Lambari fish Deuterodon iguape as an alternative to live bait for estuarine recreational fishing

Abstract

Fishing tourism is growing steadily in Brazil. Artisanal fishers meeting the demand for recreational fishing are capturing live juvenile shrimp in the estuaries and selling them for live bait, preventing the recruitment of a larger contingent into the ocean. This study compares the efficiency of using lambari, Deuterodon iguape Eigenmann, as live bait with the shrimp, Penaeus schmitti Burkenroad, while fishing for common snook (Centropomus spp.), as well as to evaluate the swimming behaviour of D. iguape in different salinities. The results showed that there was no significant difference between the live baits used (P. schmitti vs D. iguape). The month, the period of the day and salinity presented differences. The size of the species did not depend on the type of bait used. There was no statistical difference in swimming behaviour, but there was a trend of increased speed and displacement in the group exposed to a salinity of 10 g/L. In conclusion, D. iguape appears as effective as P. schmitti and can be successfully used as live bait; and from an ecological point of view, it reduces the impact of fishing on juvenile shrimp.

Salinity effects in metabolic rate and behavior in lambari Astyanax bimaculatus

“…Salinity addition may influence body behavior, transport stress, fish metabolism, but there is not enough information aiming live baits (Plaut, 2000;Guo, Yan, Ma, Xiao & Zhang, 2013;Souza-Bastos, Bastos, Carneiro & Freire, 2016). Henriques et al (2018) claim some fishers already use lambari species in estuarine sport fishing, however, there are no studies detailing resistance to low salinity concentrations for these species yet.…”

“…Individuals were distributed in three different groups (n=10) exposed in salinities of 0 (control), 5 and 10 g L -1 in 20 L glass fish tanks. This experiment was conducted according to Henriques et al (2018). Fish movements were filmed frontally and laterally for 2 minutes at 2 and 45 minutes of exposition.…”

“…Castilho- Barros et al (2014b) reported an increase in the demand for white shrimp from sport fishers in regions with great tourist activity like the Brazilian Southeast shore. In many cases, fishers keep these organisms in adapted structures and transport them in inappropriate ways, which causes stress, leads to high mortality rates and, consequently, leads to loss of money and time for artisanal fishers (Henriques et al 2018).…”

ECONOMIC FEASIBILITY FOR THE PRODUCTION OF LIVE BAITS OF LAMBARI (<i>Deuterodon iguape</i>) IN RECIRCULATION SYSTEM

“…In sport fishing, not only artificial baits are used but also live baits (small shrimps and some other kind of organisms), ideal for bass fishing (Centropomus sp. ), the most wanted fish by recreational fishermen in the southeast region in Brazil and live pray predator species (Barrella et al, 2016;Henriques et al, 2018). Nautical tourism focused on sport fishing creates a vast live bait demand, with marinas serving as intermediates in this trade (Castilho-Barros et al, 2014a).…”

“…Finding an alternative species to white shrimp, such as some euryhaline fish, for estuarine areas use, is a desire from recreational fishermen, so they would not depend only on one single species with seasonal offer. Henriques et al (2018), thinking on this demand, compared the efficiency of using lambari, Deuterodon iguape Eigenmann 1907, as live bait with the shrimp, Penaeus schmitti Burkenroad, while fishing for common snook (Centropomus sp.). The results showed that there was no significant difference between the live baits used (P. schmitti vs D. iguape).…”