scholarly journals First reports of Megamouth Shark, Megachasma pelagios Taylor, Compagno & Struhsaker, 1983 (Lamniformes, Megachasmidae),& in Peru

Check List ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 1361-1367
Author(s):  
Shaleyla Kelez ◽  
Rossana Maguiño Napuri ◽  
Alejandra Mendoza Pfennig ◽  
Oswaldo Caldas Martinez ◽  
Antonio Torres Carrasco
Keyword(s):  
Purse Seine ◽  
Shark Species ◽  
Southern Limit ◽  
Total Length ◽  
Female Total ◽  
Megamouth Shark

Megamouth Shark, Megachasma pelagios Taylor, Compagno & Struhsaker, 1983, is one of the least-known shark species worldwide. We report the encounters of four megamouth sharks: one caught in a driftnet off Piura (November 2016; sex indeterminate), one landed in Los Organos (July 2018; female), one stranded in El Ñuro (July 2018; sex indeterminate, ca 300 m total length), and one caught in a purse seine off Lambayeque (June 2019; female, total length ca 300 cm). These are the first records from Peru and expand the species’ known southern limit by 415 km. With the addition of M. pelagios, there are 67 species of sharks in Peru.

scholarly journals Occurrence of Bluntnose Sixgill Shark Hexanchus griseus (Bonnaterre, 1788) in Yeşilovacık Bay, Northeastern Mediterranean

2019 ◽  
pp. 1-7
Author(s):  
Deniz Ayas ◽  
Deniz Ergüden ◽  
Nuray Çiftçi ◽  
Mısra Bakan
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Mediterranean Coast ◽  
Shark Species ◽  
Female Specimen ◽  
The West ◽  
Protection Measures ◽  
Total Length ◽  
Iskenderun Bay ◽  
Specific Conservation

Aims: In this study, an individual of H. griseus was caught from the Mersin Bay and this ichthyologic note presents a new female record of H. griseus for Mersin Bay, Mediterranean coast of Turkey. This study aims to contribute to the chronological records of the species in the Mediterranean Sea. Place and Duration of Study: Yeşilovacık bay is a small bay in the west of Mersin Bay. Yeşilovacık bay which lies at approximately 36°07’n latitude, 33°37’e, longitude and about 143 km Western of in Mersin province, Turkey. Sample: On 19 March 2018 blunthose sixgill shark specimen was measured and then deposited in the Museum of the Systematic, Faculty of Fisheries, University of Mersin. Methodology: A female specimen of H. griseus with a total length (TL) of 350 cm (400 kg) was captured by a commercial trawl at a depth around of 280 m of the Yeşilovacık Bay (Northeastern Mediterranean Sea), Turkey. Total length was measured to the nearest 1 mm and the weight of the specimen was determined to the nearest kilogram. Results: Measurements of the specimen are presented and compared with the previous records of H. griseus in the Eastern Mediterranean coast of Turkey (Iskenderun Bay), which are given in Table. The identification was carried out according to the previous report. Conclusion: To date specific conservation measures are not known for this species for the Northeastern Mediterranean coast of Turkey. Thus, the effect of coastal fishery for sharks should be regularly monitored and protection measures should be taken in this region in order for this shark species to continue their conservation for the next generation.

scholarly journals CARACTERIZACIÓN DE LA PESCA DEL TIBURÓN MARTILLO SPHYRNA LEWINI , EN LA PARTE EXTERNA DEL GOLFO DE NICOYA, COSTA RICA

2009 ◽  
Vol 1 ◽  
pp. 175 ◽  
Author(s):  
Ilena Zanella ◽  
Andrés López ◽  
Rándall Arauz
Keyword(s):  
Costa Rica ◽  
Outer Part ◽  
Shark Species ◽  
Central Pacific ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Total Length ◽  
Management Actions ◽  
Scalloped Hammerhead ◽  
Gulf Of Nicoya

En el ámbito nivel mundial, el tiburón martillo (Sphyrna lewini) es una de las especies más afectadas por la sobrepesca y el aleteo. Recientemente se incorporó a la Lista Roja de la UICN como especie en peligro de extinción. El presente estudio pretendió caracterizar la pesca y la distribución de S. lewini en la parte externa del Golfo de Nicoya. Para lograr este propósito, se realizaron muestreos entre marzo del 2006 y mayo del 2007 y se analizaron los tiburones martillo capturados por pescadores artesanales afiliados a la Cooperativa artesanales de Pescadores de Tárcoles (CoopeTárcoles R. L.), que faenan en la parte externa del Golfo de Nicoya. Para cada tiburón, se determinó la longitud total, la zona de pesca donde se capturó y el arte utilizado. En total se analizaron 273 tiburones. Se identificó un área de crianza primaria en el Peñón y se determinó que existe una relación lineal positiva entre la longitud total y la profundidad de la zona de pesca (R2 = 0.4296; p ‹ 0.0001), y la longitud total y la distancia de la zona de pesca de la desembocadura del río Grande de Tárcoles (R2 = 0.4052; p ‹ 0.0001). Los tiburones de menor tamaño (crías) se encontraron en la zona del Peñón, donde las aguas son poco profundas, turbias y productivas, ofreciendo a las crías alimento y protección de los depredadores. Por lo cual, se recomienda proteger esta zona, en particular en marzo, abril y mayo, época de nacimiento de las crías.The scalloped hammerhead shark (Sphyrna lewini) is one of the shark species most impacted by overfishing, and is currently listed by the IUCN Red List as an Endangered.  This research sought to characterize the distribution of S. lewini in the external area of Gulf of Nicoya, central Pacific coast of Costa Rica, based on observations from a coastal artisanal fishery. From March 2006 to May 2007, we analyzed scalloped hammerhead shark landings by members of the Tarcoles Artisanal Fishermen's Cooperative (CoopeTárcoles R. L.), who operate in the outer part of the Gulf of Nicoya. We measured the total length of each shark, recorded the reported location of capture, and the gear used. In total, we recorded data for 273 sharks landed. We determined that total length holds a positive linear relationship with the depth of the fishing area (R2 = 0.4296, *** p <.0001) as well as with the distance from the mouth of the Tárcoles River (R2 = 0.4052, *** p <.0001). The smaller sharks (pups) were caught in a fishing site known as Peñon, slightly north of the mouth of the Tarcoles River, where the waters are shallow, turbid and highly productive, providing food and shelter for the pups.  As pups mature and attain larger sizes, they move towards deeper waters away from the Tarcoles River, out of the Gulf of Nicoya. We identify Peñon as a primary nursery for scalloped hammerhead sharks, and recommend management actions that seek to reduce fishing effort between March and May, when pups are born.

scholarly journals Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

2020 ◽  
Author(s):  
Zoya Tyabji ◽  
Tanmay Wagh ◽  
Vardhan Patankar ◽  
Rima W. Jabado ◽  
Dipani Sutaria
Keyword(s):  
Life History ◽  
Fishery Management ◽  
Habitat Preferences ◽  
Cost Effective ◽  
Shark Species ◽  
Andaman And Nicobar Islands ◽  
Total Length ◽  
Nicobar Islands ◽  
Gravid Females ◽  
Catch Composition

ABSTRACTThe scientific literature on the diversity and biological characteristics of sharks and rays from the Andaman and Nicobar Archipelago fishing grounds is scarce and compromised by species misidentifications. We carried out systematic fish landing surveys in South Andamans from January 2017 to May 2018, a comprehensive and cost-effective way to fill this data gap. We sampled 5,742 individuals representing 57 shark and ray species. Of the 36 species of sharks and 21 species of rays landed, six species of sharks - Loxodon macrorhinus, Carcharhinus amblyrhynchos, Sphyrna lewini, Carcharhinus albimarginatus, Carcharhinus brevipinna, and Paragaelus randalli dominated landings and comprised 83.35 % of shark landings, while three species of rays were most abundant – Pateobatis jenkinsii, Himantura leoparda and H. tutul, and comprised 48.82 % of ray landings. We report size extensions for seven shark species as well as three previously unreported ray species, increasing the known diversity for the islands and for India. For sharks, mature individuals of small-bodied species (63.48 % males of total landings of species less than 1.5 m total length) and immature individuals of larger species (84.79 % males of total landings of species larger than 1.5 m total length) were mostly landed; whereas for rays, mature individuals were predominantly landed (80.71 % males of total landings) likely reflecting differences in fishing patterns as well as habitat preferences and life history stages across species. Further, juvenile sharks and gravid females were landed in large quantities which might be unsustainable in the long-term. Landings were female-biased in C. amblyrhynchos, S. lewini and P. jenkinsii, and male-biased in L. macrorhinus and H. leoparda, indicating either spatio-temporal or gear specific sexual segregation in these species. Understanding these nuances - the composition and biology of sharks and rays landed in different fisheries seasonally will inform future conservation and fishery management measures for these species in the Andaman and Nicobar Islands.

scholarly journals On the maximum length for Sardinella aurita (Osteichthyes: Clupeidae) from the Mediterranean Sea

2021 ◽  
Vol 6 (3) ◽  
pp. 29-34
Author(s):  
L. Bensahla-Talet ◽  
A. Bensahla-Talet
Keyword(s):  
Mediterranean Sea ◽  
Maximum Length ◽  
Purse Seine ◽  
Total Length ◽  
Sardinella Aurita ◽  
The Mediterranean

Two specimens of round sardinella, Sardinella aurita Valenciennes, 1847, with a total length of 39.1 and 36.6 cm and a weight of 359.01 and 293.48 g, respectively, were caught by a purse seine net in Bouzedjar Bay, Algeria, on 8 August, 2019. These sizes of both specimens are the maximum recorded for this species in the Mediterranean Sea.

scholarly journals Morphometric and DNA Barcoding of endemic Halmaheran walking shark (Hemiscyllium halmahera, Allen, 2013) in North Maluku, Indonesia

2020 ◽  
Vol 21 (7) ◽  
Author(s):  
Hawis MADDUPPA ◽  
ARINI S. P. PUTRI ◽  
RIDHO Z. WICAKSONO ◽  
BEGINER SUBHAN ◽  
NEBUCHADNEZZAR AKBAR ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Phylogenetic Reconstruction ◽  
New Guinea ◽  
Molecular Characteristics ◽  
Sufficient Information ◽  
Shark Species ◽  
Tissue Samples ◽  
Total Length ◽  
Bamboo Shark ◽  
Length Analysis

Abstract. Madduppa H, Putri ASP, Wicaksono RZ, Subhan B, Akbar N, Ismail F, Arafat D, Prabuning D, Sani LMI, Srimariana ES, Baksir A, Bengen DG. 2020. Morphometric and DNA Barcoding of endemic Halmaheran walking shark (Hemiscyllium halmahera, Allen, 2013) in North Maluku, Indonesia. Biodiversitas 21: 3331-3343. The walking shark (Hemiscyllium halmahera) commonly referred to as bamboo shark, is a shark species that belongs to the Hemiscyllidae family which is endemic in North Maluku, and Indonesian waters. These Hemiscyllium species are generally confined to the Australian-New Guinea region, save a specie which originates from Halmahera, an Indonesian island. Ever since its discovery, sufficient information on its existence has been largely unavailable. Hence, the purpose of this study is (1) to assess the morphology, using meristic measurements and length-weight relationship, and (2) to determine the molecular characteristics through DNA barcoding, phylogenetic reconstruction, and genetic diversity. The samples used in this research were obtained from Halmahera Archipelago, North Maluku, including Halmahera, Tidore, Ternate, Maitara, and Guraici in several expeditions between March 2017 and January 2018. 36 individuals in total were measured for morphometric parameters including Total Length (TL), Standard Length (SL), Head Length (HL), Body Circumference (BC), and Body Weight (BW). Out of a total of 36 sharks, tissue samples were obtained from 32 individuals for molecular identification. After the required measurements were obtained, all individuals sharks were released back to their habitat safely. Equations of linear regression were used to analyze the relationship between length and weight. Morphometric measurements indicated that the average total length of the walking shark samples obtained, were not more than 75± cm for both male and female specimens. The length-weight analysis revealed a positive allometric growth pattern in H. halmahera species, where weight was gained faster than an increase in length. The results of the DNA fragment length analysis from all samples were 793-bp. All 32 tissue samples identified as H. halmahera consisted of 3 samples from Ternate Island, 14 samples from Maitara Island, 9 samples from Guraici Island (South Halmahera), 10 samples from Central Halmahera, and 2 samples from Tidore Island. These results confirmed that DNA subsequence analysis indicates that H. halmahera is different from those sequences extracted from Genbank in the Australia-New Guinea region. This study successfully identified H. halmahera based on their morphological and molecular characters, and has therefore contributed to international genetic database (Barcoding Of Life Database-BOLD) for further studies.

scholarly journals Reproductive biology of the Brazilian blind electric ray Benthobatis kreffti (Chondrichthyes: Narcinidae)

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Mariana F. Martins ◽  
Otto B. F. Gadig
Keyword(s):  
Reproductive Biology ◽  
Southeastern Brazil ◽  
Natural Death ◽  
Total Length ◽  
Large Size ◽  
Female Total ◽  
Elasmobranch Species ◽  
Late Maturity ◽  
Near Term ◽  
Size At Birth

ABSTRACT This study provides information on the reproductive biology of the Brazilian blind electric ray Benthobatis kreffti, endemic to southern and southeastern Brazil. Individuals were caught by bottom trawl carried out in 2003 and 2007, at 492-501 m depth off the São Paulo State continental slope. A total of 152 females (115-299 mm) and 144 males (91-243 mm) were sampled. Maturity was first observed at 177 and 162 mm, with total length at 50% maturity of 191 and 176 mm in females and males respectively. Uterine fecundity ranged from 1-3 and was not related to female total length. Size at birth estimated from the largest near-term observed embryos and smallest free-swimming ray was 91-100 mm. The low fecundity observed is typical of deepwater elasmobranch species, as well as late maturity in comparison with costal species. The relatively large size-at-birth suggests that this species invests more in length of each embryo than in litter size, increasing the offspring’s survival chance. In this context, these parameters highlight the vulnerability of this and other deepwater species to non-natural death, mostly caused by deep-sea fisheries.

scholarly journals KOMPOSISI HASIL TANGKAPAN PUKAT CINCIN HUBUNGANNYA DENGAN TEKNOLOGI PENANGKAPAN IKAN RAMAH LINGKUNGAN (Catch Composition of Purse Seine in Relation to Environmental Friendly Fishing Technology)

2016 ◽  
Vol 6 (2) ◽  
pp. 177
Author(s):  
Rita L. Bubun ◽  
Amir Mahmud
Keyword(s):  
Purse Seine ◽  
Survey Analysis ◽  
Total Length ◽  
Environmental Friendly ◽  
Euthynnus Affinis ◽  
Catch Composition

<p>ABSTRACT<br /><br />The utilization of resources has been using purse seine by light fishing, providing opportunities was captured diverse of total length and volume species. The purpose of this research is determining the composition of total length and volume species of the catch in the purse seine unit by light fishing and determining the level of environmental friendly for purse seine unit by light fishing. The method of research is survey. Analysis of data: (1) the descriptive quantitative to determine the composition of total length and volume species of the catch purse seine unit by light fishing; (2) the analysis of the level of sustainable according to the nine criteria of FAO. The results of research shows: (1) the composition of total length of the catches in purse seine unit by light fishing are the index 1,602 in the total length of 14 cm – 21 cm. The composition of the volume of total length that feasible of catch in percentage 78% and dominated species is the Euthynnus affinis in 48%; (2) the level of environmental friendly for purse seine unit by light fishing in a score 27 and the category environmental friendly.<br /><br />Keywords: environmental friendly, light fishing, purse seine</p><p>-------<br /><br />ABSTRAK<br /><br />Pemanfaatan sumberdaya perikanan menggunakan pukat cincin dengan alat bantu cahaya (light fishing), memberikan peluang tertangkapnya beranekaragam ukuran dan volume spesies. Tujuan penelitian menentukan komposisi hasil tangkapan ikan berdasarkan ukuran panjang dan volume setiap jenis ikan pada unit penangkapan pukat cincin yang menggunakan light fishing dan menentukan tingkat keramahan lingkungan unit penangkapan pukat cincin yang menggunakan light fishing. Metode penelitian yaitu survei. Penelitian dilaksanakan pada bulan Januari – Juni 2015. Analisis data yang digunakan yaitu: 1) deskriptif kuantitatif untuk menentukan keankeragaman ukuran panjang dan volume setiap jenis hasil tangkapan pukat cincin yang menggunakan light fishing; dan 2) Analisis tingkat keramahan lingkungan berdasarkan sembilan kriteria FAO. Hasil penelitian menunjukkan: 1) Keanekaragaman ukuran panjang ikan hasil tangkapan pada pukat cincin dengan menggunakan light fishing berada pada nilai indeks 1,602 dengan ukuran panjang didominasi pada ukuran 14 cm – 21 cm. Nilai indeks menunjukkan pada spesies ikan yang sama memiliki komposisi ukuran panjang total beranekaragam. Komposisi volume ukuran panjang ikan yang belum layak tangkap sebesar 78% dan didominasi spesies ikan tongkol komo sebesar 48%; dan 2) Tingkat keramahan lingkungan unit penangkapan ikan pukat cincin menggunakan light fishing dengan nilai skor 27 pada kategori ramah lingkungan.<br /><br />Kata kunci: pukat cincin, light fishing, ramah lingkungan</p>

scholarly journals Spatial–Temporal Distribution of Megamouth Shark, Megachasma pelagios, Inferred from over 250 Individuals Recorded in the Three Oceans

Animals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2947
Author(s):  
Chi-Ju Yu ◽  
Shoou-Jeng Joung ◽  
Hua-Hsun Hsu ◽  
Chia-Yen Lin ◽  
Tzu-Chi Hsieh ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
Western North Pacific ◽  
North Pacific Ocean ◽  
Temporal Distribution ◽  
Shark Species ◽  
Western North Pacific Ocean ◽  
The North ◽  
Megamouth Shark ◽  
The Vertical Distribution

The megamouth shark (Megachasma pelagios) is one of the rarest shark species in the three oceans, and its biological and fishery information is still very limited. A total of 261 landing/stranding records were examined, including 132 females, 87 males, and 42 sex unknown individuals, to provide the most detailed information on global megamouth shark records, and the spatial–temporal distribution of M. pelagios was inferenced from these records. The vertical distribution of M. pelagios ranged 0–1203 m in depth, and immature individuals were mostly found in the waters shallower than 200 m. Mature individuals are not only able to dive deeper, but also move to higher latitude waters. The majority of M. pelagios are found in the western North Pacific Ocean (>5° N). The Indian and Atlantic Oceans are the potential nursery areas for this species, immature individuals are mainly found in Indonesia and Philippine waters. Large individuals tend to move towards higher latitude waters (>15° N) for foraging and growth from April to August. Sexual segregation of M. pelagios is found, females tend to move to higher latitude waters (>30° N) in the western North Pacific Ocean, but males may move across the North Pacific Ocean.

Sign in / Sign up

Export Citation Format

Share Document