Comparação de duas densidades de estocagem de tilápia do Nilo (Oreochromis niloticus) em sistema aquapônico com quatro variedades de alface

• Autor(a) principal: Alcântara, João Victor Oliveira
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/50091
• topic: Oreochromis niloticus; Lactuca sativa L.; Sistema aquapônico

The objective of this work was to compare two storage densities (1.5 kg m⁻³ and 3.0 kg m⁻³) of Nile tilapia (Oreochromis niloticus) associated with four lettuce varieties (Lactuca sativa L.) being they: Regina of Summer, Simpsom Black Seed, White Roman Paris and Crespa Palmas in aquaponic system in the Station of Aquaculture Prof. Dr. Raimundo Saraiva da Costa during the 45-day period, in which 3 replicates of the storage densities tested were evaluated and 30 seeds of each lettuce variety were placed per system. Treatment 1 (1.5 kg m⁻³) was initially populated totaling a biomass of 9.0 kg, while treatment 2 (3.0 kg m⁻³) had 18.2 kg. Daily pH, dissolved oxygen and temperature were measured, while other parameters such as alkalinity, ammonia and nitrite were evaluated on a weekly basis. The final weight of fish in treatment 1 averaged 309.089 ± 28.410 g fish⁻¹ and in treatment 2, 279.425 ± 11.831 g fish⁻¹. Lettuces did not obtain satisfactory commercial results except for the Simpsom Black Seed variety in treatment 1, which obtained the best growth values, with a mean productivity of 186.883 g m⁻², head diameter 26.150 ± 3.960 cm and leaf length 13.400 ± 1.200 cm. Among the parameters of water quality, the dissolved oxygen of the two treatments was adequate, but presenting a statistical difference (p≤0.05), as well as all other parameters. The evaluated zootechnical parameters practically did not differ statistically (p> 0.05) with the exception of the feed conversion factor and allometric condition factor.