Intensification of the Giant river prawnMacrobrachium rosenbergiihatchery production

Abstract

We evaluated the effect of intensification on Macrobrachium rosenbergii hatchery in clear water recirculating system. Larvae were raised in 120-L cylindrical tanks coupled with 30-L biofilters. We performed two experiments in randomized blocks.In the first, we tested the stocking densities of 50, 70 and 90 newly hatched larvae L À1 . Survival did not differ by ANOVA (P = 0.343), but productivity increased with the intensification (P = 0.038). In the second experiment, we tested the stocking densities of 80, 100, 120 and 140 newly hatched larvae L À1 . Survival decreased (P = 0.039) as density increased, but productivity did not differ (P = 0.317). The period of culture ranged from 22 to 23 days. The intensification did not influence water quality parameters or larval development. Survival decreased with the intensification and the space showed to be a limiting factor on tanks stocked with 90 larvae L À1 or more. Productivity curve shows an increase from 50 to 100 larvae L À1 and tended to reach plateau on stocking densities higher than 100 larvae L À1 . In addition, the intensification improved the use of Artemia cysts by decreasing the superfluous feeding. Thus, we recommend stocking of 80 to 100 newly hatched larvae L À1 as the best option for M. rosenbergii hatchery in clear water recirculating system.

Stocking density for freshwater prawn Macrobrachium rosenbergii (Decapoda, Palaemonidae) in biofloc system

“…The increase in stocking density interferes with hierarchical competition and disputes for space and food, resulting in higher cannibalism (Sampaio & Valenti, 1996;Arnold et al, 2006;Moraes-Valenti et al, 2010). According to David et al (2015), M. rosenbergii shows higher performance at lower stocking densities. El-Sherif & Mervat (2009) ) in experimental tanks with clear water, observing higher survival rate (72.2%) using the density of 50 ind m -2 at the end of 90 days of rearing, corroborating the results observed in the present study.…”

Length/weight relationship and condition factor of Macrobrachium jelskii (Miers, 1877) and M. brasiliense (Heller, 1862) (Decapoda, Palaemonidae) in two locations in the state of São Paulo

“…In Brazil, this genus includes 19 species (Mantelatto et al, 2016), besides some introduced species, such as Macrobrachium rosenbergii (de Man, 1979) (New and Valenti, 2000;Melo, 2003). Some of the main species are used in shrimp farming, such as M. rosenbergii and Macrobrachium amazonicum (Heller, 1862), which are extensively studied for cultivation projects (Freire et al, 2012;David et al, 2016). Due to phenotypic plasticity, species of this genus occur in different types of environments, from estuarine to lotic and semi-lotic freshwater ecosystems (Pantaleão et al, 2012;Nobrega et al, 2014).…”

Economic feasibility of intensification of Macrobrachium rosenbergii hatchery

“…A balance between the higher economic benefit and the risk of system's breakdown through auto pollution and animal mortality has to be managed. Both hatcheries of high stocking density (100 and 140 larvae per L) showed attractive economic results and are technically feasible (David et al, ). The break‐even point of 100 and 140 larvae per L were 20.9% and 20.5%, respectively, which is strategic for dealing with unexpected mortalities caused by diseases (Arcier et al, ; Murwantoko, Bimantara, Roosmanto, & Kawaichi, ; Sahul Hameed, Yoganandhan, Sri Widada, & Bonami, ; Vijayan, Raj, Alavandi, Sekhar, & Santiago, ) and demonstrates the robustness of both systems if productivity drops.…”

“…All hatcheries were designed to operate in Southern Brazil, at a distance of ~500 km from the São Paulo State coastal area. Production data were extrapolated from a pilot‐scale experiment on intensification conducted by David et al, (Table ) to a commercial scale production. The general management for larvae, post larvae (PL), and broodstock follows the standard for M. rosenbergii hatchery production (Valenti & Daniels, ; Valenti et al, ).…”

“…Producers have been stocked 40–100 newly hatched larvae of M. rosenbergii per litre in clear water recirculating systems based on their own experiences (Daniels, D'Abramo, & Parseval, ; New, ; Valenti, ; Valenti & Daniels, ; Valenti et al, ). Nevertheless, increasing the stocking density up to 140 larvae per L is technically feasible in clear water recirculating systems and does not negatively impact water quality, productivity, and animal welfare (David, Cohen, & Valenti, ). These results indicate that intensification beyond the levels currently used by farmers may be useful to improve M. rosenbergii hatchery economic performances.…”