scholarly journals PENGELOLAAN IKAN BATAK (Neolissochilus thienemanni) DI PERAIRAN UMUM DARATAN, DANAU TOBA, PROVINSI SUMATERA UTARA

2019 ◽  
Vol 2 (2) ◽  
pp. 73
Author(s):  
Basuki Rachmad ◽  
Emalia Sihombing ◽  
Nunung Sabariyah
Keyword(s):  
Sex Ratio ◽  
Iucn Red List ◽  
Red List

ABSTRAK            Ikan batak (Neolissochilus thienemanni) merupakan ikan endemik Sumatera Utara khususnya Danau Toba, Hulu Sungai Asahan, dan telah masuk dalam kategori terancam punah (vulnerable) berdasarkan IUCN Red List dan sudah sangat sulit untuk ditemukan di habitat alaminya. Ikan ini termasuk famili Cyprinidae yang merupakan ikan omnivora dan hidup di sungai beraliran deras. Tujuan penelitian untuk mengetahui aspek biologi, aspek perikanan, kualitas perairan serta upaya pengelolaan ikan batak. Lokasi penelitian adalah tiga kabupaten di Provinsi Sumatera Utara pada bulan Agustus hingga Oktober 2018. Penelitian ini dilakukan dengan menggunakan metode sensus. Hasil pengamatan ditemukan 38 ekor ikan batak (25 ekor jantan; 13 ekor betina) dengan ukuran panjang berkisar 16 s.d 41.9 cm dan berat berkisar 73 s.d 392 gram. Pertumbuhannya bersifat allometrik negatif. Sex ratio menunjukkan tidak ada perbedaan nyata antara jantan dan betina (1 : 0,52).  Di dominansi adalah TKG III dengan jumlah 16 ekor (11 ekor jantan ; 5 ekor betina). Nilai Lc = jantan 26,00 cm; betina = 25,04 cm, dan Lm = jantan 25,89 cm; betina 23,29 cm. Hubungan antara Lc dan Lm menunjukkan bahwa ikan yang tertangkap sudah matang gonad terlebih dahulu. Kebiasaan makan ikan didominasi oleh biji-bijian 37%, plankton 25%, siput 22% dan serangga 16%. Berdasarkan hasil penelitian, belum adanya pengelolaan yang berkelanjutan mengenai ikan batak, baik dari pemerintah maupun masyarakat lokal. Jika dalam waktu panjang penangkapan ikan endemik terus meningkat, maka akan mengakibatkan hilangnya populasi sementara ikan batak dan perubahan rantai makanan.

scholarly journals Aspek Biologi Pari Kekeh (Rhynchobatus sp. (Rhinidae:Chondrichthyes)) Studi Kasus di PPN Brondong, Lamongan

2021 ◽  
Vol 10 (1) ◽  
pp. 78-88
Author(s):  
Lara Azidha ◽  
Irwani Irwani ◽  
Munasik Munasik
Keyword(s):  
Sex Ratio ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
High Price ◽  
Chi Square ◽  
Gonad Maturity ◽  
A Value ◽  
Good Taste ◽  
Biological Aspects

Pari kekeh (Rhynchobatus sp.) adalah organisme laut yang tergolong dalam Subkelas Elasmobranchii dan dikelompokkan ke dalam Kelas Chondrichthyes. Pari kekeh sering ditangkap dikarenakan dagingnya memiliki rasa yang enak, Selain itu, sirip Pari kekeh memiliki harga yang mahal  di China dan Global. Pari kekeh telah masuk kedalam daftar IUCN red list kategori critically endangered akibat eksploitasi berlebihan. Hal ini apabila terus terjadi maka ketersedian sumber daya Pari kekeh di habitatnya terancam punah. Oleh karena itu, perlu adanya pengaturan agar tidak terjadi eksploitasi berlebihan yang berdampak pada populasi pari kekeh, salah satunya dengan melakukan analisis aspek biologi. Tujuan dari penelitian ini untuk mengetahui hubungan panjang berat, nisbah kelamin, tingkat kematangan gonad, ukuran pertama kali matang gonad dan fekunditas Pari kekeh yang didaratkan di PPN Brondong. Sampel yang digunakan yaitu pari kekeh sebanyak 160 ekor. Penelitian ini menggunakan metode deskriptif dengan mengukur data panjang total dan standar, bobot, pengamatan gonad. Pola pertumbuhan Pari kekeh yaitu allometrik negatif (b = 2,52). Nisbah kelamin = 0,625 (Chi Square) dengan X tabel = 3,975, maka jumlah Pari jantan dan betina seimbang. Kematangan gonad Pari Rhynchobatus sp. sebesar 53%. Ukuran pertama kali matang gonad Pari kekeh jantan memiliki panjang total 48,97-49,16 cm dan Pari kekeh betina memiliki panjang total 95,29-98,60 cm. Nilai fekunditas Pari kekeh berkisar antara 5-16 butir pada kisaran panjang total tubuh 86-114 cm.  Kekeh Stingrays (Rhynchobatus sp.) are marine organisms that classified to the Elasmobranchii subclass and grouped into the Chondrichthyes Class. Kekeh Stingrays is often caught because has a good taste. In addition, Kekeh Stingrays fins have a high price in the Stingray and Shark fin trade in China and Global. Kekeh Stingrays has entered into the IUCN red list in the critically endangered category due to overexploitation. If excessive exploitation continues, the availability of Stingray resources in their habitat will be threatened. Therefore, there is a need for control to avoid overexploitation that affects the population of Kekeh Stingrays, one of which is by analyzing the biological aspects. The purpose of this study was to determine the length and weight correlation, sex ratio, gonad maturity level, size of the first gonad maturity, and fecundity of Kekeh Stingray which was landed in PPN Brondong. The samples used were 160 Kekeh Stingrays. This research uses descriptive method by measuring the total and standard length, weight, also gonad observations. The results obtained are the length and weight correlation of Stingray Kekeh which is negative allometric with a value of b = 2.52. The sex ratio based on Chi Square (x2) = 0,625 with X table = 3,975, that means the number of male and female Stingray is balanced. The value of  TKG II and TKG III of Rhinchobatus sp.that is, 53% is dominated by matured Rays. The first size of gonad maturity for rays was in a range 48,97-49,16 cm, while for female rays was in a range 95,29-98,60 cm. The Value of Kekeh Stingrays’s fecundity was around 5-16 eggs with the total length range is 86-114 cm.

scholarly journals Giant otter Pteronura brasiliensis density and abundance in Llanos Orientales de Colombia in the Orinoco basin

Oryx ◽  
2020 ◽  
pp. 1-4
Author(s):  
Germán Garrote ◽  
Beyker Castañeda ◽  
Jose Manuel Escobar ◽  
Laura Pérez ◽  
Brayan Marín ◽  
...  
Keyword(s):  
South America ◽  
Population Size ◽  
20Th Century ◽  
Conservation Status ◽  
Species Conservation ◽  
Iucn Red List ◽  
Red List ◽  
Recreational Fishing ◽  
Pteronura Brasiliensis ◽  
Direct Counts

Abstract The giant otter Pteronura brasiliensis, categorized as Endangered on the IUCN Red List, was once widely distributed throughout South America. By the middle of the 20th century the giant otter had become locally extinct along the main rivers of the Orinoco basin. Although some populations seem to have recovered, the paucity of information available does not permit a full evaluation of the species' conservation status. The objective of this study was to estimate the abundance and density of the giant otter population along the Orinoco river in the municipality of Puerto Carreño, Vichada, Colombia, where there is important commercial and recreational fishing. Thirty-nine linear km were surveyed, repeatedly, with a total of 315 km of surveys. Population size was estimated by direct counts of individuals. All individuals detected were photographed and identified individually from their throat pelage patterns. In total, 30 otters were identified, giving a minimum density of 0.77 individuals per km, one of the highest reported for the species in Colombia. Given the high density in this well-developed area, our results highlight the importance of this population for the conservation of the species.

scholarly journals Distribution and illegal killing of the Endangered Indian pangolin Manis crassicaudata on the Potohar Plateau, Pakistan

Oryx ◽  
2017 ◽  
Vol 53 (1) ◽  
pp. 159-164 ◽  
Author(s):  
Tariq Mahmood ◽  
Faraz Akrim ◽  
Nausheen Irshad ◽  
Riaz Hussain ◽  
Hira Fatima ◽  
...  
Keyword(s):  
Information System ◽  
Food Web ◽  
Geographical Information System ◽  
Iucn Red List ◽  
Red List ◽  
Geographical Information ◽  
Illegal Hunting ◽  
Iucn Red List Assessment ◽  
Iucn Assessment ◽  
Illegal Killing

AbstractThe Endangered Indian pangolin Manis crassicaudata, a burrowing, armoured mammal, plays an important role in the food web by consuming insects and termites. In Pakistan the species’ range includes the 22,000 km2 Potohar Plateau, where it is under pressure from illegal hunting for its scales and requires conservation attention. We used a geographical information system to quantify the range of the Indian pangolin on the Plateau and to compare this with the range estimated in the IUCN Red List assessment of the species. We found that the species occupies c. 89% of the Plateau, in eight of the 10 protected areas, compared with the IUCN estimate of 71%, and we recorded the species at 40 locations on the Plateau outside the range predicted by the IUCN assessment. We collected data on the illegal capture and killing of the species, recording 412 individuals that had been killed at 48 locations between January 2011 and the end of April 2013. The highest number of killings was recorded in Chakwal District (n = 156, at 13 sites) followed by the Attock District (n = 149, at eight sites). Although the Indian pangolin's range on the Potohar Plateau is c. 18% larger than that estimated in the IUCN assessment, the species is under pressure from illegal killing and requires urgent conservation measures to save the small remaining population and avoid the extirpation of this vital insectivorous predator from the area.

Calculating population reductions of invertebrate species for IUCN Red List assessments

2021 ◽  
Author(s):  
H. Reşit Akçakaya ◽  
Axel Hochkirch ◽  
Jason T. Bried ◽  
Roy H. A. van Grunsven ◽  
John P. Simaika ◽  
...  
Keyword(s):  
Iucn Red List ◽  
Red List ◽  
Invertebrate Species

scholarly journals Assessment of the rarity and conservation status of the Colombian endemic brown hairy dwarf porcupine Coendou vestitus

Oryx ◽  
2020 ◽  
pp. 1-6
Author(s):  
María M. Torres-Martínez ◽  
Héctor E. Ramírez-Chaves ◽  
Elkin A. Noguera-Urbano ◽  
Fernando C. Passos
Keyword(s):  
Small Body ◽  
Conservation Status ◽  
Natural Habitat ◽  
Habitat Type ◽  
Iucn Red List ◽  
Red List ◽  
Small Range ◽  
Minimum Convex Polygon ◽  
Area Of Occupancy ◽  
Species Rarity

Abstract The brown hairy dwarf porcupine Coendou vestitus is a poorly studied Andean species endemic to Colombia. Its current Red List category is contradictory: globally it is categorized as Data Deficient but in Colombia it is categorized as Vulnerable. This contradiction has limited the implementation of conservation programmes. We evaluate the level of rarity of the species and provide consolidated information for a new assessment of its Red List status. We reviewed literature, photographs, and voucher specimens in natural history collections. Using the confirmed records, we estimated the extent of occurrence (EOO) based on the minimum convex polygon and the area of occupancy (AOO) summing the area of grid squares occupied by the species. We found that C. vestitus is very rare, with a small range, low estimated population density, occurrence in only one habitat type and small body size. The species has an EOO of 3,323 km2 and an AOO of 24 km2, based on six confirmed localities, all on the western slopes of the Eastern Cordillera, in the central Andean region of Colombia. Based on the species' rarity, restricted distribution, and threats to its natural habitat, we recommend its categorization as Endangered on the IUCN Red List. This will help delineate research and conservation efforts for this porcupine, which has a highly restricted range and inhabits the threatened Andean forest.

scholarly journals Bat species richness in the region of the Central Valleys of Oaxaca, Mexico

2019 ◽  
pp. 1-11
Author(s):  
M. García–Luis ◽  
M. Briones–Salas ◽  
M. C. Lavariega
Keyword(s):  
Species Richness ◽  
Iucn Red List ◽  
Red List ◽  
Risk Category ◽  
Echolocation Calls ◽  
Mustached Bat ◽  
Pteronotus Parnellii ◽  
Urbanized Region ◽  
Bat Diversity

We present a revised checklist of bat species occurring in the semi–urbanized region of the Central Valleys of Oaxaca, Mexico. The checklist is based on surveys using mist nets, recordings of echolocation calls, data from literature, and museum databases. Results show that the Central Valleys of Oaxaca have a species richness of 33 bat species belonging to 22 genera and five families. Species like the Mustached bat Pteronotus parnellii, the Western Red bat Lasiurus blossevillii and the Free–tailed bat Promops centralis were recorded after 32, 30 and 19 years respectively according to the records of the literature. We also recorded four species classified in some risk category according to either the Mexican government’s red list (NOM–059) or the IUCN red list. The recordings of the echolocation calls are the first from the region of Central Valleys of Oaxaca. Bat diversity in the Central Valleys of Oaxaca was underestimated and emphasizes the need for further research

scholarly journals Conservation Status of Marine Biodiversity in Oceania: An Analysis of Marine Species on the IUCN Red List of Threatened Species

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Beth A. Polidoro ◽  
Cristiane T. Elfes ◽  
Jonnell C. Sanciangco ◽  
Helen Pippard ◽  
Kent E. Carpenter
Keyword(s):  
Threatened Species ◽  
Environmental Changes ◽  
Extinction Risk ◽  
Conservation Status ◽  
Marine Species ◽  
Iucn Red List ◽  
Red List ◽  
Marine Biodiversity ◽  
Conservation Priorities ◽  
Conservation Action

Given the economic and cultural dependence on the marine environment in Oceania and a rapidly expanding human population, many marine species populations are in decline and may be vulnerable to extinction from a number of local and regional threats. IUCN Red List assessments, a widely used system for quantifying threats to species and assessing species extinction risk, have been completed for 1190 marine species in Oceania to date, including all known species of corals, mangroves, seagrasses, sea snakes, marine mammals, sea birds, sea turtles, sharks, and rays present in Oceania, plus all species in five important perciform fish groups. Many of the species in these groups are threatened by the modification or destruction of coastal habitats, overfishing from direct or indirect exploitation, pollution, and other ecological or environmental changes associated with climate change. Spatial analyses of threatened species highlight priority areas for both site- and species-specific conservation action. Although increased knowledge and use of newly available IUCN Red List assessments for marine species can greatly improve conservation priorities for marine species in Oceania, many important fish groups are still in urgent need of assessment.

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