Bianca Bentes

Spatial distribution of the amazon river prawn Macrobrachium Amazonicum (Heller, 1862) (Decapoda, Caridea, Palaemonidae) in two perennial creeks of an estuary on the northern coast of Brazil (Guajará Bay, Belém, Pará)

Macrobrachium amazonicum is the most frequently consumed freshwater crustacean by river communities of the Amazon. Despite its relative abundance and vast knowledge on the species from data on cultivated specimens, little is known regarding its biology in the natural environment, especially its use of creeks that are strongly influenced by the tide. Specimens of Macrobrachium amazonicum were collected in September 2006 (dry season) and March 2007 (rainy season) from two perennial creeks of the Guajara Bay in the state of Para (northern Brazil), using traps similar to the matapis used by local fishermen to identify the spatial distribution of the species. Shrimps of all sizes use the tidal creeks in both seasons, including for breeding purposes. The greatest abundance of the species occurred in headwater areas and in the dry season. It is suggested that abundant allochthonous organic matter and the preference for protected areas may explain the abundance and breeding activity of this species in the headwaters of the creeks.

Multidisciplinary approach to identification of fishery production systems on the northern coast of Brazil

A pesca artesanal na costa Norte do Brasil e caracterizado por um conjunto de modalidades de pesca diferentes. Utilizando uma abordagem multidisciplinar, 20 sistemas de producao pesqueira foram identificados, com caracteristicas distintas em relacao a tecnologia e finalidade. As caracteristicas de cada sistema foram classificados em cinco dimensoes (ecologicas, economicas, sociais, tecnologicos e politicos). A analise de escalonamento multidimensional revelou que alguns destes 20 sistemas tem semelhancas maiores. Assim, um total de 10 grupos distintos foram identificados.

Population structure and relative growth of the Amazon shrimp Macrobrachium amazonicum (Heller, 1862) (Decapoda: Palaemonidae) on two islands in the fluvial-estuarine plain of the Brazilian Amazon

This study aimed to describe the population structure of the Amazon shrimp Macrobrachium amazonicum, as well as their relative growth between the length of the cephalothorax and the total length, and between the length of the cephalothorax and the total mass of shrimps of a fluvial-estuarine plain in the State of Para. Shrimps were sampled monthly from August 2006 to July 2007, using trawl nets, taking three replicates at each site (Arapiranga and Mosqueiro) per month, totaling 72 replicates. We caught 5,510 specimens, being 90.90% from Arapiranga Island and 9.1% from Mosqueiro Island. The highest densities occurred in July (1.33 individuals/m2), at the beginning of the dry season and in December (1.66 individuals/m2), at the beginning of the rainy season. The morphometric analysis for separate and grouped sexes resulted in negative and positive allometric growth. Ovigerous females were observed in all months, indicating continuous reproduction and the majority (67.81%) was caught during the less rainy season. The abundance and continuous reproduction of M. amazonicum show that this estuary offers conditions for the proper development of this population.

Biologia populacional do peixe pedra, Genyatremus luteus (Bloch, 1790), na costa amazônica brasileira

Genyatremus luteus is specie of commercial importance in the Pará state. In this study, the population biology of G. luteus was investigated in an estuary of the Eastern Amazon, the collections occurred from October 2012 to October 2013, each month, in the tidal channel (Furo grande), with block net. In the laboratory the individuals were gauged the lengths: total, standard, head and height, in addition to weight being recorded. After ventral incision and gonads removal, the gonadal stage was defined for females and males macroscopically. 460 individuals were captured whose sizes and weights ranged from 4.50 to 21.40 cm and 1.36 and 148.26 g. The relative frequencies of females and males were different than expected from 1: 1 (x2: 8.90, p <0.01), differing significantly by sex and size class (p <0.01). The mean size (CT) presented differences significant in relation to sex (F = 22.71, p <0.01), month (F = 35.80, p <0.01) (P <0.01), gonadal stage (F = 29.77, p <0.01) and gonadal stage by seasonal period (F = 2.37, p <0.05). The wet weight did not differ statistically by gonadal stage, seasonal period and sex. The ordering diagram showed that the turbidity was the variable that responded by the greater variability in the data (total of 97%). The specimens captured in this study are small in size and weight and reproductively immature, with higher occurrence of females, in greater numbers in the dry period.

DIAGNÓSTICO DA PESCA DE ARRASTO DE CAMARÕES MARINHOS NO ESTADO DE PERNAMBUCO, BRASIL

With a technical approach, this diagnosis aims to fill a gap in the overview of the activity, considering its technical aspects that manage the fishing effort of shrimping of Penambuco. From October 2013 to August 2014, the fishing grounds were identified used in this activity, as well as the fishing method, the number of boats and fishermen acting, type of boat and gears used. Analyses were performed with the major communities operating in this fishery (Recife, Jaboatao dos Guararapes, Barra de Sirinhaem and Sao Jose da Coroa Grande). The analyzes of the catch were tested using one-way ANOVA (α 5%). They observed two traditional types: the beach seining and trawing. It was cataloged about 50 vessels in the activity, with approximately 100 fishermen. They are caught mainly three types of shrimp: pink ( Farfantepenaeus spp.), Seabob ( Xiphopenaeus kroyeri ) and white ( Lithopenaeus schmitii ). Statistical data concentrated in the metropolitan area of Recife and Barra de Sirinhaem. There seems to be a direct relationship rainfall with shrimp production because with increased rainfall, there is a higher volume of landing fishery. Barra de Sirinhaem is the main area used in the State. Keywords: ‘mangote’; trawling fishing; pink shrimp; Farfantepenaeus spp.