Acute Toxicity of Tea Seed Cake on Climbing perch (Anabas testudineus (Bloch))

Abstract

Tea seed cake is common used in fish and shrimp farms in Thailand for controlling pond predators such as fish, shellfish or tadpole due to its applicable and affordable price. Climbing perch (Anabas testudineus (Bloch)) is one of several problems in aquaculture because it can lead to threatening diseases, the displacement of native species, causing changes to the water quality. Moreover they may effect as destroy or decrease of the productivity. So, acute toxicity of tea seed cake on climbing perch was studied. Statistic bioassay method (48-hr LC₅₀) was a technique to determine the median lethal concentration of the tea seed cake to kill climbing perch within 48 hours. The results showed that limitation of the 48-hr LC₅₀ concentration at 95% confidence of tea seed cake on climbing perch (size of approximately 5±2 cm) was 33 (31.16-36.10) ppm. The slope function was 1.361(0.88-2.11) ppm and safe concentration was 1.65 ppm. This result can be used to apply for controlling of fish predator as fish which have accessory respiratory organs for farming application.