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Submitted by Gisele Mara Hadlich (gisele@ufba.br) on 2019-01-08T17:51:50Z No. of bitstreams: 1 1-s2.0-S0025326X16306695-main.pdf: 1253949 bytes, checksum: 728a2afe8efe56d0d97dcfa6e0482261 (MD5) Approved for entry into archive by Jessica Alves (alves.jessica@ufba.br) on 2019-03-21T13:07:44Z (GMT) No. of bitstreams: 1 1-s2.0-S0025326X16306695-main.pdf: 1253949 bytes, checksum: 728a2afe8efe56d0d97dcfa6e0482261 (MD5) Made available in DSpace on 2019-03-21T13:07:44Z (GMT). No. of bitstreams: 1 1-s2.0-S0025326X16306695-main.pdf: 1253949 bytes, checksum: 728a2afe8efe56d0d97dcfa6e0482261 (MD5) Recent studies have revealed the occurrence of a natural process of interaction between oil droplets and suspended particulate material, resulting in the formation of aggregates which are dispersed in the water column, known as oil-suspended particulate material aggregates (OSAs). The experiments aimed to investigate the contribution of OSAS in indicating where most likely is the oil sedimentation in the São Paulo river, Todos os Santos Bay, Brazil, in order to predict possible ecotoxicological risks caused by oil spills. The results showed that salinity and MPS concentration interfere on the formation of aggregates. In addition, the point 3 was nominated as the most vulnerable area to the potential ecotoxicological impacts of oil spills and should be treated as a priority area for the application of preventive and mitigating techniques. Marine Pollution Bulletin

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2020-07-10T12:48:35Z No. of bitstreams: 1 2010 - Ana Paula da Penha Guedes.pdf: 3816399 bytes, checksum: ef3157df58db9224c4ee22d50c8b8854 (MD5) Made available in DSpace on 2020-07-10T12:48:37Z (GMT). No. of bitstreams: 1 2010 - Ana Paula da Penha Guedes.pdf: 3816399 bytes, checksum: ef3157df58db9224c4ee22d50c8b8854 (MD5) Previous issue date: 2010-06-07 Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq The aim of this study was to describe the feeding habits and trophic organization of the fish community in the Sepetiba Bay, based on the diet of the 24 most abundant fish species caught by bottom trawling between 2000 and 2001. We defined the ichthyofauna organization in trophic guild and their spatial, temporal and ontogenetic variations, behavioral aspects (trophic strategy, the trophic niche partition and feeding activity) and the feeding web organization to test the hypothesis that components of the ichthyofauna developed trophic segregation as strategy to coexist in this system. Fishes were measured (mm), weighted (g) and dissected for removing the stomachs. Stomachs contents were analyzed under optic microcopy and stereomicroscopy and the feeding items were identified at the lower possible taxonomic level. Four trophic guilds and two species with differentiated feeding were described for the studied species, indicating partition/overlapping in the use of the available resources. Spatial changes in diet were detected for most species, suggesting the high plasticity in the use of available resources. Overall, Polychaeta was the dominant feeding resource in the inner bay zone, while items from the Crustacean category dominated in the outer zone. Although indication of seasonality in the resource use have been detected, nine species change diet for the secondary items only, and some species change the main food item during one season only. Ontogenetic changes in the use of the resources were observed with Copepoda and Caprella predominating in the feeding of smaller individuals, which changed to Polychaeta and Teleostei in adult individuals. Five species (A. lineatus, C. chrysurus, D. rhombeus, H. clupeola e M. americanus) increased item diversity along the growth, while six species (C. leiarchus, C. spilopterus, P. punctatus, S. setapinnis, S. testudineus e T. lepturus) decreased the feeding spectrum. Generalist strategy was used for most species (19), however 15 from those species had a trend for specialism for a given food item. Aspistor luniscutis had the highest diversity of feeding items and width niche. Citharichthys spilopterus (diurnal) and A. lineatus (nocturnal) were the species with more defined feeding activity. Trophic guilds of the Copepoda and Polychaeta eaters had the highest trophic overlapping within the group, indicating plenty of available resources. No significant differences were found for the means trophic levels and omnivory of the species between zones, season and size classes. Connectance was influenced by removing species from the trophic web according to the degree of interaction of each species. Separation in trophic guild and the use of different trophic strategy were the mechanisms used for the ichthyofauna to coexist in the Sepetiba Bay. O objetivo deste estudo foi descrever os h?bitos alimentares e a organiza??o tr?fica da comunidade de peixes da Ba?a de Sepetiba, com base na dieta das 24 esp?cies de peixes mais abundantes, capturadas em arrastos de fundo trimestrais entre 2000 e 2001. Foi definida a organiza??o da ictiofauna em termos de guildas tr?ficas e suas varia??es espaciais, temporais e ontogen?ticas, bem como descritos os aspectos comportamentais (estrat?gia tr?fica, parti??o do nicho tr?fico e atividade alimentar) e a organiza??o das teias tr?ficas, visando testar a hip?tese de que os componentes da ictiofauna desenvolvem uma poss?vel segrega??o tr?fica como estrat?gia de coexist?ncia neste sistema. Os peixes foram medidos (mm), pesados (g) e dissecados em laborat?rio para a retirada do est?mago. Os conte?dos estomacais foram analisados sob microsc?pio estereosc?pio e/ou ?ptico, e os itens alimentares identificados ao n?vel taxon?mico mais inferior poss?vel. Quatro guildas tr?ficas e duas esp?cies com alimenta??o diferenciada foram descritas para as esp?cies de peixes estudadas, indicando a exist?ncia de parti??o/sobreposi??o no uso dos recursos dispon?veis. Mudan?as espaciais foram encontradas para a maioria das esp?cies, indicando uma plasticidade tr?fica na utiliza??o dos recursos dispon?veis. Em geral, Polychaeta foi o recurso alimentar dominante na zona interna, enquanto itens da categoria Crustacea dominaram na zona externa. Embora tenha sido registrada alguma sazonalidade no uso dos recursos, nove esp?cies apresentaram mudan?as apenas nos itens secund?rios e algumas esp?cies mudaram o item alimentar principal em somente uma esta??o. Mudan?as na utiliza??o dos recursos ao longo do crescimento foram observadas com o predom?nio de Copepoda e Caprella nos indiv?duos menores, mudando para Polychaeta e Teleostei nos indiv?duos maiores. Cinco esp?cies (A. lineatus, C. chrysurus, D. rhombeus, H. clupeola e M. americanus) aumentaram a diversidade de itens alimentares ao longo do crescimento, enquanto seis (C. leiarchus, C. spilopterus, P. punctatus, S. setapinnis, S. testudineus e T. lepturus) diminu?ram o espectro alimentar. A estrat?gia generalista foi utilizada pela maioria das esp?cies (19), contudo destas 15 esp?cies apresentaram tend?ncia ao especialismo por algum item. Aspistor luniscutis foi a esp?cie que apresentou maior diversidade de itens alimentares dentre as esp?cies estudadas e maior amplitude de nicho. Citharichthys spilopterus (diurno) e A. lineatus (noturno) foram as esp?cies que tiveram a atividade alimentar mais bem definida. As guildas dos consumidores de Copepoda e de Polychaeta foram as que apresentaram esp?cies com maior sobreposi??o tr?fica dentro do grupo, indicando plena disponibilidade dos recursos. N?o foram encontradas diferen?as significativas nas m?dias dos n?veis tr?ficos e de onivorias entre as zonas, esta??es do ano e classes de tamanho. A retirada de esp?cies da teia tr?fica modificou a conect?ncia, de acordo com o grau de intera??o desta esp?cie na teia. A separa??o em guildas tr?ficas no uso dos recursos alimentares e o uso de diferentes estrat?gias tr?ficas foram os mecanismos utilizados para coexist?ncia da ictiofauna na Ba?a de Sepetiba.

Orthopristis ruber (Cuvier, 1830) é uma espécie muito comum na costa brasileira, sendo encontrada em baias, onde figura entre os mais abundantes peixes nos arrastos de fundo. Este trabalho tem por objetivo avaliar a influência das condicionantes ambientais na distribuição espaço-temporal e no período reprodutivo de O. ruber na Baía de Sepetiba, uma área costeira semi-fechada no sul do Rio de Janeiro. Foi realizado um programa de arrasto de fundo, entre outubro de 1998 e setembro de 1999, em três zonas da baía, estabelecidas de acordo com sua proximidade do mar (interna, central e externa). Amostras mensais de peixes foram tomadas em triplicatas em cada ocasião de amostragem, bem como foram medidas as variáveis ambientais de temperatura, salinidade, transparência e profundidade. Abundância relativa foi avaliada com base nas CPUEs (Captura por Unidade de Esforço) em termos de número e de biomassa, enquanto o período reprodutivo foi determinado com o índice gonadossomático. Um total de 866 indivíduos foi capturado, com o tamanho variando entre 31 e 293 mm de comprimento total e proporção sexual de 1:1. Um maior número de peixes foi registrado em janeiro/fevereiro e em maio, embora não tenha sido encontrada diferença na abundancia relativa entre as estações do ano. Espacialmente, os maiores números e biomassas foram registrados na zona externa. Correlação positiva significativa foi encontrada entre a abundancia relativa e a profundidade, salinidade e transparência, e negativa com a temperatura. O período reprodutivo, indicado pelos maiores valores de índices gonadosomático (IGS), provavelmente ocorre de junho a setembro, coincidindo com as menores temperaturas. Esta espécie parece ter distribuição limitada às zonas mais externa da baia, próxima à influência com o mar, com maiores influxos no verão, como provável efeito da das Águas Centrais do Atlântico Sul (ACAS) que comprimem as Águas Costeiras (AC) para a baía. Orthopristis ruber (Cuvier, 1830) is a very common species in the Brazilian coast, being found in large abundance in bays where they rank among the most numerical abundant species in bottom trawls. This work aims to assess environmental influences on spatial, temporal distribution and reproductive period of O. ruber in the Sepetiba Bay, a coastal semi-closed area in the Rio de Janeiro State. Monthly samplings were carried out using otter trawl from October 1998 to September 1999, in three Bay zones, defined according to the proximity of the sea (inner, middle and outer). Samples were taken as triplicate at each site as well as environmental measurements of water temperature, salinity, transparency and depth. Relative abundance was assessed by CPUE (capture per unit effort) in both number and weight. The reproductive period was determined by the gonadossomatic index. A total of 866 individuals was caught, with size ranging from 31 to 293 mm Total Length and sex ratio 1:1. Higher fish numbers and biomass were recorded in January/February and May, although no significant difference was found among seasons. Spatially, the highest number and biomass were recorded in the outer zone. Positive significant correlation between relative abundance and depth, salinity and transparency and negative with temperature were found. The reproductive period, indicated by the highest gonadosomatic index (IGS) occurred probably between June and September, coinciding with the lowest temperatures. This species seems to have distribution limited to outer bay zones, near to the sea influence, with the highest influxes in Summer, as a probable effect of the South Atlantic Central Waters (SACW) that compress Coastal Waters (CW) toward the bay.

Foi investigada a dieta de Pachyurus bonariensis Steindachner, 1879 associando-a à variações espaciais, temporais e ontogenéticas. Os peixes foram coletados mensalmente de março/2000 a fevereiro/2001 e de agosto/2002 a fevereiro/2003 em duas baías do Pantanal, Chacororé e Sinhá Mariana. Conteúdos estomacais de 359 exemplares foram analisados através dos métodos de freqüência de ocorrência e volumétrico. A dieta foi composta essencialmente por larvas bentônicas de Chironomidae e Ephemeroptera, independente do local e período (seca e cheia) analisados. Entretanto, nota-se marcante diferença na composição alimentar de acordo com o tamanho do peixe. Os menores exemplares (comprimento padrão = 1,6 a 7,2 cm) consumiram preferencialmente Chironomidae e os maiores (comprimento padrão = 13,0 a 18,6 cm) Ephemeroptera. Conclui-se que P. bonariensis tem hábito alimentar bentívoro e especializado, devido principalmente ao restrito espectro alimentar aliado à posição e forma da boca adaptada a explorar o substrato. Spatial, temporal and ontogenetic variations in the diet of Pachyurus bonariensis Steindachner, 1879 were analyzed. Fishes were taken monthly from March 2000 to February 2001 and from August 2002 to February 2003 in the Chacororé and Sinhá Mariana bays. Diet was determined analyzing 359 stomach contents. To express diet results, were used occurrence and volumetric methods. The individuals consumed expressive amount of Chironomidae and Ephemeroptera larvae, in both bays and periods (dry and wet). Ontogenetic analysis showed that small individuals (Standard length = 1.6 to 7.2 cm) ate mainly Chironomidae, whereas larger ones (Standard length = 13.0 to 18.6 cm) consumed mainly Ephemeroptera. Then it is possible to infer that P. bonariensis is benthic-feeding fish with specialized diet. This characteristic was attributed because its narrow niche breadth allied with position and form of its mouth adapted to feed on the bottom.

Made available in DSpace on 2016-04-26T19:09:28Z (GMT). No. of bitstreams: 1 2006-Andre Luiz Machado Pessanha.pdf: 1312887 bytes, checksum: a59600a25f8c65e7634cbdec2c32a3a6 (MD5) Previous issue date: 2006-03-30 Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) The aim of this study was to determine spatial, seasonal and ontogenetic changes in diet of three abundant fishes species (Eucinostomus argenteus, Diapterus rhombeus and Micropogonias furnieri) which use the Sepetiba Bay as recruitment and rearing grounds, to test the hypothesis that they would be using the variation along the trophic axis as strategy to coexist. Two fishing sampling programmes were carried out during the day and night period: one by using beach seine to catch juveniles in two different locales of the bay, Itacuru?? beach located in the outer zone, and Sepetiba beach, located in the inner zone; and the other by using bottom trawls to catch subadults/adults in three bay zones (inner, middle and outer), defined according to environmental gradient (temperature, salinity, depth and transparency) of sea proximity. A total of 2075 stomachs were analyzed, being 769 E. argenteus (489 juveniles and 280 adults), 537 D. rhombeus (250 juveniles and 287 adults) and 769 M. furnieri (483 juveniles and 286 adults). Variations in the diet along the spatial axis were detected, reflecting the use of the available items in each areas. It the sandy beaches, where recruitment take places, juveniles uses mainly items from zooplankton, while in deeper bay areas, subadults/adults use items associated to substrate. E. argenteus juveniles showed as main preys Apendicularia, Calanoida, Tanaidacea and Polychaeta, while subadults/adults, Polychaeta, Harpacticoida and Caprella. D. rhombeus juveniles use mainly Tanaidacea, Apendicularia, Cyclopoida and Calanoida, while for subadults/adults Harpacticoida was the most important item. M. furnieri juveniles, catched in Sepetiba becah only, showed a diet basically comprised by two principal items, Cyclopoida and Polychaeta, while subadults/adults showed Polychaeta sp. 1, Polychaeta, Harpacticoida and Caprella. Ontogenetics changes in diet were evidenced for M. furnieri only, with individuals of size

Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico The aim of this work was to describe the trophic ecology of the five most abundant flatfishes species (Actinopterygii, Pleuronectiformes) in the Sepetiba Bay: Achirus lineatus, Trinectes paulistanus, Citharichthys spilopterus, Etropus crossotus and Symphurus tessellatus. Patterns of distribution were determined, and the feeding habits and resources partitioning were described along the spatial, temporal and size changes, aiming to assess the mechanisms and strategies used by the group to coexist in this sysgem. The study area was divided in three zones (inner, central e outer) according to environmental gradient of sea proximity previously described. Bottom trawls sampling were carried out monthly during the day, between October 1998 and September 1999 (1? cycle), and at each season, during the day and the night, between the Winter 2000 and the Autumn 2001 (2? cycle). Fishes were measured (mm), weighted (g) and dissected for removing the guts. Stomach contents were analyzed by using light and stereoscopy microscopy, and the feeding items were identified to the lowest possible taxonomic level. Achirus lineatus and Trinectes paulistanus were more abundant in the inner Bay zone, showing specialist behavior, preying on Polychaeta, with the former species showing activity during the day. Citharichthys spilopterus was widely distributed in the Sepetiba bay, showing generalist behaviour preying on Crustacea (Mysida) and Teleostei. Etropus crossotus and Symphurus tessellatus distributed in higher abundance in the outer zone and showed generalist behavior, using mainly Crustacea (Amphipoda); evidence of activity during the day were detect for the first species only. Size changes were detected for A. lineatus, T. paulistanus and S. tessellatus that used higher diversity of items when they reach larger sizes, while C. spilopterus and E. crossotus used larger sized items. Spatial partitioning in the use of the available resources was the strategy more widely used by Pleuronectiformes as mechanism to coexist in Sepetiba Bay. Ojetivo deste estudo foi descrever a ecologia tr?fica das cinco esp?cies mais abundantes de linguados (Actinopterygii, Pleuronectiformes) na Ba?a de Sepetiba: Achirus lineatus, Trinectes paulistanus, Citharichthys spilopterus, Etropus crossotus e Symphurus tessellatus. Foram determinados os padr?es de distribui??o, bem como descritos os h?bitos alimentares e parti??o de recursos ao longo das varia??es espa?o-temporais e por tamanho, visando determinar os mecanismos e estrat?gia usados pelo grupo para coexistir neste sistema. A ?rea de estudo foi dividida em tr?s zonas (interna, central e externa) de acordo com o gradiente ambiental previamente descrito. Amostragens de arrasto de fundo diurnos foram realizadas mensalmente, no per?odo entre outubro de 1998 a setembro de 1999 (1? ciclo), e nos per?odos diurno e noturno, trimestralmente, entre o inverno de 2000 e o outono de 2001 (2? ciclo). Os peixes foram medidos (mm), pesados (g) e dissecados em laborat?rio para a retirada do est?mago. Os conte?dos estomacais foram analisados sob microsc?pio estereosc?pio e/ou ?ptico, e os itens alimentares identificados ao n?vel taxon?mico mais inferior poss?vel. Achirus lineatus e Trinectes paulistanus foram mais abundantes na zona interna da Ba?a, apresentando um comportamento especialista voltado para o item Polychaeta, com a primeira esp?cie apresentando h?bitos diurnos. Citharichthys spilopterus foi uma esp?cie amplamente distribu?da na Ba?a de Sepetiba, apresentando um comportamento generalista voltado para itens das categorias Crustacea (Mysida) e Teleostei. Etropus crossotus e Symphurus tessellatus distribu?ram-se em maior abund?ncia na zona externa e apresentaram comportamento generalista, usando principalmente itens da categoria Crustacea (Amphipoda); evid?ncias de h?bitos diurnos foram detectados para a primeira esp?cie. Varia??es por tamanho foram detectadas para as esp?cies com A. lineatus, T. paulistanus e S. tessellatus utilizando uma maior diversidade de itens com o crescimento, enquanto C. spilopterus e E. crossotus utilizaram itens relativamente maiores. A separa??o espacial no uso dos recursos alimentares foi a estrat?gia mais utilizada pelos Pleuronectiformes como mecanismo de coexist?ncia na Ba?a de Sepetiba.

O objetivo deste estudo foi determinar as mudanças espaciais e ontogenéticas na dieta dos linguados Citharichthys spilopterus Günther, 1862 e Symphurus tessellatus (Quoy & Gaimard, 1824) na Baía de Sepetiba. A área de estudos foi dividida em três zonas (interna, central e externa), onde foram realizados arrastos de fundo diurnos no período entre outubro/1998 a setembro/1999. C. spilopterus apresentou os maiores Índices de Importância Relativa (IIR) para Mysidacea (0.3359) e Amphipoda (0.0805), enquanto S. tessellatus apresentou maiores IIR para Amphipoda (0.7515) e Polychaeta (0.2586). A elevada porcentagem (67,61%) de estômagos vazios em S. tessellatus sugere atividade alimentar noturna. Os espécimes de menor tamanho (CT < 115 mm) de C. spilopterus alimentaram-se de Mysi-dacea na três zonas e os maiores (CT > 115 mm) de Polychaeta na zona interna, Gobiidae na central e Decapoda na externa. Os menores espécimes (CT < 155 mm) de S. tessellatus alimentaram-se principalmente de Amphipoda e os maiores (CT > 155 mm) de Polychaeta na zona interna, e de Amphipoda e Polychaeta na zona externa. Citharichthys spilopterus apresentou maior tamanho de boca e olho, e se alimentou de organismos associados à coluna da água próxima, tendendo a uma dieta mais especialista quando comparado com S. tessellatus que se alimentou de organismos sobre fundo. Apesar das duas espécies terem se alimentado basicamente de Crustacea, apresentaram baixa sobreposição alimentar com 0,1972, provavelmente podendo ser esta a estratégia de separação trófica desenvolvida para permitir a coexistência destas duas espécies relacionadas na Baía. The aim of this study was to assess the spatial and ontogenetic changes in diet of the flatfishes Citharichthys spilopterus Günther, 1862 and Symphurus tessellatus (Quoy & Gaimard, 1824) in the Sepetiba Bay. The studied area was divided in three zones (inner, central e outer), where bottom trawls were performed during the day, from October 1998 to September 1999. Citharichthys spilopterus showed higher Indices of Relative Importance (IRI) for Mysidacea (0.3359) and Amphipoda (0.0805), while S. tessellatus showed the highest IRI for Amphipoda (0.7515) and Polychaeta (0.2586). The high percentage (67.61%) of empty guts in S. tessellatus suggests nocturnal feeding activity. Smaller sized individuals (TL < 115 mm) of C. spilopterus fed on Mysidacea in the three bay zones, while the larger sized (TL > 115 mm) fed on Polychaeta the inner zone, Gobiidae in the central and Decapoda in the outer. The smaller individuals (TL < 155 mm) of S. tessellatus fed mainly on Amphipoda while the largest (TL > 155 mm) fed on Polychaeta in the inner zone, and Amphipoda and Polychaeta in the outer zone. Citharichthys spilopterus, shows comparatively larger mouth and eye, and feed on organisms in the water column nearby, with a more specialized feeding habit, compared with S. tessellatus, which feed on organism on the substrate. Although the two species feed basically on Crustacea, they present low overlaping in the diet (0.197), and this is probably the trophic strategy developed to allow the coexistence of these two closely related species in the Bay.

A relação peso-comprimento de Orthopristis ruber (Cuvier, 1830) na Baia de Sepetiba (22º54'-23º04'S; 43º34'-44º10'W), Rio de Janeiro foi determinada. Este trabalho objetiva contribuir com o conhecimento sobre a morfometria desta espécie na baía e fornecer bases para comparações com outros ambientes. Os peixes foram coletados em programas de amostragens de arrasto de praia (juvenis) e arrasto de fundo (adultos) entre outubro de 1998 e setembro de 1999. A equação encontrada foi W = 0,000006 L3,1368 para machos e W = 0,000006 L3,14º3 para fêmeas. Alometria positiva foi encontrada para machos e fêmeas e a proporção sexual foi de 1:1. Os altos valores para o coeficiente alométrico indicam alto investimento no crescimento, que pode ser devido ao pequeno tamanho relativo dos espécimes da população analisada, ou ser um mecanismo para suportar as condições de estresse nesta área. The lenght-weight relationship of Orthopristis rubber (Cuvier, 1830) in the Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W), Rio de Janeiro was determined. It aims to contribute to morphometrics knowledge of this species in a semi-closed coastal area and to supply basis for comparisons with others environment. Fishes were collected by beach seine (juveniles) and otter trawl (adults) from October 1998 to September 1999. The equation found was W = 0,000006 L3,1368 for males and W = 0,000006 L3,14º3 for females. Positive allometry was found for both sexes and sex rate was 1:1. The comparatively high values for allometric coefficient indicate high investment in growth, which can be due to relatively small size of the examined fish populations, or a mechanism to overcome stress conditions in the area.

The white croaker Micropogonias fumieri (Desmarest, 1823) is one of the most abundant fish species in the Sepetiba Bay, being heavily exploited in fisheries. Two hundred eleven fishes, captured from October 1998 to September 1999, in monthly samplings with otter trawling, were studied. The aim here is to characterize morphometrics of populations that use de Bay in order to compare with other areas. Measurements included standard length (SL), head length (HL), Pre-dorsal distance (PDD), pectoral distance (PD), ventral distance (VD) and anal distance (AD), pectoral length (PL) and eye diarneter (ED). The values of HL, PDD, PD, VD, AD, were related to SL, while ED was related to HL. Scatterplot from logaritrnized data, by sex, were analyzed in order to assess alometry. Males outnumber females with differences being highly significant (p < 0.01), mainly in size c1ass 100 and 150 mm SL. The studied population varying from 62 to 205 mm. Head length varied from 28.7 to 38.6% SL; PDD 32.5 to 42.9%; PD 276 to 41.1 %; VD 26.6 to 44.8%; AD 58.1 to 76.8%; and PL 10.8 to 29.8%. Eye diameter varied from 16.7 to 26.1 % HL. Positive alometry (k > I) were shown for PL in both sexes, and for AD in female, indicating that these measurements increase proportionately more than the standard length; isometric growth (k = 1) were shown for HL, PDD, PD, VD in both sexes, for AD in males; negative alometry (k < 1) was shown only for ED in relation to head length (HL), in both males and females. The white croaker populations in lhe Sepetiba Bay seems to be similar in their morphometrics aspects to the populations of coastal zone at Southeast Brazil, which differ from South coastal zone populations.

The length-weight relationship of populations of white croaker Micropogonias furnieri (Desmarest, 1823) in the Sepetiba Bay (22o54'-23o04'S; 43o34'-44o10'W), were assessed. It aims to contribute to the knowledge of the biometrics and to estimate the biomass of this very abundant fishery resource in the Bay. Fishes sampled, in both trawling beach seine, sampling programme, from October 1998 to May 1999 were analyzed. The equation found was W = 0.00000942 L2.99 fom the natural logaritmized transformation of the raw data, through ordinary least square equation = In W = -11.57 + 2.996 In L (r=0.99). The condition factor was relatively high compared with coastal population from Southeast Brazil, probably due to in this study both males and females from juvenile and adult were considered, while in coastal areas, only adult female were analyzed. The alometry coefficient (θ), on the other hand, is very similar to the coastal Southeast Brazil population, but differed from Northeast and South Brazil populations.