Abstract It is commonly assumed that beach seining (BS) is more sustainable than bottom trawling because it involves non-motorized operations and limited fishing power. However, no scientific evidence supports this assumption. To address this gap, we evaluated the impact of beach seining, taking a small-scale shrimp fishery in northeast Brazil. Data collected monthly from December 2016 to November 2017 and in literature, were assessed (BS 31,001 individuals, 119 species, 37 families, and 19 orders; BT 6,031 individuals, 58 species, 20 families, and 14 orders). Beach seining demonstrated a lower proportion of bycatch (BS 1:2.3; BT 1:3.2), higher total shrimp catch (BS 87.2 t; BT 65 t), and greater species diversity than bottom trawling catches (BS 119; BT 58). Other aspects were closer associated with bottom trawling, such as the composition of dominant families (Sciaenidae and Pristigasteridae), the proportion of rare species (BS 30%; BT 24%) juveniles (BS 11g; BT 13g), the risk of species extinction, and the composition of ecological guilds. Despite their social significance, both fishing gears showed similar ecological indicators and adverse effects. The findings establish that the ecological concerns related to the impact of bottom trawling are also applicable to beach seine. BS nonmotorized non motorized power However assumption gap smallscale small scale Brazil 201 literature 31001 31 001 31,00 individuals 11 3 1 orders 6031 6 031 6,03 5 2 orders. . orders) 12.3 123 2.3 1:2.3 13.2, 132 3.2 , 1:3.2) 872 87 87. t t, t) 58. 58) Sciaenidae Pristigasteridae, Pristigasteridae Pristigasteridae) 30% 30 24% 24 11g g 13g, 13g 13g) extinction guilds significance effects seine 3100 00 31,0 603 03 6,0 12 12. 23 2. 1:2. 13 13.2 32 3. 1:3.2 8 310 0 31, 60 6, 1:2 13. 1:3. 1: 1:3

O objetivo deste trabalho foi avaliar o uso de probióticos na produção de pós-larvas do camarão-rosa (Farfantepenaeus brasiliensis). Utilizou-se o delineamento experimental inteiramente casualizado, com dois tratamentos - uso de probióticos (Bacillus spp.) e controle com uso de antibiótico (eritromicina) - e quatro repetições. Pós-larvas no estágio PL1 foram estocadas em cada parcela experimental (3,0 L) e cultivadas até o estágio PL10. As variáveis de qualidade de água e o desenvolvimento de bactérias do gênero Vibrio, na água de cultivo, foram monitorados ao longo do experimento. Ao final do período experimental, as pós-larvas foram avaliadas qualitativamente e quanto à sobrevivência, ao peso e ao comprimento. Nas variáveis de qualidade de água, apenas o nitrito apresentou valor significativamente maior no tratamento com antibiótico. Para as variáveis peso e comprimento final, não houve diferenças significativas entre os tratamentos. Não foram observadas diferenças significativas entre os tratamentos quanto à qualidade das pós-larvas e à concentração de Vibrio spp. na água. A utilização de antibiótico pode ser substituída pelo emprego de probióticos durante a produção de pós-larvas de F. brasiliensis.

The objective of this work was to evaluate the use of probiotics in the production of postlarvae of pink shrimp (Farfantepenaeus brasiliensis). A completely randomized experimental design was used, with two treatments - use of probiotics (Bacillus spp.), and a control using antibiotic (erythromycin) -, and four replicates. Postlarvae in the PL1 stage were stocked in each experimental unit (3.0 L) and cultured until stage PL10. Water quality variables and the development of the bacteria of the genus Vibrio, in the culture water, were monitored throughout the experiment. At the end of the experimental period, postlarvae were evaluated qualitatively and for survival, weight, and length. Regarding water quality variables, only nitrite was significantly higher in the antibiotic treatment. For the variables weight and length, there were no significant differences between treatments. No significant differences between treatments were observed in postlarvae quality and in the concentration of Vibrio spp. in the water. The use of antibiotics may be replaced by probiotics during production of F. brasiliensis postlarvae.