Profitability and Sustainable Use of Traps for Amazon Shrimp (Macrobrachium amazonicum) From the Amazon River

Abstract

The objective of this study was to evaluate the profitability, productivity and selectivity of traps used for the capture of freshwater prawn using different spacings between the laths. This study was developed in the estuary of the Amazon River near Santana island, Amapá, Brazil. Collections were conducted using traps called “matapi”, which are cylindrical shrimp traps made with wooden slats or laths, with funnel-shaped entrances at both sides, and the spacings between the laths ranged between 1 to 10 mm in 1 mm increments. Each trap was covered with a net called a “sobrematapi”, or trap cover. The length of carapace in centimeters and the weight in grams were measured for all specimens. The shrimp were categorized into small, medium, and large size classes. Selectivity curves were used to determine selectivity for the different lath spacings. Traps with lath spacing below 7mm should be considered as being predatory because they allow for the capture of small individuals, with more than 50% of these being captured using spacings from 1 to 5mm. Despite the fact that spacings between 8 and 10mm captured lower quantities of shrimp, this enabled the capture of larger specimens with a similar total biomass yield, and this spacing is considered to be the most ecologically and economically viable. In order to minimize the capture of young shrimp without drastically affecting economic yield, it is suggested that shrimp trap lath spacings be above 6mm.

Effect of Dietary Carotenoids on Reproducers of Amazon River Prawn Macrobrachium amazonicum. Part 2: External Coloration, Accumulation of Astaxanthin in Body Tissues and Pigment Stability in Feed

“…The Amazon river prawn Macrobrachium amazonicum is a species of freshwater crustacean, diadromous, from South America (Fabri et al, 2019). Widely used for fishing in the northern region of the continent, in addition to aquaculture production with the rearing of juveniles captured in the wild and post larvae produced in the laboratory, extending their production to several locations in Brazil (Marques et al, 2012;Silva et al, 2017;Melo et al, 2020). Several researches have been directed to optimize their breeding in captivity, since it is a species with good acceptance by the consumer and good market value, relatively easy to grow and adapted to most growing conditions, including those integrated with other aquatic organisms (Flickinger et al, 2019;Dantas et al, 2020;Dutra et al, 2020;Lima et al, 2020).…”

Trampas Experimentales Para La Captura De Decápodos De Agua Dulce en Colombia

“…Las trampas para la colecta de diferentes grupos de crustáceos han sido utilizadas en diferentes escenarios tales como la pesca con fines comerciales o para investigaciones en ecología, biología, taxonomía o distribución de las especies (Arana, 2000;Arana & Vega, 2000;Retamal & Arana, 2000;Ahumada & Arana, 2009;Magaña-Gallegos et al, 2011;Melo et al, 2020;Ribeiro et al, 2020).…”