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Search Results: 1 - 10 of 378529 matches for " P. R SCHWINGEL "
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A PRELIMINARY STUDY ON THE TROFIC ECOLOGY OF Sardinella brasiliensis OFF SOUTHERN BRAZIL ESTUDO PRELIMINAR DA ECOLOGIA TRóFICA DA Sardinella brasiliensis NA COSTA SUDESTE DO BRASIL
F. SCHNEIDER,P. R. SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2000,
Abstract: The feeding ecology of the brazilian sardine Sardinella brasiliensis was studied on the Brazilian continental shelf, from 22°S to 29°S. Based on the Index of Relative Importance (IRI) the diet S. brasiliensis was analysed qualitatively and quantitatively in autumn, winter and spring. An indirect volumetric analysis (called individual volume method) was also performed where food items were classified as geometric bodies and mean volumes were calculated for each food item. The length distribution of sardine in the bulk of the samples varied mainly between 170 and 200 mm. S. brasiliensis prey on a broad variety of phytoplankton and zooplankton organisms, including diatoms, dinoflagellates, tintinnids, copepods, decapods and amphipods. In the stomach contents of S. brasiliensis 27 different taxa were identified; 11 phytoplankton and 16 zooplankton taxa. The zooplankton fraction represented 74,2% of the total prey volume in the sardine stomachs in autumn, 36,8% in winter and 99,8% in spring. The diatom Coscinodiscus spp. and copepods were volumetrically the most important taxa in the diet. Among copepods, the cyclopoid Oncaea sp., the harpaticoid Microsetella norvegica, calanoids Centropages sp., Temora stylifera and Candacia curta were the most important species in the diet. Larvae of Brachyura and the amphipod Lestrigonus sp. constituted a large volume in the stomach contents. S. brasiliensis was found to be an omnivore species, which preys on zooplankton, but that is able to switch to filter-feeding on phytoplankton and microzooplankton. A ecologia trófica da sardinha verdadeira Sardinella brasiliensis foi estudada na plataforma continental do Brasil, de 22°S até 29°S. A dieta da S. brasiliensis foi analisada qualitativamente e quantitativamente para o outono, inverno e primavera baseado no índice de Importancia Relativa (IRI). A análise volumétrica indireta (chamada método volume individual) foi realizada de forma que os itens alimentares s o comparados a formas geométricas, e assim, volumes calculados. A distribui o de comprimento da sardinha variou principalmente entre 170 e 200 mm. As presas apresentaram uma variedade de organismos fitoplanct nicos e zooplanct nicos, incluindo diatomáceas, dinoflagelados, tintinnídeos, copépodos, decápodas e amfípodas. No conteúdo estomacal da S. brasiliensis foram identificados 27 taxa diferentes, 11 taxa de fitoplancton e 16 taxa de zooplancton. A fra o zooplanct nica representou 74,2% no volume total de presas no outono, 36,8%no inverno e 99,8% na primavera. A diatomácea Coscinodiscus spp. e os copépodos foram vo
SPATIAL – TEMPORAL VARIATIONS OF CPUE OF GENUS RHINOBATOS (RAJIFORMES, RHINOBATIDAE) IN SOUTHEASTERN AND SOUTHERN COAST OF BRAZIL VARIA O ESPA O-TEMPORAL DA CPUE PARA O GêNERO RHINOBATOS (RAJIFORMES, RHINOBATIDAE) NA COSTA SUDESTE E SUL DO BRASIL
R. R. MARTINS,P. R SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2003,
Abstract: Two species of guitarfish, Rhinobatos percellens and R. horkelli, are found off southeastern and southern coast of Brazil. Both are components of a multiespecific fishery of double-rig, pair and single trawl. Catches and CPUE of guitarfish were decreasing sharply during last decade. This present work analyzed the spatial-temporal variations of catch per unit effort of guitarfish off southeastern and southern coast of Brazil, through analysis of CPUE data from trawlers fishery, which landed in state of Santa Catarina, between 2000 and 2002. The guitarfish catches was concentrated between Imbituba-SC and Chuí-RS. A pattern of spatial-temporal variations of catches have not been observed, however, did occur spring and summer high to pair and double-rigs trawlers catches. In the period of study was observed an improvement of guitarfish CPUE that could be a sign of disponibylity increase. The pair trawlers actuated principally in lower than 100m deeps, in spit of double-rig and other trawler operated, from 2001, in high deeps reaching bigger CPUE. These displacements of trawlers to deeper water explain the increment of guitarfish CPUE that was observed between 2000 and 2002. Na costa sudeste e sul do Brasil, ocorrem duas espécies do gênero Rhinobatos, i.e Rhinobatos percellens e R. horkelli, estas fazem parte das capturas da pesca multiespecífica das frotas de arrasto duplo, parelha e simples, sendo que a captura da raia-viola vem diminuindo crescentemente desde a última década, juntamente com sua CPUE. Este trabalho analisou a varia o espa o-temporal da CPUE da raia-viola na costa sudeste e sul do Brasil, através do cálculo da CPUE mensal e análise da distribui o das capturas realizadas pela frota arrasteira que desembarcou no estado de Santa Catarina entre 2000 e 2002. Neste período as capturas de raiaviola se concentraram entre Imbituba - SC e Chuí - RS. Um padr o de varia o espa o-temporal das capturas n o foi observado, entretanto, ocorreram picos de primavera e ver o para capturas com arrasto duplo e de parelhas em 2001 e 2002. No período de estudo, verificou-se um incremento da CPUE para a raia-viola em compara o à década de 1990, o que pode ser um indicador do aumento de sua disponibilidade. A frota de arrasto de parelha atuou principalmente em profundidades inferiores a 100m, enquanto as frotas de arrasto duplo e simples operaram, a partir de 2001, em maiores profundidades (>100m), alcan ando CPUE mais elevadas. Este deslocamento das frotas de arrasto para regi es mais profundas, explicam o aumento da CPUE para a raia-viola observado no período
BIOLOGICAL ASPECTS OF PELAGIC LONGLINE CAUGHT SPECIES IN SOUTH REGION OF TRINDADE AND MARTIN VAZ ISLANDS IN SUMMER OF 2001 ASPECTOS DA BIOLOGIA DAS ESPéCIES CAPTURADAS POR ESPINHEL PELáGICO NA REGI O SUL DAS ILHAS DE TRINDADE E MARTIN VAZ NO VER O DE 2001
R. C. MAZZOLENI,P. R. SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2002,
Abstract: The present work describe biological aspects of species captured with pelagic longline in south regions of Trindade and Martin Vaz islands, between 22oS-26oW to 25oS-40oW. Data about reproduction and feeding ecology of different species are analised. O presente trabalho descreve aspectos da biologia das espécies capturadas com espinhel pelágico na regi o sul das ilhas de Trindade e Martin Vaz, entre 22oS-26oW a 25oS-40oW. Dados sobre reprodu o e alimenta o das espécies s o analisados.
ELASMOBRANCH SPECIES LANDED IN ITAJAí HARBOR, SOUTHERN BRAZIL ESPéCIES DE ELASMOBR NQUIOS DESEMBARCADAS NO PORTO DE ITAJAí, SUL DO BRASIL
R. C. MAZZOLENI,P. R. SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2000,
Abstract: Fishing activity in the Itajaí harbor (SC) has concentrated a large fishing fleet, operating with many different methods of capture. This paper presents a checklist of the species of elasmobranchs landed in Itajaí, and analyses the respective landing frequencies in the fishing methods. Elasmobranchs were observed in catches of purse seine, single trawl, double rig trawl, pair trawl, surface longline, bottom longline, surface gillnet, bottom gillnet and traps. In total, 85 species were found (54 sharks and 31 skates and rays) and of them, 22 shark species and 6 skates were very abundant in at least one fishing art. O porto pesqueiro de Itajaí (SC) tem crescido muito rapidamente, concentrando uma grande e diversificada frota que utiliza diferentes artes de pesca. No presente trabalho foram identificadas as espécies de elasmobranquios desembarcadas, as artes de pesca que as capturam e suas freqüências nas descargas. Um total de oito artes capturam elasmobranquios: cerco, arrasto de tangones e parelha, espinhel de superfície e de fundo, emalhe de superfície e de fundo, e covos. Encontrou-se um total de 85 espécies (54 tubar es e 31 raias), sendo que 22 espécies de tubar es e 6 de raias apresentaram-se abundantes em pelo menos uma arte de pesca.
BIOLOGICAL ASPECTS OF PELAGIC LONGLINE CAUGTH SPECIES IN WINTER 2001 OFF SOUTH BRAZIL ASPECTOS DA BIOLOGIA DAS ESPéCIES CAPTURADAS POR ESPINHEL PELáGICO NA COSTA SUL DO BRASIL NO INVERNO DE 2001
P. R SCHWINGEL,R. C MAZZOLENI
Brazilian Journal of Aquatic Science and Technology , 2004,
Abstract: The present work describes biological aspects of species caught with pelagic longline off Rio Grande do Sul State, Brazil, between 30oS to 35oS. Results point this area as a possible feeding ground of pelagic predators like sharks, swordfish and tunas. Data revealed this area as a parturition location for females blue sharks Prionace glauca. O presente trabalho descreve aspectos da biologia das espécies capturadas com espinhel pelágico na regi o oceanica frente ao Estado do Rio Grande do Sul, Brasil, cobrindo a área entre 30oS e 35oS. Os resultados indicam o uso da área como possível sítio de alimenta o para grandes predadores pelágicos como tubar es, espadartes e atuns. Os dados indicam ainda a área como um local utilizado por fêmeas de tubar o-azul Prionace glauca para o parto.
DESCRIPTION AND ANALYSIS OF THE TEMPORAL VARIATION OF THE PURSE-SEINE FLEET OPERATION IN ITAJAí HARBOR, BRAZIL, BETWEEN 1997 AND 1999. DESCRI O E ANáLISE DA VARIA O TEMPORAL DA OPERA O DE PESCA DA FROTA DE TRAINEIRAS DO PORTO DE ITAJAí, SC, ENTRE 1997 E 1999.
P. R. SCHWINGEL,D. S OCCHIALINI
Brazilian Journal of Aquatic Science and Technology , 2003,
Abstract: xThe main fishing fleet that lands in Itajaí harbor, Brazil, is the purse-seine one, which represents 30% of the landed weight. This fleet has as target species the Brazilian sardine (Sardinella brasiliensis). The objective of this work is to describe and to analyze the temporal variations of the fishing operation of the purse-seiners between 1997 and 1999. The analyzed aspects were: (1) description of the fleet using the ships length, motor power, crew size, skull and conservation type, hold capacity, and net’s length and height; and (2) temporal variation of the fishing operation using number of tows per trip, time and duration of tows, number of days at sea per trip, number of fishing days per trip and searching time of schools. In the analyzed period, a total of 797 records were obtained. In general, the fleet description indicated that there was an increase of the fishing power in the last 10 years, in spite of the reduction of the number of ships. On the other hand, the results suggest that the characteristics of the fishing operation are related with the oscillations of the target species availability. A principal frota que desembarca no porto pesqueiro de Itajaí, SC, é a frota de traineiras, a qual representa 30% do peso dos desembarques. Essa frota tem como espécie-alvo a sardinhaverdadeira (Sardinella brasiliensis). O objetivo deste trabalho é descrever e analisar as varia es temporais da opera o de pesca da frota de traineiras entre 1997 e 1999. Os aspectos analisados foram: (1) descri o da frota através do comprimento dos barcos, potência do motor, número de tripulantes, tipo de casco e conserva o, capacidade do por o e comprimento e altura da rede de cerco; e (2) varia o temporal da opera o de pesca através do número de lances por viagem, tempo de dura o dos lances, número de dias no mar por viagem, número de dias de pesca por viagem e tempo de procura. No período analisado foram obtidos um total de 797 registros. De forma geral, a descri o da frota indica que houve um aumento do poder de pesca nos últimos 10 anos, apesar da redu o do número de barcos. Por outro lado, as características da opera o de pesca foram relacionadas com as flutua es na disponibilidade da espécie-alvo.
SPATIAL AND TEMPORAL VARIATION OF RELATIVE CAPTURE OF PURSESEINING FLEET BETWEEN 1997 AND 1999 IN ITAJAí HARBOR, SC COMPOSI O E VARIA O ESPA O-TEMPORAL DA CAPTURA DA FROTA DE TRAINEIRAS ENTRE 1997 E 1999 NO PORTO DE ITAJAí, SC
D. S OCCHIALINI,P. R SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2003,
Abstract: The purse seining fleet that lands in Itajaí harbor, SC, fishes in a large region of southern coast off Brazil, concentrating its activities on the continental shelf between Imbituba (28°20’S) and Ubatuba (23°20’S) in depths from 10m to 70m. The objective of the present study is to verify the relative capture of purse-seiners and the spatio-temporal variation of landings between 1997 and 1999. A total of 753 landing records were analyzed. The continental shelf was divided in 4 sectors: Imbituba-Itajaí (sector 5), Itajaí-Cananéia (6), Cananéia-Santos (7) and Santos-Ubatuba (8) and those subdivided in depths up to 40 m (sub-sector a) and between 40 and 80 m (b). The Brazilian sardine (Sardinella brasiliensis) was the dominant species captured in all sectors, representing, on average 87% of the landings in 1997, and only 40% in 1999. The atlantic thread herring (Opisthonema oglinum) occured in the sectors 5ab and 6ab, and corresponded to 15% of the captures, while the atlantic bumper (Chloroscombrus chrysurus) was a species captured exclusively in depths up to 40 m in sectors 6 and 7. Both species increased their participation in the captures between 1997 and 1999. Demersal species, such as white croaker (Micropogonias furnieri) and catfish (Netuma spp.), occurred exclusively in depths up to 40 m in sectors 5 and 6, exhibiting significant landings since 1998. In general, the results suggest that the most important fishing area of the purse-seiners was between Itajaí and Cananéia and that the fishery changed from mono to multispecific in the studied period. A frota de traineiras que desembarca no porto pesqueiro de Itajaí, SC, atua em uma ampla área da costa sudeste-sul do Brasil, concentrando suas atividades na plataforma continental entre Imbituba (28°20’S) e Ubatuba (23°20’S) em profundidades de 10 m até 70 m. O objetivo deste trabalho é verificar a composi o da captura e a varia o espa o-temporal nos desembarques da frota de traineiras entre 1997 e 1999. Um total de 753 registros de desembarques foram analisados. A plataforma continental foi dividida em 4 setores: Imbituba-Itajaí (setor 5), Itajaí-Cananéia (6), Cananéia-Santos (7) e Santos-Ubatuba (8) e esses subdivididos em profundidades até 40 m (subsetor a) e de 40 a 80 m (b). A sardinha-verdadeira (Sardinella brasiliensis) foi a principal espécie capturada em todos os setores, representando uma média de 87% dos desembarques em 1997 e reduzindo para 40% em 1999. A sardinha-lage (Opisthonema oglinum) ocorreu nos setores 5ab e 6ab, representando, em média, 15% das capturas enquanto a palombeta (Chlor
STUDY OF PHYSICAL-CHEMICAL VARIABLE IN THE SEE WATER AND THE TANK WATER OF LIVE BAIT IN TUNA FISHING VESSEL ESTUDO DAS VARIáVEIS FíSICO-QUíMICAS DA áGUA DO MAR E DAS TINAS DE ISCA VIVA EM BARCOS ATUNEIROS
A. F. CAMPOS,P. R SCHWINGEL,K. C. PEREIRA
Brazilian Journal of Aquatic Science and Technology , 2002,
Abstract: The main purpose of the present work is to determine physico-chemical differences (dissolved oxygen, pH, salinity, nitrite, ammonia, temperature) between sea water and the tank water used for keeping live bait in a tuna fishing vessel. The study was conducted onboard the tuna vessel “Kowalski V”, around the Macuco island and Bombinhas coast (Santa Catarina, Brazil) in January 2000. The main live bait were clupeid fishes (Sardinella brasiliensis and Anchoa spp.). The results revealed the presence of ammonia in tank water, which, associated with high values of pH, can reduce the fish immunity and increase mortality. In general, the dissolved oxygen in the tank indicated a negative anomaly of 2 mg/l. Temperature, salinity and pH showed nonsignificant differences. Esse trabalho tem como objetivo determinar diferen as nas variáveis físico-químicas (oxigênio dissolvido, salinidade, pH, nitrito, am nia, temperatura) entre a água das tinas e do mar durante a captura e manuten o das iscas vivas em barcos da frota atuneira. O trabalho foi realizado durante o cruzeiro do barco “Kowalski V”, na enseada de Bombinhas e entorno da ilha do Macuco, SC, entre 13 a 21 de janeiro de 2000. Os peixes utilizados como isca viva foram sardinha-verdadeira (Sardinella brasiliensis) e boqueir o (Anchoa spp). O resultado das análises de água das tinas mostrou a presen a de am nia, que associada a valores altos de pH pode ocasionar queda de imunidade e causar a mortalidade de peixes devido sua toxidez. Em geral, o oxigênio dissolvido nas tinas apresentou uma diferen a negativa de 2 mg/l em rela o a água do mar. Temperatura, salinidade e pH n o mostraram diferen as significativas.
MANAGEMENT OF A NEW MONKFISH (Lophius gastrophysus) FISHERY IN SOUTHERN BRAZIL O ORDENAMENTO DE UMA NOVA PESCARIA DIRECIONADA AO PEIXE-SAPO (Lophius gastrophysus) NO SUDESTE E SUL DO BRASIL
J. A. PEREZ,P. R. PEZZUTO,H. A. ANDRADE,P. R SCHWINGEL
Brazilian Journal of Aquatic Science and Technology , 2002,
Abstract: A monkfish (Lophius gastrophysus) fishery developed in southern Brazil during 2001 through the multispecific deep-water operations (>100 m depth) of a national trawling fleet and through the gill net fishing operations conducted by a specialized chartered foreign fleet. Due to the increasing interest in such resource, the Department of Fishing and Aquaculture (Ministry of Agriculture) launched a management initiative that included (a) the collection of biological and technological information, (b) the assessment of the stock and the fishery, (c) the public debate of these assessments with the Brazilian fishing industry, government and scientists and, finally, (d) the definition of management actions for the 2002 fishing season within a Permanent Committee established for the management of deep-water demersal resources (Ministry of Agriculture). The present work summarizes this management initiative mostly conducted by CTTMar-UNIVALI fishery science group under a scientific cooperation program with the Ministry of Agriculture. It includes a diagnosis of the monkfish fishery in 2001, a description of procedures and criteria adopted for the estimate of the resource sustainable levels of exploitation and, finally, a list of objective recommendations as subsidies to the definition of the management actions for the 2002 fishing season. Lastly a public presentation and debate of the information raised and the proposed recommendations is described as the culmination of a dynamic and participative unseen process of fishing management in Brazil. A pescaria do peixe-sapo (Lophius gastrophysus) desenvolveu-se no Sudeste e Sul do Brasil através da atividade multiespecífica da frota de arrasteiros operando a mais de 100 m de profundidade e de uma pescaria de emalhe dirigida, composta por embarca es estrangeiras arrendadas especializadas na captura e processamento a bordo desse pescado. Devido ao crescente e descontrolado interesse por essa espécie durante 2001, o Departamento de Pesca e Aqüicultura (Ministério da Agricultura, Pecuária e Abastecimento, MAPA) desencadeou um processo de ordenamento dessa pescaria, abrangendo as fases de (a) coleta de informa es tecnológicas, biológicas e pesqueiras, (b) avalia o do estoque e da pescaria, (c) apresenta o para o setor produtivo, governamental e científico, da referida avalia o e das subseqüentes recomenda es para o ordenamento e, finalmente, (d) tomada decis o sobre medidas de ordenamento da pescaria a serem implementadas em 2002, dentro do Comitê Permanente de Gest o (CPG) de Recursos Demersais de Profundidade. O p
Phytoplankton composition of the Camboriú watershed (SC, Brazil) during summer 2005 Composi o do fitoplancton da bacia hidrográfica do Rio Camboriú (SC, Brasil) durante o ver o de 2005
A. Antunes,P. R. Schwingel,A. L. M. Burliga,S. Urban
Brazilian Journal of Aquatic Science and Technology , 2007,
Abstract: Pollution of surface freshwaters is one of the main environmental problems that result from antrophic activities. Comprehensive studies concerning water quality, however, demand a general understanding of the related aquatic ecosystems. In particular, water quality can be assessed by analyzing phytoplankton composition and diversity which tend to reflect extreme hydrological pertubations. The present study focus on the qualitative description of microphytoplankton, spatial variability of species composition and the creation of a reference collection of these algae in the Camboriu Watershed (Santa Catarina, Brazil) during summer 2005. Sampling was conducted in 9 stations along the basin. After taxonomic identication of the microphytoplankton, a similarity analysis was applied among all sampling stations. A total of 87 taxa of phytoplankton were identified distributed in classes Cyanophyceae (n= 14), Chlorophyceae (n= 19), Zygnematophyceae (n= 11), Euglenophyceae (n= 8), Bacillariophyceae (n= 34) and Crysophyceae (n= 1). Sampling stations located near the potamon environments showed highest values of total richness and those stations located near the rhithron environments the lowest richness values. The similarity analysis among stations revealed four dissimilar groups, separated into, urban, peri-urban, rural and naturial areas. Pollution of surface freshwaters is one of the main environmental problems that result from antrophic activities. Comprehensive studies concerning water quality, however, demand a general understanding of the related aquatic ecosystems. In particular, water quality can be assessed by analyzing phytoplankton composition and diversity which tend to reflect extreme hydrological pertubations. The present study focus on the qualitative description of microphytoplankton, spatial variability of species composition and the creation of a reference collection of these algae in the Camboriu Watershed (Santa Catarina, Brazil) during summer 2005. Sampling was conducted in 9 stations along the basin. After taxonomic identication of the microphytoplankton, a similarity analysis was applied among all sampling stations. A total of 87 taxa of phytoplankton were identified distributed in classes Cyanophyceae (n= 14), Chlorophyceae (n= 19), Zygnematophyceae (n= 11), Euglenophyceae (n= 8), Bacillariophyceae (n= 34) and Crysophyceae (n= 1). Sampling stations located near the potamon environments showed highest values of total richness and those stations located near the rhithron environments the lowest richness values. The similarity analysis among st
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