ResumoEste estudo teve como objetivo descrever as variações espaço-temporais da ictiofauna em uma laguna costeira aberta. Os peixes foram coletados na Lagoa da Conceição, Florianópolis-SC, totalizando 19 meses de amostragem entre outubro de 1987 e novembro de 1989. Foram realizadas coletas em sete pontos, sendo que em cada um foram empregados lances de tarrafa de diferentes malhas, rede de mão do tipo puçá, rede de arrasto de praia e pesca manual com anzóis. Foram coletados 8.299 indivíduos, classiicados em 61 espécies pertencentes a 28 famílias de peixes, totalizando 52.902,4 g. Em relação à permanência na laguna, 48 espécies (80%) foram classiicadas como visitantes e as outras 12 eram residentes. Foram observadas diferenças signiicativas entre as estações (n, biomassa, riqueza de espécies e H'Loge), entre as áreas (n e riqueza de espécies) e nas interações entre os fatores estação e área (n e biomassa). Os dados sobre a ictiofauna reforçam a importância ecológica do ambiente da laguna costeira como área berçário e de alimentação, já que a maioria das espécies encontra-se em fases de recrutamento dentro da Lagoa da Conceição. Palavras-chave: Ictiofauna; Laguna; Variação espaço-temporal Revista Biotemas, 28 (3), setembro de 2015 94 D. Borgo et al. Abstract Are the ish distribution patterns in an open coastal lagoon in the subtropical west Atlantic inluenced by spatial and seasonal variations?This study aimed to describe the spatial-temporal variations of the ish fauna in an open coastal lagoon. Fish were collected in Lagoa da Conceição, Florianópolis, Santa Catarina, Brazil, totaling 19 sampling months between October 1987 and November 1989. Sampling took place at 7 sites, and in each of them cast net throws of different meshes, "puçá" handheld ishing net, beach seine ishing net, and manual ishing hooks were used. A total of 8,299 individuals were collected, classiied into 61 species belonging to 28 ish families, totaling 52,902.4 g. Regarding stay in the lagoon, 48 species (80%) were classiied as visitors and the other 12 were residents. Signiicant differences were observed between seasons (n, biomass, species richness, and H'Loge), between areas (n and species richness), and in the interactions between the factors season and area (n and biomass). Data on ish fauna reinforce the ecological signiicance of the coastal lagoon environment as a nursery and feeding area, since most species are at recruitment stages within Lagoa da Conceição.

Basic data on species composition and abundance are essential to subsidize the development of effective actions for conservation of biological diversity and to identifying the effects arising from these actions. This work provides an updated checklist of the fish species occurring in the proposed Baía da Babitonga marine protected area (southern Brazil) as well as their abundance, ontogenic stage and conservation status, based on multi-site data collected in shallow water and deeper zones of the main channel and from published literature. A total of 152 fish species belonging to 18 orders and 53 families were registered, with 29 species being reported for the first time in Baía da Babitonga. Among the registered species, the exotic blenny Omobranchus punctatus (Valenciennes) was the most unexpected. The most species-rich families were Sciaenidae (18), Carangidae (15), Engraulidae (9), Paralichthyidae (8), Epinephelidae (8) and Gobiidae (7). Nine species inhabiting Baía da Babitonga are classified as globally threatened, and 17 species are classified as nationally overexploited; four of these species are on both global and national red lists.

Estuarine beaches are low energy environments found along the coast in several protected places around the world, such as estuaries, bays or areas protected by submerged bars or coral reefs. Although common, these places have been poorly studied. Using a seine net, six beaches were sampled along an environmental gradient for 12 months. During this period, an increase of the dominant species following the increase in salinity and energy values was observed, whilst the opposite pattern occurred for species richness and abundance. Univariate and multivariate analyses showed spatial and temporal variations between beaches and months. Depth and marginal habitats appear to be more important factors than wave height and period, temperature, salinity and pH, which are normally used to describe fish habitat utilization patterns in beaches and estuaries. Nevertheless, specific sampling designs should be proposed to evaluate properly these questions.

Trawl fisheries are non-selective technique. The aim of this study was to characterize the bycatch of trawling vessels motorized with more than 45 HP. Monthly samples were deployed between August 2000 and July 2001 for large boat and August 2004 and July 2005 for medium boat off the coast of Paraná. The large and medium boat caught 45,277 and 57,387 fishes respectively. With both vessels were captured 99 taxon. Sciaenidae was the most representative family in number of species and individuals. There were differences in fish fauna between seasons and areas among south and north of the Paranaguá estuarine complex inlet for large and medium boat. The different fleet fishing the same resource but the bycatch impact with respect to species richness and abundance are different and management measures, like bycatch reduction devices, should take into account the vessel's and nets characteristics.

RESUMODispositivos para a redução da captura da fauna acompanhante (BRD) são modificações tecnológicas instaladas em redes de arrasto a fim de evitar ou reduzir a mortalidade indesejada oriunda da pesca. Foram examinadas as perspectivas para o uso de BRD na pesca artesanal de arrasto na costa sul brasileira a partir de uma revisão em três níveis. A primeira tratou de uma breve descrição da gestão pesqueira no Brasil (GP). A seguir, foram revisados conceitos a partir do enfoque ecossistêmico aplicado à pesca (EAF) e da cogestão adaptativa (ACM). Por fim, os resultados dos experimentos com o uso de BRDs na pesca artesanal do litoral do Paraná foram sintetizados e analisados com base em três critérios provenientes do EAF e ACM (potencial para processos participativos, diálogo de saberes e gestão adaptativa). Foram identificados quatro ciclos institucionais que demonstram condições limitadas para a adoção de novas abordagens da gestão, especialmente a adoção de BRD além de uma modificação técnica. Contudo, partindo de uma perspectiva ampliada de gestão, torna-se importante testar os BRDs em diferentes contextos, a partir da compreensão avançada da dinâmica dos sistemas pesqueiros artesanais, da participação efetiva dos pescadores, do uso de abordagens participativas de pesquisa e de gestão, do envolvimento gradativo dos gestores nos experimentos e de uma comunicação contínua sobre resultados dos experimentos para os diferentes espaços de gestão pesqueira. Palavras chave: Xiphopenaeus kroyeri; gestão ecossistêmica; modificações tecnológicas; cogestão adaptativa STRATEGIES FOR BYCATCH REDUCTION AT SMALL-SCALE SHRIMP TRAWL FISHING: PERSPECTIVES FOR FISHERIES MANAGEMENT ABSTRACTBycatch reduction devices (BRD) are technical modifications installed in trawl nets in order to avoid or to reduce unwanted fishing mortality. We examined the perspectives of use of BRD on the Southern Brazilian artisanal trawl fishery at three levels. Firstly, we briefly described Brazilian Fisheries Management (BFM) from the past 50 years. Secondly, we reviewed concepts in Ecosystem Approach to Fisheries (EAF) and Adaptive Co-Management (ACM) approach. Finally, we summarized some of the findings from experiments with the use of BRD on a small-scale fishing boat at the coast of Paraná based on three criteria from EAF and ACM (potential for participatory approach, knowledge bridging and adaptive management). We identified four institutional cycles, which showed limited conditions to the adoption of new fisheries management approaches, especially in terms of the adoption of BRD beyond a technical modification. However, from a wider fisheries management perspective, it's important to experience BRDs in different scenarios, through comprehension of dynamic of fisheries systems, participation of fishers, use of participatory approaches on research an management, engagement of decision makers, and the continued communication between experiments and fisheries management arenas.