Ocean Research Articles

Post Independence Development of Fisheries in Sri Lanka

The Island Sri Lanka has a coast line of about 1640 km. she is ideally located in the Indian Ocean to harvest thefish stocks all the Imy to Antarctic and be one ofthe leadingfishing nations of the world. However. the reality is quite opposite to the above assumption. Her fish production was about 10.000 mt until middle of 20th century, around 1948: harvested, primarily using very primitivefishing gear made out of coir; cotton and hemp, Out of the above total catch. about 47 percent was by beach seine (madel). one of the sluggish and inefficient method offishing in the word Fish has to approach the gear instead of gear chasing after the fish. Further. the fisherman ventured into the sea to operate their primitive fishing gear in dug out canoes, wooden plank rafts or vaded out into sea up to chest height. These were traditional fishing crafts and operated in the continental shelf waters up to a distance of about 10-12 kmfrom shore. The change in the gearfrom coir nets and ropes to nylon nets and lines commenced around I958, amidst resistance from other fisherman due to their inability to absorb new technology. Infact fishermen even destroyed nylon nets by dynamiting them, at the same time, traditional log rafts and dug out canoes were fitted with out board motors to increase the efficiency ofcrafts. There were 104 such mechanized crafts in 1958 and 861 in 1963. This led to increase fish catch from 25.2 mt in 1952 to 91.2 mt in 1963 an increase of 10,000 mt/year. Subsequently, in mid 1960s more 3 1/toners, 40 of 11 toners were added on to the fleet; the latter were owned and operated by Ceylon Fisheries Corporation. Further 07 trawlers to operate in Wadge Bankfrom Colombo and tuna clippers to operate in the Oceanic waters were introduced Research and technology got underwayfunded by Colombo Planfrom mid 1950s; that was a turning point in most development of our fishing industry. Titus, the Colombo Plan was the sheet anchor of post independent fisheries research in Sri Lanka The work of Medcoff and Sivalingam brought a wealth of research information on fish resource. These later paved the wayfor the introduction of multidayfishing boats withfreezing facilities. Universities. namely. Vidyodaya started to teachfisheries science in 1966 under the leadership of Dr K. Sivasubraniam. followed by other Universities to provide scientific manpower for research and management. Then hy 1972 our total fish production was about 93.000mt. Around 1970s beach landing Fiber Reinforced Plastic Boats (FRP Boots due to plastic industry and shortage of timber) entered the industry and became very popular. The total fish production was about 179.000 mt around 1979. The declaration of the 200 nautical mile Exclusive Economic Zone (EEZ) in /976. with an area of 517.000 km helped to increase the fish product ionfurther. although, Sri Lanka lost Wedge Bank and northern half 0f Pedro Bank to India. 1n mid 1980s Government owned trawlers were disposed of as the fishery was unprofitable. More fish resource surveys were undertaken by R/V Dr. Fridtjof Nonsen (1970s and 1980s) and other surveys by NARA and the Universities. This led to expansion of thefishing industry. A great leap in the offshore with multiday boats development took place at the end of 1970. The offshore fishery. mostly for large pelagic species like tuna. sharks. and hill fish like marlins. swordfish and sailfish rose sharply after 1993 to 70 mt/boot/year by 2007 and its rising Its development initiated around 1960s with the introduction oftuna long liners in the Oceanic waters. By then the coastal fishery for small pelagic species had started to decline due /0 huge increase in effort, thus, its cpue is now dropping below 5mt/boat/year. The demersal fishery seems to be still in dormant stage due to lack of information on the species and stocks. Therefore, thefuture of the coastal fishing industry in the future could lie on coastal demersal species and offshore fishery that started to develop after independence.

Generation of 100-year-return value maps of maximum significant wave heights with automated threshold value estimation

Spectral numerical wave models are unable to predict extreme sea conditions accurately, and the probability of occurrence of a given wave parameter for fixed return periods (RPs) remains unexplored by such an approach. In this study, the significant wave height (SWH) parameter that plays a major role in ocean engineering and marine and naval activities was estimated spatially for the entire Bay of Bengal (BOB) region for the given RPs. Spatially gridded 44 years of SWH data at a spatial resolution of 1° × 1° were considered, and return value maps were generated for the BOB for 10-, 15-, 25-, 50-, and 100-year RPs. The peak over threshold (POT) model was chosen over a generalized Pareto distribution for data fitting and calculating the return values. As there is no existing method to determine the threshold value for use in the POT model, in this study, for the first time, an algorithm was designed to calculate the threshold value, which determined the accuracy of the estimation. Along with the conventional time-series analysis of the SWH data using POT, the novelty of the study lies in the spatial return period maps generated for the entire BOB region leading to the basin scale estimation.

Ancient Ocean Crossings: Reconsidering the Case for Contacts with the Pre-Columbian Americas; World Trade and Biological Exchanges Before 1492, Revised and Expanded Edition; Pre-Columbian Sailors Changed World History

Stephen C. Jett. Tuscaloosa, AL: The University of Alabama Press, 2017. xvii and 508 pp., maps, diagrams, drawings, notes, references, index. $49.95 cloth (ISBN 978-0-8173-1939-7).John L. Sorenson ...

Oral and otolaryngological complications of radiotherapy for head and neck cancers among patients attending Ocean Road Cancer Institute, Tanzania

Background The prevalence of head and neck cancers is on the increase worldwide. Treatment modalities include surgery, radiotherapy and chemotherapy. The aim of this study was to determine the proportion of acute oral and otolaryngological complications of radiotherapy with or without chemotherapy for head and neck cancers. Methods A retrospective cross-sectional, hospital based study was done to 80 patients with head and neck cancers who have just completed radiotherapy with or without chemotherapy at Ocean Road Cancer Institute (ORCI). Data was collected using a structured questionnaire within one week after completion of radiotherapy. Patients who reported hearing loss underwent otoscopy and audio-logical assessment including tympanometry and pure tone audiometry. Data was analyzed using SPSS program. Results The proportion of males was higher than that of females in the ratio of 2:1 and majority of the patients involved were in the 6th decade of life, (27.5%). Out of the 80 study participants, 80% were found to have oropharyngeal mucositis, 90% were found to have xerostomia and 50% were found to have dysphagia. In addition, 76.2% of patients reported to have developed taste disorders after radiotherapy and 43.1% reported to have developed voice disorders. The proportion of hearing loss following radiotherapy was 21.9% though this should be taken with caution since there was no before and after intervention taken. Patients with sinonasal cancers had the least proportion of oral and oropharyngeal mucositis (50%), xerostomia (64.3%) and voice disorders (14.3%). Most of patients who developed hearing loss had nasopharyngeal cancer (85.6%) and salivary gland cancer (66.7%) while patients with oropharyngeal cancer, hypopharyngeal cancer and laryngeal cancer did not develop hearing loss at all. Conclusion Oral and otolaryngological complications of radiotherapy with or without chemotherapy for head and neck cancers at ORCI are quite prevalent. Prevention of complications should be highly regarded especially by using shield protectors on uninvolved areas and advanced radiotherapy machines should be considered to minimize such complications. Key words: Oral, otolaryngological, head, neck, cancers, Tanzania.

Regular Super-resolution Restoration Algorithm Based on Fuzzy Similarity Fusion for a Single Haze Image over the Ocean

ABSTRACT Xu, L. and Xu, X., 2019. Regular super-resolution restoration algorithm based on fuzzy similarity fusion for a single haze image over the ocean. In: Guido-Aldana, P.A. and Mulahasan, S. (e...

Information Hiding Algorithm of Low-Density 3D Model for Multi-fusion Ocean Applications

ABSTRACT Duan, T.; Zhang, J., and Zhao, J., 2019. Information hiding algorithm of low-density 3D model for multi-fusion ocean applications. In: Gong, D.; Zhu, H., and Liu, R. (eds.), Selected Topic...

Analysis of influencing factors of recurrent spontaneous pneumothorax in adolescents after closed thoracic drainage

Objective To explore the influencing factors of recurrent spontaneous pneumothorax after thoracic closed drainage in adolescents. Methods From January 2010 to May 2018, 62 young patients with spontaneous pneumothorax treated in School Hospital of Zhejiang Ocean University and referral to superior hospital were selected.The patients were followed up by telephone or clinic for 24 months after discharge, and their general information and recurrence were collected.Logistic regression multivariate analysis was used to investigate the influencing factors of recurrent spontaneous pneumothorax after thoracic closed drainage in adolescents. Results Sixty-two patients were followed up, 15 patients with recurrence, and the recurrence rate was 24.19%.Univariate analysis showed that age over 20[recurrence and non-recurrence ≤20 years old 11 cases (73.33%), 11 cases (23.40%); >20 years old 4 cases (26.67%), 36 cases (76.59%)], body mass over 19.6kg/m2[recurrence and non-recurrence BMI ≤19.6 10 cases (66.67%), 18 cases (38.30%); BMI>19.6 5 cases (33.33%), 29 cases (61.70%)], smoking[recurrence and non-recurrence smoking 12 cases (80.00%), 14 cases (29.79%); non-smoking 3 cases (20.00%), 33 cases (70.21%)], degree of pneumobula lesions[recurrence and non-recurrence mildly 3 cases (20.00%), 19 cases (40.43%); medium 5 cases (33.33%), 20 cases (42.55%); severe 7 cases (46.67%), 8 cases (17.02%)], pneumothorax[recurrence and non-recurrence a little 2 cases (13.33%), 20 cases (46.81%); massive 13 cases (86.67%), 27 cases (53.19%)] and diameter of pneumobula over 1cm[recurrence and non-recurrence ≤1cm 5 cases (33.33%), 28 cases (61.70%); >1cm 10 cases (66.67%), 18 cases (38.29%)] were associated with recurrence after closed thoracic drainage (χ2=11.857, 5.192, 9.325, 13.522, 9.824, 6.823, all P<0.05). The results of logistic multivariate regression analysis showed that age(OR: 1.224; 95% CI: 0.958-12.142), BMI(OR: 3.463; 95% CI: 0.824-9.024), smoking(OR: 5.000; 95% CI: 1.534-9.852), degree of pneumobulus lesions(OR: 12.041; 95% CI: 6.032-12.174) and pneumothorax(OR: 2.465; 95% CI: 1.627-4.684) were the influencing factors for recurrence after primary spontaneous pneumothorax drainage in adolescents (all P<0.05). Conclusion Younger than 20 years of age, smoking, pneumobulous lesions and large pneumothorax are risk factors for recurrence after primary spontaneous pneumothorax drainage. Key words: Teenagers; Pneumothorax; Closed drainage of thoracic cavity; Recurrence; Logistic models; Factor analysis, statistical

Ocean fizz could have helped to kick-start life

Ocean fizz could have helped to kick-start life

Lithostratigraphy and petrography of the Monte Banchetta-Punta Rognosa oceanic succession (Troncea and Chisonetto Valleys, Western Alps)

This paper describes lithostratigraphy and Alpine tectono-metamorphic evolution of the oceanic succession of the Monte Banchetta-Punta Rognosa unit (Italian Western Alps). The oceanic substratum consists of serpentinized peridotites covered by ophicarbonates, documenting therefore exhumation and exposure of the upper mantle at the seafloor in Jurassic times. Upwards, the sedimentary cover begins with polymictic metabreccias and intercalated siliciclastic sediments (considered Late Jurassic - Early Cretaceous in age), both containing oceanic and continental detritus, and interpreted as mass-flow deposits on sea floor. Then, the upper part of the cover consists of Cretaceous pelagic carbonate sediments (calcschists), lying over a main unconformity. The stratigraphic features and the architecture of the sedimentary cover suggest that this segment of the Piemonte-Liguria Ocean was in a proximal position with respect to the rifted margins. In a general context of the ocean-continent transition, source areas for continental detritus can be envisaged on the hyperextended part of the European margin or on its more proximal part, adjacent to structural highs made of oceanic mantle, as recorded by oceanic detritus. The combination of structural,petrographic and mineral chemistry data defined the Alpine prograde and retrograde metamorphic evolution of this oceanic segment. The metamorphic peak was reached during the D1 event at the transition between lawsonite- and epidote- blueschist facies conditions. Then, a first decompressional event D2 always at blueschist facies conditions was followed by a D3 event at green schist facies conditions.

Mapping the progressive geologic history at the junction of the Alpine Mountain Belt and the Western Mediterranean Ocean

This contribution illustrates a new type of map, the “geological event map” (1:250,000 scale), which highlights the progressive steps of the geologic history recorded in the polycyclic orogenic belt of the European Alps, at their southwestern termination facing the western Mediterranean Sea. The formula of historical progression simplifies comprehension of significant phenomenal visions and reorients public curiosity towards geologic processes. This part of the Alpine belt records a geologic history starting with the Variscan convergence during Devonian, throughout the opening of the Tethys Ocean, Alpine convergence, followed by Apennine subduction driving the opening of the Ligurian-Provencal Ocean. Finally, from late Miocene to Present a progressive tectonic inversion characterizes the Ligurian-Provencal continental margin. This geologic history, over a time period of 400 million years, which includes three successive Wilson Cycles, is displayed in 8 plates composed of maps and illustrations. Each map explains the effects of successive tectonic events by adding geologic changes that modify the petrogenetic and structural configurations. The last plate shows the finite state of the geologic history at present-time. The map legend is based on ten major geodynamic events of which rock associations, and their genetic environment, are described in simple divulgation terms, to stimulate interest of neophytes. Illustration of the evolution of rocks and structures side of each map aims at conveying to non specialists in tectonics and petrology the impact of mechanisms associated with the Earth’s deep engine upon surface changes.

Sustainable Potential of Tuna Fishery Around the Waters of North Sulawesi Province Based on Data from the Bitung Ocean Fisheries Port (PPS)

This research was conducted in the city of Bitung, North Sulawesi Province with activities centered on the Bitung Ocean Fisheries Port (PPS), which began from mid March to April 2019. The fishing activities studied are using the fishing areas around the waters of North Sulawesi Province namely the Sulawesi Sea and The Maluku Sea which are included in WPP 715 and 716 based on tuna catch landed data on PPS Bitung. The purpose of this study was to analyze the value of sustainable potential by looking at the level of utilization and Maximum Sustainable Yield (MSY) of tuna in the waters around North Sulawesi Province based on a surplus production model approach (Schaefer Model). This research is expected to be used as a consideration in the management of tuna stocks around the waters of North Sulawesi Province, and can be used as a basis for further research. This study uses a secondary data collection method in the form of fishery statistics documents. The data used are data from tuna fishing and fishing (effort), from 2014 to 2018 (5 years). The results showed that the sustainable potential of tuna fisheries around the waters of North Sulawesi Province based on North Sulawesi PPS data indicated that, the sustainable potential value of tuna that could be caught was 14,173.51 tons / year which is counted as 80% of the value of tuna resources around the waters of North Sulawesi Province. PPS Bitung data which amounted to 17,716.15 tons / year for Hmsy, 1,200.15 trips / year for Emsy, with an average CPUE value of 2014-2018 of 19 tons / trip. The level of tuna utilization around the waters of North Sulawesi Province is based on data from PPS Bitung in 2014, 2017 and 2018 which indicate that there were indications of overfishing with the largest utilization rate in 2014 which reached a value of 155.09%.Keywords: tuna, Bitung, Bitung PPS, sustainable potential, MSY. ABSTRAKKegiatan penelitian ini berlangsung di Kota Bitung, Provinsi Sulawesi Utara dengan kegiatan berpusat di Pelabuhan Perikanan Samudera (PPS) Bitung, yang dimulai dari pertengahan bulan Maret hingga bulan April 2019. Aktivitas perikanan tangkap yang ditelaah berlangsung di sekitar perairan Provinsi Sulawesi Utara yaitu Laut Sulawesi dan Laut Maluku yang masuk ke dalam WPP 715 dan 716 berdasarkan data tangkapan tuna yang didaratkan di PPS Bitung. Tujuan dari penelitian ini adalah untuk menganalisis nilai potensi lestari dengan melihat tingkat pemanfaatan dan maximum sustainable yield (MSY) ikan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan pendekatan model produksi surplus (Model Schaefer). Penelitan ini diharapkan dapat digunakan sebagai bahan pertimbangan dalam pengelolaan stok ikan tuna di sekitar perairan Provinsi Sulawesi Utara, serta dapat digunakan sebagai dasar untuk penelitian selanjutnya. Penelitian ini menggunakan metode pengumpulan data sekunder berbentuk dokumen. Data yang diambil adalah data tangkapan ikan tuna dan upaya penangkapan ikan atau effort (trip), dari tahun 2014 sampai dengan 2018 (5 Tahun). Hasil penelitian menunjukkan potensi lestari perikanan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung Sulawesi Utara nilai potensi lestari tuna yang bisa ditangkap adalah 14.173,51 ton/tahun 80% dari nilai pemanfaatan sumber daya perikanan tangkap tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung yang sebesar 17.716,15 ton/tahun untuk Hmsy, 1.200,15 trip/tahun untuk Emsy, dengan nilai CPUE rata-rata tahun 2014-2018 sebesar 19 ton/trip. Tingkat pemanfaatan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung Sulawesi Utara di tahun 2014,2017 dan 2018 sudah yang menandakan adanya indikasi overfishing dengan tingkat pemanfaatan terbesar di tahun 2014 yang mencapai nilai 155,09%.Kata Kunci: ikan tuna, Bitung, PPS Bitung, potensi lestari, MSY.

A comparative analysis of the Ocean Health Index and the Pressure-State-Response evaluation methods for Shanghai's ocean ecosystem health

A comparative analysis of the Ocean Health Index and the Pressure-State-Response evaluation methods for Shanghai's ocean ecosystem health

Understanding Iodine Chemistry Over the Northern and Equatorial Indian Ocean

AbstractObservations of halogen oxides, ozone, meteorological parameters, and physical and biogeochemical water column measurements were made in the Indian Ocean and its marine boundary layer as a part of the Second International Indian Ocean Expedition (IIOE‐2). The expedition took place on board the oceanographic research vessel Sagar Nidhi during 4–22 December 2015 from Goa, India, to Port Louis, Mauritius. Observations of mixed layer depth, averaged temperature, salinity, and nitrate concentrations were used to calculate predicted iodide concentrations in the seawater. The inorganic iodine ocean‐atmosphere flux (hypoiodous acid [HOI] and molecular iodine [I2]) was computed using the predicted iodide concentrations, measured atmospheric ozone, and wind speed. Iodine oxide (IO) mixing ratios peaked at 0.47 ± 0.29 pptv (parts per trillion by volume) in the remote open ocean environment. The estimated iodide concentrations and HOI and I2 fluxes peaked at 200/500 nM, 410/680 nmol·m−2·day−1, and 20/80 nmol·m−2·day−1, respectively, depending on the parameterization used. The calculated fluxes for HOI and I2 were higher closer to the Indian subcontinent; however, atmospheric IO was only observed above the detection limit in the remote open ocean environment. We use NO2 observations to show that titration of IO by NO2 is the main reason for this result. These observations show that inorganic iodine fluxes and atmospheric IO show similar trends in the Indian Ocean marine boundary layer, but the impact of inorganic iodine emissions on iodine chemistry is buffered in elevated NOx environments, even though the estimated oceanic iodine fluxes are higher.

Development characteristics of reefs on the platform margin of Changxing Formation in eastern Kaijiang-Liangping ocean trough and its significance for petroleum geological exploration

Development characteristics of reefs on the platform margin of Changxing Formation in eastern Kaijiang-Liangping ocean trough and its significance for petroleum geological exploration

Regional Ocean Model Parallel Optimization in “Sunway TaihuLight”

Regional Ocean Model Parallel Optimization in “Sunway TaihuLight”

Resurrection of Gelasimus variegatus Heller, 1862, A Fiddler Crab Closely Related to Austruca bengali (Crane, 1975) and A. triangularis (A. Milne-Edwards, 1873) (Decapoda, Brachyura, Ocypodidae), from the Bay of Bengal, Indian Ocean.

The identity of the fiddler crab, Gelasimus variegatus Heller, 1862 (type locality: Madras, India), has long been uncertain. Examination of specimens from the Bay of Bengal shows that it is a valid species belonging to the genus Austruca Bott, 1973. Austruca variegata (Heller, 1862) can be separated from the closely related A. bengali (Crane, 1975) and A. triangularis (A. Milne-Edwards, 1873) by characters of the carapace, orbital floor, major and minor chelae, male first gonopod, vulva (female gonopore), gastric mill, and coloration in life. The three species are also supported by genetic data (nuclear 28S rDNA, mitochondrial 16S rDNA and cytochrome oxidase subunit I (COI)). Biogeographically, A. variegata is distributed in the Bay of Bengal and reaches to the Laccadive Sea; A. bengali is present in the Andaman Sea; and A. triangularis is widely distributed in the West Pacific.

Consideration of Improvement Plans about the Current Status and Problems of Administrative Disciplinary Action for the Ship Officers

Marine accidents and legal violations result from mistakes and negligences of ship officers, deck officers and engine officers, during the ship navigation and lay days. Due to these accidents and violations, these officers are subjected to disciplinary actions for certification. The disciplinary action, namely certificate punishment is carried out by right rules, processes and equity. However, it is revealed that present situations are different from the principles. For the purpose of finding current states relating to certificate punishment, this study examines and analyses 737 punishment cases, accomplished in ‘B’ regional office of oceans & fisheries for 5 years from 2014 to 2018. The contents to be analyzed are reprimand agencies, certificate kinds, officers ranks at that time, disciplinary level, violated acts, annual reprimand state, punishment rule and it process, and disciplinary reduction levels. From such valuations various problems, such as disciplinary level deviations among laws, insufficient punishments rules, disciplinary certificate deviation, insufficient reprimand reduction rules, and lack function of crew administrative disciplinary council, are identified. Finally, methods to alleviate the problems identified will be proposed. This study, for the first time analyses the actual administrative disciplinary cases for ship officers’certificates and proposes improvement plans for its incorporation in Korea, This analysis will be useful in the examination of the study for the ship officers and making a plan for them.

Delimitation of Tigertooth Croaker Otolithes Species (Teleostei: Sciaenidae) from the Western Arabian Gulf Using an Integrative Approach, with a Description of Otolithes arabicus sp. nov.

Two species, Otolithes ruber and Otolithes cuvieri, are currently recognized in the sciaenid genus Otolithes. Recent findings suggest that Otolithes ruber likely has multiple genetically and morphologically distinct lineages and one of them, Otolithes sp. West Indian Ocean II group (WIO II group), has been previously identified in the Arabian Gulf. In this study, the specimens of Otolithes sp. collected from the western Arabian Gulf were examined using an integrative approach by combining mitochondrial cytochrome c oxidase 1 gene, morphological characteristics, and otolith-shape analyses. Three groups were found to have small within-group and large between-group genetic distance: the Otolithes sp. Western Arabian Gulf (WA) group, and the Otolithes sp. WIO II groups type A and type B. Accordingly, three primary species hypotheses were proposed. Evidence from conventional morphological comparisons, multivariate statistical analysis, geometric morphometric landmark analysis on morphological characteristics, and otolith shape analysis based on wavelet transformation all favor the hypothesis that the Otolithes sp. WA group is a distinct lineage. For this new species, the name Otolithes arabicus sp. nov. is proposed. A detailed description of Otolithes arabicus sp. nov. and a key to identifing species in the genus Otolithes are also provided. However, the primary species hypotheses for Otolithes sp. West Indian Ocean II group type A and type B cannot be fully supported because of partial congruence, which may result from recent divergence.

Resurrection and Re-description of Pampus candidus (Cuvier), Silver Pomfret from the Northern Indian Ocean.

Pomfrets (Genus Pampus) are commercially important fish in the Indo-Pacific region. The systematics of this genus is complicated because of morphological similarities between species. The silver pomfret from Indian waters has long been considered to be Pampus argenteus. Morphological and molecular examination of specimens from the Arabian Sea and Bay of Bengal regions suggested the silver pomfret from the region represents two species that are distinct both from each other and from P. argenteus from the South China Sea. Based on detailed morphological, meristic and molecular examinations, the most common species from the Indian Ocean was found to correspond with the descriptions of Stromateus candidus (Cuvier), which is resurrected from the synonymy of P. argenteus and redescribed here as Pampus candidus (new combination). The second species, which has restricted distribution in Indian waters needs further studies to arrive at taxonomic conclusions and is hence not described in the current study. Lectotypes are also designated for Pampus candidus.

Circulação Oceânica a 1000 Metros na Região da Cadeia Vitória - Trindade

A circulacao oceânica de subsuperficie desempenha um papel crucial nos transportes oceânicos de calor e massa e consequentemente no sistema climatico terrestre. Algumas regioes oceânicas ate os dias atuais ainda apresentam poucos estudos que busquem caracterizar aspectos basicos relativos a dinâmica oceânica existente em niveis intermediarios e profundos, como e o caso de parte significativa da regiao oceânica adjacente a costa leste brasileira. Este trabalho tem como objetivo a caracterizacao da circulacao oceânica a 1000 metros e a estrutura termohalina na regiao da Cadeia Vitoria – Trindade (CVT) a partir de perfiladores lagrangeanos Argo. Os resultados indicam que a profundidade de 1000 metros e uma regiao de transicao na coluna d’agua entre a circulacao intermediaria e a profunda, sobretudo sob o ponto de vista da analise da trajetoria. Ao norte da cadeia, o fluxo e dominado por uma corrente de norte para sul, atribuido a Corrente de Contorno Profunda (CCP). Enquanto no sul da cadeia, um fluxo zonal de leste para oeste domina a regiao oceânica e a Corrente de Contorno Intermediaria (CCI) aparece junto ao talude indo para norte, enquanto um fluxo contrario para sul ocorre mais afastado da costa. Na analise termohalina da regiao, as caracteristicas termohalinas da Agua Intermediaria Antartica (AIA) dominam o nivel de 1000 metros, o que sugere que ao norte da cadeia a CCP influencie no transporte da AIA para sul.