Density and Organic Matter Influence on Egg‐laying and Hatching of Branchiura sowerbyi (Oligochaeta) |
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| Authors: | Karine Cristiane Rech Renata Maria Guereschi Alex Pires de Oliveira Nuñer Sarah Carvalho Sticca |
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| Institution: | 1. Aquaculture Graduate Program, Laboratory of Freshwater Fish Biology and Cultivation, Federal University of Santa Catarina, Rodovia SC 406 no 3532, Florianópolis, Santa Catarina, Brazil;2. Ecology Graduate Program, Laboratory of Freshwater Fish Biology and Cultivation, Federal University of Santa Catarina, Rodovia SC 406 no 3532, Florianópolis, Santa Catarina, Brazil |
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| Abstract: | This study aimed to assess the combined effects of density of adults of Branchiura sowerbyi and the source of organic matter on the production of eggs and young species. The experimental units used were 250‐mL beakers with 100 mL of fine sand (0.074–0.210 mm) and 150 mL of chlorine‐free water with constant aeration at the temperature 25 C. The experiment was conducted based on a two‐factor model with six treatments and three repetitions, applied in a completely random design. The densities 5 individuals/38.5cm2 (D5; 1298/m2) and 8 individuals/38.5cm2 (D8; 2078/m2) were assessed with commercial fish feed (FF), commercial poultry feed (PF), and turkey manure (TM) as sources of organic matter. A total of 1223 cocoons and 2138 eggs were produced, with average hatching of 40.0 ± 15.1%. The highest number of cocoons and eggs was found with the use of PF, D8 having produced the highest number of cocoons and eggs. The hatching rate was not influenced by the source of organic matter or density and no influence was registered from the density of adults on the survival. The PF provided the highest growth of adults, and generally the use of TM provided the worst performance. |
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