biochemical parameters of tambaquis; phytotechnical performance of lettuces (total wet weight of leaves and roots, total dry weight of leaves and roots, wet weight of leaves, dry weight of leaves, number of leaves, plant growth rate, productivity) and the economic viability of production systems.