scholarly journals New records of sharks (Elasmobranchii) from the Andaman and Nicobar Archipelago in India with notes on current checklists

2018 ◽  
Vol 6 ◽  
Author(s):  
Zoya Tyabji ◽  
Rima Jabado ◽  
Dipani Sutaria
Keyword(s):  
Geographical Location ◽  
Shark Species ◽  
Tiger Shark ◽  
Limited Information ◽  
Nurse Shark ◽  
Important Species ◽  
Inaccurate Information ◽  
Management Measures ◽  
Bull Shark ◽  
Over Exploitation

The diversity of sharks occurring off the Andaman and Nicobar Archipelago in India has received increased attention in recent years. Yet, available checklists are out of date, often with inaccurate information and a number of commercially important species have not been documented through research and fish landing surveys. Here we report on shark species examined during fish landing surveys conducted from January 2017 to March 2018. Records of twelve previously unreported species from the archipelago are presented and include the bignose shark (Carcharhinusaltimus), pigeye shark (Carcharhinusamboinensis), bull shark (Carcharhinusleucas), snaggletooth shark (Hemipristiselongata), slender weasel shark (Paragaleusrandalli), Arabian smoothhound shark (Mustelusmosis), Indonesian houndshark (Hemitriakisindroyonoi), sand tiger shark (Carchariastaurus), Indonesian bambooshark (Chiloscylliumhasseltii), tawny nurse shark (Nebriusferrugineus), dwarf gulper shark (Centrophorusatromarginatus), and the Indonesian shortsnout spurdog (Squalushemipinnis). These records increase the reported shark species for the archipelago from 47 to 59 and for India from 114 to 116. Additionally, a size extension in the total length ofC.hasseltiiby 27 cm and ofP.randalliby 8 cm is reported. Owing to the bio-geographical location of these islands, species diversity around the archipelago is unique and appears to overlap with that of southeast Asia. With increasing reports of over-exploitation and the operation of a targeted shark fishery by distant water fleets in these waters, the limited information on shark diversity from this region is of concern. Systematic and long-term monitoring of catches, combined with accurate species identification, is crucial to provide information on management measures.

Life after death: behaviour of multiple shark species scavenging a whale carcass

2019 ◽  
Vol 70 (2) ◽  
pp. 302 ◽  
Author(s):  
J. S. E. Lea ◽  
R. Daly ◽  
C. Leon ◽  
C. A. K. Daly ◽  
C. R. Clarke
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Sperm Whale ◽  
Shark Species ◽  
Tiger Shark ◽  
Nurse Shark ◽  
Life After Death ◽  
Galeocerdo Cuvier ◽  
Carcharhinus Leucas ◽  
Bull Shark

A drone was used to study the richness and behaviour of scavengers attracted to the carcass of a sperm whale (Physeter microcephalus) in Seychelles, Western Indian Ocean. Over 30 sharks of 3 species (tiger shark Galeocerdo cuvier, bull shark Carcharhinus leucas and tawny nurse shark Nebrius ferrugineus) were recorded scavenging on the carcass. Tiger sharks dominated the scavenging, but with no evidence of agonistic behaviours or hierarchy, and may have facilitated scavenging by other species. Drone use allowed the analysis of such behaviours without observer influence, providing new insights into communal scavenging events.

Spatial and temporal dynamics of Pacific capelin Mallotus catervarius in the Gulf of Alaska: implications for ecosystem-based fisheries management

2020 ◽  
Vol 637 ◽  
pp. 117-140 ◽  
Author(s):  
DW McGowan ◽  
ED Goldstein ◽  
ML Arimitsu ◽  
AL Deary ◽  
O Ormseth ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Marine Ecosystem ◽  
Gulf Of Alaska ◽  
Data Series ◽  
Limited Information ◽  
Important Species ◽  
Multiple Data ◽  
Spatial And Temporal Dynamics ◽  
Spawning Areas ◽  
Spatio Temporal

Pacific capelin Mallotus catervarius are planktivorous small pelagic fish that serve an intermediate trophic role in marine food webs. Due to the lack of a directed fishery or monitoring of capelin in the Northeast Pacific, limited information is available on their distribution and abundance, and how spatio-temporal fluctuations in capelin density affect their availability as prey. To provide information on life history, spatial patterns, and population dynamics of capelin in the Gulf of Alaska (GOA), we modeled distributions of spawning habitat and larval dispersal, and synthesized spatially indexed data from multiple independent sources from 1996 to 2016. Potential capelin spawning areas were broadly distributed across the GOA. Models of larval drift show the GOA’s advective circulation patterns disperse capelin larvae over the continental shelf and upper slope, indicating potential connections between spawning areas and observed offshore distributions that are influenced by the location and timing of spawning. Spatial overlap in composite distributions of larval and age-1+ fish was used to identify core areas where capelin consistently occur and concentrate. Capelin primarily occupy shelf waters near the Kodiak Archipelago, and are patchily distributed across the GOA shelf and inshore waters. Interannual variations in abundance along with spatio-temporal differences in density indicate that the availability of capelin to predators and monitoring surveys is highly variable in the GOA. We demonstrate that the limitations of individual data series can be compensated for by integrating multiple data sources to monitor fluctuations in distributions and abundance trends of an ecologically important species across a large marine ecosystem.

scholarly journals Status stock and Sustainable Management Measures for Moroccan Sardines

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Abdelaziz Mounir ◽  
Mohammed Znari ◽  
Hayat Elmghazl ◽  
Hassan Alahyane ◽  
Noreddine Chouikh ◽  
...  
Keyword(s):  
Marine Environment ◽  
Sustainable Management ◽  
Mediterranean Region ◽  
Optimal Level ◽  
The State ◽  
Sardina Pilchardus ◽  
Sustainable Exploitation ◽  
Management Measures ◽  
Rational And Sustainable Exploitation ◽  
Over Exploitation

This article summarizes the state of stocks of sardine, sardina pilchardus in Moroccan waters at the end of 2016 and 2018. These stocks varies according to the region,They are now in a sustainable exploitation situation:Atlantic sardine, but also stocks that have reached or are still in over-exploitation levels: Mediterranean sardine. The fi shing pressure exerted on the sardine stock exceeds the optimal level by 40%. Due to the degradation of the fragile marine environment of the Mediterranean region, generated by pollution of various origins, the overexploitation of juveniles in the coastal strip, non-responsible practices and the use of non-fi shing gearselective, it is imperative to take the necessary measures to protect the marine environment and ensure rational and sustainable exploitation of the resource. (High commission plan 2006 report).

scholarly journals Sumberdaya Kuda Laut (Hippocampus spp.) di Perairan Pulau Bintan, Teluk Lampung dan Pulau Tanakeke

2019 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Masayu Rahmia Anwar Putri ◽  
Astri Suryandari ◽  
Joni Haryadi
Keyword(s):  
Marine Species ◽  
Literature Study ◽  
South Sulawesi ◽  
Lack Of Information ◽  
Management Measures ◽  
Data Deficient ◽  
Study Sites ◽  
Habitat Damage ◽  
Over Exploitation ◽  
Sexually Mature

<strong>Seahorse Resources (Hippocampus spp.) in the Waters of Bintan Island, Lampung Bay and Tanakeke Island</strong>.Information on seahorse resources is very limited, from 35 species of marine species listed on the IUCN redlist, 20 species are listed as "data deficient" which illustrates the lack of information related to sea horses, even for highly exploited species. This research was conducted to inventory sea horse resources (<em>Hippocampus</em> spp.), covering spesies information, size, sex ratio and density of seahorses from three potential locations, they are Bintan Island, Lampung and Tanakeke Island Waters. Field observation for seahorse resources was conducted at Bintan Island (Riau Islands Province) in March 2016, Lampung Bay (Lampung Province) in May 2016 and Tanakeke Islands (Takalar Regency, South Sulawesi) in June 2016 by purposive sampling method, interview with fisherman and collector and also literature study. A total of 5 seahorse species were found in three research locations, 4 species found in Bintan waters <em>(H. comes</em>, <em>H. spinossisimus</em>, <em>H. hystrix</em> and <em>H. kuda</em>), 2 species found in Lampung Bay (<em>H. comes</em> and <em>H. kuda</em>) and only 1 species found in Tanakeke (<em>H.barbouri</em>). Most of seahorse found during the study were categorized as sexually mature, dominated with seahorse 11-12 cm in size. The different types and densities of seahorses in the three study sites are supported by differences in habitat where seahorses are occupied. The density of seahorses tended to be low due to over-exploitation, environmental change and habitat damage. Management measures based on biological aspects and ecological conditions of each region need to be carried out for sustainable seahorse fisheries.

scholarly journals Prevalence of Cryptosporidium spp. in Yaks (Bos grunniens) in China: A Systematic Review and Meta-Analysis

2021 ◽  
Vol 11 ◽  
Author(s):  
Hong-Li Geng ◽  
Hong-Bo Ni ◽  
Jing-Hao Li ◽  
Jing Jiang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Economic Losses ◽  
Effective Management ◽  
Limited Information ◽  
Chinese Journal ◽  
Bos Grunniens ◽  
Knowledge Infrastructure ◽  
Management Measures ◽  
Chinese National Knowledge Infrastructure

Cryptosporidium spp., the causative agent of cryptosporidiosis, can infect a variety of hosts. So far, there has been limited information regarding Cryptosporidium spp. infection in yaks (Bos grunniens). Here, we performed the first systematic review and meta-analysis for Cryptosporidium spp. infection in yaks in China. To perform the meta-analysis, five databases (Chinese National Knowledge Infrastructure (CNKI), VIP Chinese journal database, WanFang Data, PubMed, and ScienceDirect) were employed to search for studies related to the prevalence of Cryptosporidium spp. in yaks in China. The total number of samples was 8,212, and the pooled Cryptosporidium spp. prevalence in yaks was estimated to be 10.52% (1192/8012). The prevalence of Cryptosporidium spp. in yaks was 13.54% (1029/5277) and 4.49% (148/2132) in northwestern and southwestern China, respectively. In the sampling year subgroups, the prevalence before 2012 (19.79%; 650/2662) was significantly higher than that after 2012 (6.07%; 437/4476). The prevalence of Cryptosporidium spp. in cold seasons (20.55%; 188/794) was higher than that in warm seasons (4.83%; 41/1228). In the age subgroup, the yaks with age &lt; 12 months had a higher prevalence (19.47%; 231/1761) than that in yaks with age ≥12 months (16.63%; 365/2268). Among 12 Cryptosporidium spp. species/genotypes, the C. bovis had the highest prevalence. Moreover, the effects of geography (latitude, longitude, precipitation, temperature, and altitude) and climate on Cryptosporidium spp. infection in yaks were evaluated. Through analyzing the risk factors correlated with the prevalence of Cryptosporidium spp., we recommend that effective management measures should be formulated according to the differences of different geographical factors, in order to prevent cryptosporidiosis and reduce economic losses in yaks in China.

scholarly journals The study of shark and ray abundance in Nusa Penida Aquatic Conservation Area

2019 ◽  
Author(s):  
Andhika Prima Prasetyo ◽  
Colin Simpfendorfer ◽  
Samantha Sherman ◽  
Stephen Moore
Keyword(s):  
Cost Effective ◽  
Shark Species ◽  
Limited Information ◽  
Conservation Area ◽  
Aquatic Conservation ◽  
Sea Snakes ◽  
Thresher Shark ◽  
Video Systems ◽  
Bamboo Shark ◽  
Carcharhinus Melanopterus

Limited information is one of major problem in managing shark and ray population in Indonesia. This research aims to demonstrate a cost-effective video approach to quantify the relative abundance of sharks, rays and other megafaunas (morays, turtles and sea snakes) in no-take and open access zones of Nusa Penida Aquatic Conservation Area. Using 116 deployments of baited remote underwater video systems (BRUVs) that deployed in March 2016, we found 162 individual sharks, rays and another megafauna. Three shark species from three families were identified: blacktip reef shark (Carcharhinus melanopterus, n=2), bigeye thresher shark (Alopias superciliosus, n=1) and bamboo shark (Chiloscyllium punctatum, n=10). Bamboo shark are known to have low valueto shark fisher. Five species of rays from 2 families were recorded: blue-spotted mask ray (Neotrygon kuhlii, n=12), mangrove whip ray (Himantura granulata, n=8), blue-spotted ribbon-tail ray (Taeniura lymma, n=4), blotched fantail ray (Taeniurops meyeni, n=2) and manta ray (Manta spp, n=6). We found that the zoning of the Aquatic Conservation Area had no effect on shark abundance. However, shark abundance was different between sites (East and West Nusa Penida). Numbers of lower order predators such as bamboo sharks, stingrays and morays were relatively high, potentially due to the absence of larger sharks. Rays had greater abundance at sites with low current and in deeper water, while morays, turtles and sea snakes varied across site and current intensity. Redefining zoning needed to improve benefits of spatial closure on conserving sharks, rays and another megafaunas population.

scholarly journals NEW RECORDS AND PRELIMINARY REPRODUCTIVE ASPECTS OF ELASMOBRANCHS OF THE TRINDADE-MARTIN VAZ INSULAR COMPLEX

2021 ◽  
Vol 25 (01) ◽  
pp. 159-165
Author(s):  
Thierry Salmon ◽  
Bianca de Sousa Rangel ◽  
Carlos Eduardo Malavasi-Bruno ◽  
José Roberto Kfoury-Jr
Keyword(s):  
Abundant Species ◽  
Shark Species ◽  
Tiger Shark ◽  
Blue Shark ◽  
Galeocerdo Cuvier ◽  
Shortfin Mako ◽  
New Information ◽  
Thresher Shark ◽  
Pelagic Fishing ◽  
First Time

Here we presented records of elasmobranchs obtained during a longline pelagic fishing monitoring around the Trindade-Martin Vaz insular complex, including one new record. New information on the reproductive aspects of the blue shark (Prionace glauca) and pelagic stingray (Pteroplatytrygon violacea) suggest the use of this area as mating and parturition ground for these species. The most abundant species was the P. glauca (N = 65), followed by shortfin mako shark Isurus oxyrinchus (N = 12). We also recorded for the first time the smooth hammerhead shark Sphyrna zygaena (N = 3) and the bigeye thresher shark Alopias superciliosus (N = 2), and other shark species previous reported for the insular complex, including the oceanic whitetip Carcharhinus longimanus (N = 2), and the tiger shark Galeocerdo cuvier (N = 1). Our findings highlight the importance of further studies at the Trindade-Martin Vaz insular complex considering the pelagic biodiversity and reproductive aspects of elasmobranchs.

scholarly journals Negative allometric growth during ontogeny in the large pelagic filter-feeding basking shark

Zoomorphology ◽  
2019 ◽  
Vol 139 (1) ◽  
pp. 71-83
Author(s):  
Harald Ahnelt ◽  
Michael Sauberer ◽  
David Ramler ◽  
Laura Koch ◽  
Claudia Pogoreutz
Keyword(s):  
Valuable Insight ◽  
Shark Species ◽  
Tiger Shark ◽  
Large Species ◽  
Allometric Growth ◽  
Filter Feeding ◽  
Long Distance ◽  
Caudal Fin ◽  
Swimming Mode ◽  
Basking Shark

Abstract Many pelagic shark species change body and fin shape isometrically or by positive allometry during ontogeny. But some large apex predators such as the white shark Carcharodon carcharias or the tiger shark Galeocerdo cuvier show distinct negative allometry, especially in traits related to feeding (head) or propulsion (caudal fin). In particular, changes in propulsion are attributed to a shift in swimming mode. The more heterocercal caudal fin of younger individuals with its large caudal fin span seemingly aids in hunting small, agile prey. In contrast, the less heterocercal caudal fin with a larger fin area in larger individuals aids a long-distance slow swimming mode. We were interested if negative allometric effects can be observed in a planktivorous shark, the basking shark Cetorhinus maximus, a large species adapted to long-distance slow swimming. To address this question, we compared three size classes, specifically < 260 cm (juveniles), 299–490 cm (subadults), and from adults > 541 cm total length. Comparing literature data, we found negative allometric growth of the head and of the caudal fin, but a more rapid decrease of relative caudal fin size than of relative head length. Hereby, we provide the first evidence for early negative allometric growth of the caudal fin in a large pelagic filter-feeding shark. Our study further demonstrates that ecomorphological approaches may add valuable insight into the life history of animals that are challenging to study in their natural habitat, including large roving sharks such as the basking shark.

Sustainability of Agriculture Systems: A Case Study of Punjab

2020 ◽  
pp. 225-231
Keyword(s):  
Farmyard Manure ◽  
Sustainable Growth ◽  
Groundwater Depletion ◽  
Management Approach ◽  
Cropping Pattern ◽  
Management Measures ◽  
Input Use ◽  
Agronomic Management ◽  
Tube Wells ◽  
Over Exploitation

Punjab agriculture is a fitting example of intensive cultivation with the dominance of rice-wheat monoculture. The state of Punjab has one of the highest cropping intensity, irrigated area and exhaustive input use. The monoculture of wheat and paddy led to widening the gap of sustainable growth of agriculture over the time. It would lead to groundwater depletion, declining of water table level and over-exploitation of tube wells and submersible pump. The present study was conducted to examine the sustainability of agriculture system in Punjab. It was found that there is need of proper utilization of available scares water resources or use of organic sources that is, farmyard manure, compost, and green manure in order to reduce the problem of groundwater depletion or impact of chemical fertilizers on soil fertility. The results revealed that there is a need to practice crop management measures, that is, crop rotation which should help in controlling field from pest and disease. The farm management approach like appropriate cropping pattern, packages of advanced farm technology etc. and agronomic management approach like bi-directional sowing, intercropping, minimum tillage, etc. should be encouraged. It will not only help in sustaining and stabilizing the production but also increases the profitability of crops.

scholarly journals Diet of the bull shark, Carcharhinus leucas, and the tiger shark,Galeocerdo cuvier, in the eastern Pacific Ocean

2017 ◽  
Vol 41 ◽  
pp. 1111-1117 ◽  
Author(s):  
Colombo ESTUPIÑÁN-MONTAÑO ◽  
José Félix ESTUPIÑÁN-ORTIZ ◽  
Luis Germán CEDEÑO-FIGUEROA ◽  
Felipe GALVÁN-MAGAÑA ◽  
Carlos Julio POLO-SILVA
Keyword(s):  
Pacific Ocean ◽  
Eastern Pacific ◽  
Tiger Shark ◽  
Eastern Pacific Ocean ◽  
Galeocerdo Cuvier ◽  
Carcharhinus Leucas ◽  
Bull Shark
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