scholarly journals DIET COMPOSITION OF PELAGIC FISH IN THE SOUTHWESTERN ATLANTIC, BRAZIL: AN ISOTOPIC MIXTURES APPROACH

2017 ◽  
Vol 50 (1) ◽  
pp. 132
Author(s):  
Guilherme Rossi Gorni ◽  
Maria Lúcia Ribeiro ◽  
Roberto Goitein ◽  
Alberto F. Amorim
Keyword(s):  
Diet Composition ◽  
Pelagic Fish ◽  
Thunnus Albacares ◽  
Southwestern Atlantic ◽  
Prionace Glauca ◽  
Isurus Oxyrinchus ◽  
Thunnus Obesus ◽  
Thunnus Alalunga ◽  
Xiphias Gladius

A proposta do presente trabalho é caracterizar, através de modelos de mistura isotópica (13C e 15N), a dieta de predadores de topo pelágicos do Oceano Atlântico Sudoeste. Para isso, amostras de tecido muscular foram coletadas dos seguintes peixes: Xiphias gladius, Thunnus obesus, Thunnus alalunga, Thunnus albacares, Prionace glauca, Alopias superciliosus e Isurus oxyrinchus. Os resultados indicam que a dieta de X. gladius é composta primariamente de cefalópodes (lulas Ommastrephidae). Um padrão similar é apresentado por T. alalunga, cuja dieta é também composta principalmente por lulas Ommastrephidae. T. albacares e T. obesus apresentam padrões similares de composição da dieta, ambas as espécies alimentam-se primariamente de pequenos peixes pelágicos. A. superciliosus compõe sua dieta principalmente de espécies de Scombridae (T. albacares e T. alalunga), diferentemente de P. glauca, cuja dieta é composta primariamente de peixes pelágicos de menor porte. O uso, de forma conjunta, das informações extraídas tanto do conteúdo estomacal dos predadores, quanto das análises isotópicas de seus tecidos, apresenta-se como um importante passo em direção ao completo entendimento da rede trófica pelágica do Oceano Atlântico Sudoeste.

scholarly journals KOMPOSISI JENIS DAN DISTRIBUSI UKURAN IKANPELAGIS BESAR HASILTANGKAPANPANCINGULURDI SENDANGBIRU, JAWATIMUR

2017 ◽  
Vol 3 (6) ◽  
pp. 377
Author(s):  
Ria Faizah ◽  
Aisayah Aisayah
Keyword(s):  
Species Composition ◽  
Size Distribution ◽  
Landing Site ◽  
Pelagic Fish ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Bigeye Tuna ◽  
Katsuwonus Pelamis ◽  
Individual Weight ◽  
Thunnus Obesus

Sendang Biru merupakan salah satu tempat pendaratan ikan pelagis besar di Jawa Timur. Penelitian tentang komposisi jenis dan ukuran ikan pelagis besar hasil tangkapan pancing ulur yang didaratkan di PPI Pondok Dadap, Sendang Biru, Jawa Timur, dilakukan pada bulanApril dan Oktober 2010. Hasil penelitian menunjukkan hasil tangkapan pancing ulur didominasi oleh jenis tuna (Thunnus albacares dan Thunnus obesus) 45%, cakalang (Katsuwonus pelamis) sebesar 38 %, dan lainnya (marlin, lemadang, lauro) sebesar 1,7 %. Ikan tuna yang didaratkan terdiri dari jenis yellowfin tuna (Thunnus albacares) dan bigeye tuna (T. obesus) dengan ukuran panjang cagakmasing –masing berkisar antara 40 - 170 cmFL dan 40 - 140 cmFL. Berat individumasing-masing berkisar antara 0.1 - 71 kg dan 0.5 - 43 kg. Sendang Biru is one of big pelagic’s landing site in East Java. Tuna on this research are caught by handline that landing in PPI Pondok Dadap, Sendang Biru, East Java. Research on the species composition and size distribution of big pelagic fish caught by handline were carried out during April and October 2010 at Sendang Biru, East Java. The result showed that Thunnus sp. are the most landed (45%) followed by Katsuwonus pelamis (38 %) and others (Xiphias gladius, Coriphaena sp., Elagatis bipinnulatus) of 1.7 %. The dominant fork lengthof Thunnus albacares and Thunnus obesus ranged from about 40 - 170 cm and 40 – 140 cm. Individual weight ranged between 0.1 - 71 kg and 0.5 - 43 kg respectivelly.

scholarly journals Hydrological and trophic characteristics of tuna habitat: consequences on tuna distribution and longline catchability

2002 ◽  
Vol 59 (6) ◽  
pp. 1002-1013 ◽  
Author(s):  
Arnaud Bertrand ◽  
Erwan Josse ◽  
Pascal Bach ◽  
Philippe Gros ◽  
Laurent Dagorn
Keyword(s):  
Regional Scale ◽  
French Polynesia ◽  
Yellowfin Tuna ◽  
Small Scale ◽  
Thunnus Albacares ◽  
Catch Per Unit Effort ◽  
Thunnus Obesus ◽  
Thunnus Alalunga ◽  
Oceanographic Data ◽  
Patch Density

We studied relationships between tropical tunas (albacore (Thunnus alalunga), bigeye (Thunnus obesus), and yellowfin (Thunnus albacares)) and their biotic and abiotic environments through simultaneous acoustic observations of tunas and their prey, experimental longline catch, and oceanographic data in French Polynesia. Vertical habitat limits were estimated based on temperature and dissolved oxygen at capture data. We then studied tuna-micronekton relationships to better understand how tuna occupy the pelagic space. At a regional scale, tunas were more abundant in areas rich in prey with favourable hydrological conditions. Inside such areas, at the scale of a longline set, however, the longline catches were maximal only when prey were not distributed in dense patches (except for yellowfin tuna). We interpreted this result by considering that areas with high prey abundance attract tunas, but at a small scale, if prey are patchy distributed, tunas are more inclined to feed on them rather than on longline baits. The effect of patches on yellowfin tuna catch per unit effort (CPUE) does not appear likely because this species also feeds on the mixed layer, where patch density was very low. Not only hydrological characteristics, but also prey density and prey patch characteristics, should be taken into account for interpreting longline CPUE data.

Incidental catch associated with swordfish longline fisheries in the south-west Atlantic Ocean

1998 ◽  
Vol 49 (7) ◽  
pp. 633 ◽  
Author(s):  
Yamandú H. Marín ◽  
Federico Brum ◽  
Luis C. Barea ◽  
Julio F. Chocca
Keyword(s):  
Abundant Species ◽  
High Price ◽  
The South ◽  
Blue Shark ◽  
Western Atlantic ◽  
Prionace Glauca ◽  
Thunnus Alalunga ◽  
Xiphias Gladius ◽  
Longline Fisheries ◽  
Number Of Individuals

This paper describes the composition of the harvest by species of two vessels operating with two different pelagic longline systems aimed at swordfish (Xiphias gladius). Four zones were surveyed in the Uruguayan EEZ and international waters in the south-western Atlantic. Data were collected by observers on board who recorded the number of individuals in each of the species caught. In all, 50 species were caught, of which 15 were cartilaginous fish, 27 were teleosts and eight were ‘non- fish’ species (birds, mammals and turtles). The most abundant species were blue shark (Prionace glauca) (43%), swordfish (27%) and albacore tuna (Thunnus alalunga) (9%). The abundances of blue shark and of swordfish differed significantly between the two rigging systems and among the four zones. The catch was classified into three marketing groups: primary marketing (swordfish and high-price tuna), secondary marketing (non-target species but marketable) and discards (with no commercial value). In terms of numbers, the first two groups represented between 91% and 72% of the species collected. This percentage may vary if the catch is analysed by weight, as only part of the carcass and shark fins are used. Resumen. Se describe la composición por especies de la captura de dos buques que operaron con dos sistemas diferentes de palangre pelágico dirijido a la extracción de pez espada (Xiphias gladius). Se relevaron quatros áreas que abarcaron la ZEE uruguaya y aguas internacionales en el O. Atlántico. Los datos fueron colectados a bordo por observadores, registrando la captura en número de la totalidad de las especies. Se contabilizó un total de 50 especies capturadas, de las cuales 15 corresponden a peces cartilaginosos, 27 a peces óseos y 8 a ‘non-pisces’ (aves, mamíferos y quelonios). Las especies más representadas fueron el tiburón azul (Prionace glauca) (43%), seguida por pez espada (27%) y albacora (Thunnus alalunga) (9,0%). La presencia de tiburón azul y pez espada mostró diferencias significativas comparando los dos sistemas de construcción del palangre y las zonas. Se clasificó la captura en tres grupos de comercialización: comercialización primaria (pez espada y atunes de elevado valor), comercialización secundaria (especies diferentes de la objetivo pero comercializables), y decarte (sin valor comercial). Las dos primeras acumularon entre el 91% y 72% de las piezas capturadas. Este porcentaje puede variar si se analiza la captura en peso, ya que de los tiburones se aprovechan las aletas y solamente parte de las carcasas.

scholarly journals JENIS DAN DISTRIBUSI UKURAN IKAN HASIL TANGKAP SAMPINGAN (BY CATCH) RAWAI TUNA YANG DIDARATKAN DI PELABUHAN BENOA BALI

2017 ◽  
Vol 5 (4) ◽  
pp. 453-460
Author(s):  
Skar Puji Astuti ◽  
Abdul Ghofar ◽  
Suradi Wijaya Saputra ◽  
Budi Nugraha
Keyword(s):  
Thunnus Albacares ◽  
Distribution Analysis ◽  
Target Species ◽  
Catch Per Unit Effort ◽  
Prionace Glauca ◽  
Thunnus Obesus ◽  
Southern Bluefin Tuna ◽  
By Catch ◽  
Research Show ◽  
Tuna Longline

ABSTRAK Hasil tangkapan rawai tuna terdiri dari dua jenis yaitu hasil tangkapan utama (target species) dan hasil tangkapan sampingan (by catch). Penelitian ini bertujuan untuk mendapatkan informasi jenis ikan hasil tangkapan utama dan ikan hasil tangkapan sampingan rawai tuna, menghitung komposisi ikan, menganalisa distribusi ukuran ikan dan mengetahui nilai CPUE ikan HTU dan ikan HTS. Penelitian dilaksanakan pada bulan April-Mei 2016 dengan mengikuti kegiatan sampling enumerator Loka Penelitian Perikanan Tuna Benoa, Bali. Hasil penelitian menunjukkan jenis ikan hasil tangkapan utama rawai tuna yaitu ikan Tuna mata besar (Thunnus obesus), Tuna sirip kuning (Thunnus albacares), Tuna sirip biru selatan (Thunnus maccoyii) dan Tuna albakora (Thunnus allalunga). Jenis ikan hasil tangkapan sampingan rawai tuna yang mendominasi yaitu ikan opah (Lampris guttatus), hiu air (Prionace glauca) dan escolar (Lepidocybium flavobrunneum). Perbandingan komposisi ikan hasil tangkapan utama yaitu 69% dan ikan by catch 31%. Distribusi ukuran ikan hasil tangkapan sampingan sebagian besar sudah memenuhi kriteria ikan layak tangkap. CPUE ikan hasil tangkapan sampingan lebih rendah dibandingkan dengan ikan hasil tangkapan utama. Kata kunci: Hasil Tangkapan Sampingan (by catch), Rawai Tuna, Pelabuhan Benoa Bali, Samudera Hndia.  ABSTRACT Catch of Tuna longline has two types, that is target species and by catch product. This research aims to determine the information type of target species and species by catch, calculate the composition of the fish, size of distribution analysis and determine the CPUE (Catch per unit effort) of species by catch and target species. This research is conducted in April-May 2016 following the sampling enumerator activities of Benoa port. The results of the research show that the type of target species Tuna Longline there are Big eye tuna (Thunnus obesus), Yellow fin tuna (Thunnus albacares), Southern bluefin tuna (Thunnus maccoyii) and Albakora (Thunnus allalunga). The types of species by catch Tuna Longline dominates that is Opah (Lampris guttatus), Shark (Prionace glauca) and Escolar (Lepidocybium flavobrunneum). Comparison of the composition target species is 69% and species by catch is  31%. The size distribution of species by catch already most the criteria of decent fish caught. CPUE of species by catch was lower than. Keywords: bycatch, tuna longline, benoa port, indian Ocean

scholarly journals Unusual Localization of Pennella sp. in Swordfish (Xiphias gladius) Hearts

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1757
Author(s):  
Davide Mugetti ◽  
Elena Colombino ◽  
Vasco Menconi ◽  
Fulvio Garibaldi ◽  
Walter Mignone ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Pelagic Fish ◽  
Genetic Identification ◽  
Wall Thickening ◽  
Histopathological Analysis ◽  
Aquatic Species ◽  
Atrial Wall ◽  
Internal Organs ◽  
Xiphias Gladius ◽  
Species Inquirendae

The genus Pennella comprises hematophagous parasites of marine aquatic species, including cephalopods, marine mammals, and pelagic fish. Nine species have been officially included in the genus Pennella plus another six species inquirendae. They are most often found in the host’s musculature, without penetrating internal organs. For the present study, 83 hearts from swordfish (Xiphias gladius) caught in the Mediterranean Sea were sampled and immediately fixed in formalin for histopathological analysis. In total, 10 (12.05%) hearts were found to be parasitized by copepods of the genus Pennella. Macroscopically, there was mild-to-severe fibrinous pericarditis with atrial wall thickening and multiple parasitic nodules. Histologically, the parasitic nodules were surrounded by an inflammatory-necrotizing reaction. Parasitic infestation by Pennella spp. is common in pelagic fish and in swordfish, in particular. Here, however, we report atypical cardiac localization. A future area of focus is the evaluation of cardiac Pennella spp. infestation by histopathology and genetic identification of the parasites.

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