Cannibalism of matrinxã, Brycon cephalus, larvae after immersion of eggs to different triiodothyronine (T3) concentration
Keywords:
larviculture, Brycon cephalus, thyroid hormones, attacksAbstract
The present work evaluated larvae cannibalism of matrinxã, Brycon cephalus, originated from eggs exposed to triiodothyronine in the period of 36 to 72 hours after hatching. The observed parameters were: weight and length of larvae, stomach content, presence of cannibalism and types of attack. The study was carried out at Centro de Pesquisa e Gestão de Recursos Pesqueiros Continentais (CEPTA/IBAMA), Pirassununga - SP, in November 2004. Three females were hormonally induced to spawn and pooled oocytes were fertilized and separated into four batches that constituted the treatments: L1 (control - water); L2 (0.01 ppm T3); L3 (0.05 ppm T3) and L4 (0.1 ppm T3). Eggs were exposed during 15 minutes to water or to solutions containing the different concentrations of T3. Eggs were distributed in 12 conic incubators (60 L), with three replicates per treatment. There were stocked 500 mL of eggs per incubator and hatched larvae were counted. Samples of 30 larvae per treatment were collected during occurrence of cannibalism (36, 48, 60 and 72 hours after hatching). Predator larvae (with rests of larvae in the stomach) were 50% of the total number of larvae and they presented weight 50% higher compared to that of no predator larvae (without rests of larvae in the stomach) and were 9% higher regarding length. Coefficient of variation of weight and length did not differ among treatments, showing similarity in relation to the size. The stomach content revealed that cannibalism occurred in around 50-60% of larvae, regardless the exposure to the triiodothyronine, and that attacks were characterized as head-tail and tail-head confrontations.
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