Marcelo Barbosa Henriques

Effects of low salinity on juvenile pink shrimp Farfantepenaeus paulensis (Perez-Farfante 1967, Crustacea)

It is of paramount importance to study salinity tolerance of commercially important crustaceans, such as the pink shrimp Farfantepenaeus paulensis to determine possible mortality causes in the wild and in aquaculture in oligohaline waters. The aim of this study was to determine the lethal salinity concentration (LC50) for juvenile pink shrimp F. paulensis and measure its oxygen consumption and ammonia excretion at different salinity levels. Shrimp of two length classes (49.4 ± 4.3 and 78.5 ± 5.5 mm) were placed in 10-L containers and exposed to salinity levels of 35, 30, 25, 20, 15, 10 and 5. The experiments were tripled, with seven shrimp in each container. The average lethal concentration (LC50s) for an exposure of 24 h was 13.33 (11.26–15.78) and 10.26 (8.60–12.64), respectively, for the two classes of juveniles. For an exposure of 48 h, LC50s were 12.71 (10.68–15.12) for the larger animals and 9.20 (7.34–11.52) for the smaller ones. There was an inverse relationship between salinity and rates of oxygen consumption and ammonia excretion. The average reduction in specific oxygen consumption in salinities 20, 25 and 30 showed a decrease in metabolic rate of 63, 80 and 82%, respectively, in relation to salinity level 0. The same occurred for the averages of ammonia excretion at salinity levels of 15, 20, 25, 30 and 35, which represented low metabolic rates of 57, 61, 70, 71 and 74% respectably in relation to salinity level 0.

Oxygen consumption and ammonia excretion of juvenile pink shrimp (Farfantepenaeus paulensis) in culture: temperature effects

We evaluated oxygen consumption and ammonia excretion by juveniles of the pink shrimp Farfantepenaeus paulensis at three different temperatures (15, 20 and 25 °C). The shrimp were collected in the coastal region of Cananéia, São Paulo State, Brazil. The selected temperatures are the limits recorded in aquaculture tanks in the coastal region of Cananéia. We measured oxygen consumption and ammonia excretion as proxies for metabolic activity. Oxygen consumption and ammonia excretion increased with increasing temperature, but no change was observed at 15 and 20 °C. It is possible that within this temperature range, there is thermal independence in juvenile F. paulensis do not need to allocate additional energy to compensate for temperature changes because they are physiologically adapted for this range.

A integracao da pesquisa ao conhecimento ecologico local no subsidio ao manejo: Variacoes no estoque natural da ostra de mangue Crassostrea spp. na Reserva Extrativista do Mandira, Cananeia-SP, Brasil

Este estudo teve o objetivo de descrever uma experiencia de integracao entre conhecimento cientifico e comunitario no subsidio ao manejo, a partir das avaliacoes do estoque da ostra de mangue Crassostrea spp. na Reserva Extrativista do Mandira, baseadas em estudos populacionais e no Conhecimento Ecologico Local (CEL) e percepcao da comunidade. Os dados dos estudos populacionais apresentaram aspectos concordantes com o Conhecimento Ecologico Local, evidenciando variacoes no estoque de ostras na Reserva.

Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn in mussels collected in Santos bay, São Paulo, Brazil: limits required by local legislation

This study quantified and evaluated the concentrations of trace elements Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn in mussels Perna perna collected in Urubuqueçaba island, Santos Bay, São Paulo, Brazil. This region presents port and industrial activities, as well as high population densification. The collections in natural mussel beds occurred in eight campaigns, two per season of the year, totaling 240 samples, from April 2010 to June 2011. The determination of the concentration of trace elements was performed using the Atomic Absorption Spectrometer (AAS) Flame. The statistical analysis used the PAST Software 1 using p <0.05 as significant. Average concentrations in μg g-1 wet weight obeyed the order Cd (0.11), Cr (0.37), Pb (0.38), Cu (1.63), Ni (2.31), Mn (2.33), Zn (27.11), Fe (179.97) and Al (375.23). The results were compared with other studies of mussels and Brazilian standards that establish maximum allowable concentrations for human consumption, only Cr showed concentrations above those permitted by Brazilian standards.

Economic analysis of scallop culture at the north coast of São Paulo State, Brazil.

The aim of this study was to analyze economically the production of scallops Nodipecten nodosus at the north coast of São Paulo State, from a hypothetical cultured area of 0.2 ha. We used a final density of 16 scallops floor-1 of Japanese lanterns and considered a survival rate of 68.85% and 81.22% at the final cycle of nine months. In these conditions, the intern rate of return (IRR) ranged from 40.58% a 103.99%, based in commercial selling prices of R

Elementos-traço metálicos em mexilhões da Ilha Urubuqueçaba, na Baía de Santos, Brasil

39.50 and R

Reproductive characters of the oyster Crassostrea brasiliana from mangroves of the Cananéia estuary, São Paulo, Brazil (25°S; 48°W).

49.50a per dozen for the two survival rates. The total production cost (TPC) per dozen of scallops varied from R

Determinaçäo dos teores de Hg, Pb, Cd, Cu e Zn em moluscos (Crassostrea brasiliana, Perna perna e Mytella falcata)

24.27 to R

A criação de rãs como proposta de agronegócio na aquicultura: viabilidade econômica baseada em conversão alimentar

28.63, lower than the considered selling prices. The highest net present value (NPV) obtained was R

Estimativa de estoque do mexilhão Perna perna e da espécie invasora Isognomon bicolor em bancos naturais da baía de Santos, São Paulo, Brasil

989,376.35 for the selling price of R