Nutritional Quality of the European Spiny Lobster Palinurus elephas (J.C. Fabricius, 1787) (Achelata, Palinuridae) and the Non-Indigenous Northern Brown Shrimp Penaeus aztecus Ives, 1891 (Dendrobranchiata, Penaeidae)

The European spiny lobster is a species of great commercial value, yet a limited scientific knowledge exists on its biology, ecology, and physiology, especially for the stocks from east Mediterranean waters. The northern brown shrimp, a non-indigenous established species, is commercially exploited in regions of the Mediterranean Sea. Both species’ proximate composition and fatty acid profile were assessed for the first time in the Mediterranean region, exhibiting an overall significant statistical difference. Protein, fat, and energy contents were significantly higher in the northern brown shrimp, whereas moisture and ash contents were significantly higher in the European spiny lobster. The proximate composition for both species was well within the reported range for other lobster and prawn species in the Mediterranean Sea.

Length-based assessment of southern brown shrimp stock from trawl fisheries on the Amazon Continental Shelf

Virtual Population Analysis (VPA) is a diagnostic tool that providing valuable input for management decisions to sustainable catches for marine fisheries. Industrial shrimp trawling produces one of the most valuable export commodities in the Brazilian fishery sector. Due to the profitability, there is pressure on government agencies to increase the number of fishing licenses. The present study used the body-length data available for the industrial southern brown shrimp trawling fleet of the Amazon Continental Shelf (ACS), Brazil, to estimate the current maximum sustainable yield and test the potential effects of increased effort on the sustainability of this fishery. The available data encompasses 13 years of onboard monitoring of shrimp trawling. The VPA was run in an Excel spreadsheet. The results indicate that the ACS shrimp stock has high fishing (F) mortality rates, although exploitation levels can be considered adequate below the MSY. An increase of up to 40% in fishery effort – including the expansion of the number of vessels – would not result in overfishing, although we would not recommend an increase in effort, as this may increase impacts on the bycatch fauna and eventual economic losses in the event of the failure of recruitment.

Culture Performance and Economic Return of Brown Shrimp (Metapenaeus Monoceros) at Different Stocking Densities Reared in Brackishwater Pond

Shrimp recognized as the white gold of Bangladesh because it is the second largest export earning product after garments sector. The brown shrimp (M. monoceros) have high growth rates together with that they tolerate wide ranges of salinity and environmental parameters which makes them highly attractive for culture purposes. The purposes of this research were to assess the culture performance and economic profitability of brown shrimp (Metapenaeus monoceros) in brackish water ponds. This research lasted from February to June 2020 under three different stocking densities such as 35, 45 and 55 individuals/m2 in treatments T1, T2 and T3 at Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna. After 90 days culture periods the total production was 1703.32±144.48, 2768.25±167.63 and 2535.03±253.52 kg/ha in T1, T2 and T3 respectively which was significantly higher (p<0.05) in T2 compared to T1 and T2. Benefit cost ratio (BCR) was 0.32, 0.87 and 0.52 in T1, T2 and T3 respectively and found significantly higher (p<0.05) in T2 than T1and T3. Both culture performance and economic analysis implies that brown shrimp (M. monoceros) with a stocking density of 450000 individuals/ha might be environment conciliatory and economically enduring in coastal areas of Bangladesh.

REPRODUCTION AND RECRUITMENT OF THE BROWN SHRIMP Penaeus subtilis IN THE AMAZON RIVER CONTINENTAL SHELF

This paper analyzes the pattern of the reproduction and recruitment of the pink shrimp Penaeus subtilis in the Amazon River continental shelf. Biostatistics samples obtained on board of industrial fishing vessels and in the estuaries of the northeastern state of Para were use in the analysis as well as monthly data on landings processed by commercial category. The sex ratio, for female and male respectively, was 61% to 39%, in the samples of commercial fishery, and 54% to 46%, in the samples of the estuary. The size at first maturity of females was estimated at 142.6 mm. The period of highest intensity of reproductive activity ranges from May to September. The settlement of post-larvae and residence period of juveniles in the estuary occurs with more intensity between June and September and the period of highest intensity of recruitment to the fishing areas begins in September extending until January of the following year. The main period of developing and maturing of the individuals ranges from November to July. It was observed a strong relationship between the hydrological cycle in the region, mainly the flow of Amazon River, and the life cycle of the species. Keywords: brown shrimp, sexual maturity, reproduction period, juvenile recruitment, Amazon.