scholarly journals Molecular detection of giant snakeheads, Channa micropeltes (Cuvier, 1831), one of the most troublesome fish species

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maslin Osathanunkul ◽  
Toshifumi Minamoto
Keyword(s):  
Fish Species ◽  
Water Samples ◽  
Fishery Management ◽  
Survey Methods ◽  
Current Method ◽  
Negative Effects ◽  
Predator Prey ◽  
Commercially Important ◽  
Distribution Of Fish ◽  
A Current

AbstractA lack of reliable tools for determining the presence and distribution of fish species can impede understanding of predator–prey interactions and fishery management. Conventional fish survey methods are invasive, and can be size or species selective. Combining netting and electrofishing is a current method used to monitor fish species in Phayao Lake (Kwan Phayao), Thailand. However, the methods are inefficient and time-consuming. Recently, locals who rely on inland fisheries in Kwan Phayao expressed their deep concerns about the giant snakehead, Channa micropeltes (Cuvier, 1831) destroying other fish there. The giant snakehead prey on many commercially important fish species, as the prey species is reduced, negative effects on both biodiversity and the fishery sector could follow. Here, an eDNA-based survey was developed to detect the presence of the giant snakehead. Water samples were collected from six sites within Kwan Phayao and 17 sites in Ing River where water flowed into and out of Kwan Payao. The eDNA of the giant snakehead was detected in water samples from all collection sites using the developed qPCR assay with various concentrations. The eDNA was shown here to be a sensitive and reliable tool for fish surveillance so there will be a better chance for developing an effective management strategy.

scholarly journals KARAKTERISTIKHABITATDANSEBARAN JENIS IKAN DI SUNGAIKAPUAS BAGIAN TENGAHDANHILIR

2017 ◽  
Vol 3 (5) ◽  
pp. 277
Author(s):  
Susilo Adjie ◽  
Agus Djoko Utomo
Keyword(s):  
Public Health ◽  
Water Quality ◽  
Fish Species ◽  
Water Samples ◽  
Flood Plain ◽  
Habitat Characteristics ◽  
American Public Health Association ◽  
Conservation Area ◽  
Health Association ◽  
Distribution Of Fish

Sungai Kapuas memiliki keanekaragaman jenis ikan yang tinggi dilaporkan mencapai sekitar 200 spesies. Penelitian ini bertujuan untuk mengetahui karakteristik habitat serta sebaran jenis ikan di Sungai Kapuas bagian tengah dan hilir. Penelitian ini dilakukan pada bulan April, Juli, September, dan Nopember 2006. Parameter yang diamati meliputi kualitas air (suhu, kecerahan, daya hantar listrik, pH, CO2, oksigen terlarut, alkalinitas, BOD, PPO 4, N-NO3, N-NO2, COD, N-NH3, dan salinitas), habitat perairan, serta sebaran jenis ikan. Contoh air diambil dari sembilan stasiun pengamatan yaitu di bagian tengah Tengkidap, Pengembung, Pemerak, Bukit Tekenang, dan Sambar Indah dan di bagian hilir Muara Jungkat, Sungai Raya, Muara Sungai Tayan, dan Semitau, contoh air dianalisis menggunakan American Public Health Association (1986). Hasil pengamatan menunjukkan bahwa karakteristik kualitas air bagian tengah dan hilir relatif sama dan karakteristik habitat Sungai Kapuas bagian tengah merupakan daerah rawa banjiran (flood plain) yang banyak terdapat hutan rawa danmerupakan kawasan konservasi dari Taman Nasional Danau Sentarum. Karakteristik habitat Sungai Kapuas bagian hilir dipengaruhi oleh pasang surut air laut dan merupakan kawasan industri. Jenis ikan yang dijumpai di sepanjang stasiun pengamatan terdapatsekitar 123 jenis, penyebarannya terkonsentrasi di sungai bagian tengah ± 120 jenis yang didominansi oleh ikan Cyprinidae dan Sungai Kapuas bagian hilir ±85 jenis yang didominansi oleh ikan dukang (Arius stomi) dan janggut(Polynemus longipectoralis). Kapuas River has a high diversity of fish species reported to reach about 200 species. This study aimed to characterize the habitat and distribution of fish species in the Kapuas River middle and downstream sections. The study was conducted in April, July, September, and November 2006. The parameters observed included water quality (temperature, brightness, electrical conductivity, pH, CO2, dissolved oxygen, alkalinity, BOD, P-PO4, NNO3, N-NO2, COD, NH3-N, and salinity), and aquatic habitats distribution of fish species. Water samples taken from nine observation stations are in the middle Tengkidap, Pengembung, Pemerak, Bukit Tekenang, and Sambar Indah and in the downstream Muara Jungkat, Sungai Raya, Muara Sungai Tayan, and Semitau, water samples were analyzed using the American Public Health Association (1986). The results showed that characteristics of water quality downstream of the middle and relatively similar, habitat characteristics of the Kapuas River and the middle is a swamp area flood plain that there are still a lot of swamp forest and is a conservation area of the Park Lake Sentarum. Characteristics of the Kapuas River downstream habitats are influenced by tides and is an industrial area. Types of fish that are found along the observation stations are about 123 species, its distribution is concentrated at the center of the ± 120 River dominated by fish species cyprinidae and Kapuas River downstream of ± 85 species dominated by fish dukang (Arius stomi) and janggut (Polynemus longipectoralis).

Diversity and abundance of cichlids in Ikere Gorge Reservoir, Iseyin, Oyo State, Nigeria

2021 ◽  
Vol 18 (1) ◽  
pp. 52-56
Author(s):  
S.O. Ajagbe ◽  
R.O. Ajagbe ◽  
O.S. Ariwoola ◽  
F.I. Abdulazeez ◽  
O.O. Oyewole ◽  
...  
Keyword(s):  
Fish Species ◽  
Riparian Forest ◽  
Abundant Species ◽  
Freshwater Ecosystems ◽  
Freshwater Species ◽  
Fishing Villages ◽  
Gorge Reservoir ◽  
Commercially Important ◽  
Sarotherodon Galilaeus ◽  
Fish Species Diversity

Cichlids are highly abundant and commercially important fish in freshwater ecosystems in Nigeria. This study examined the diversity and abundance of cichlids in Ikere Gorge Reservoir. Four fishing villages were randomly selected from 12 fishing villages in Ikere Gorge Reservoir as sampling sites. Cichlids were sampled randomly and examined from fishermen catch in each selected fishing village; were identified with appropriate keys; the weight and abundance of the catches were recorded. The data obtained was subjected to descriptive statistical analysis using SPSS (Version 20.0) software to determine the abundance of fish species. Fish species diversity was carried out by using Palaeontological Statistics (PAST). Eight species of cichlids were sampled in Ikere Gorge but Sarotherodon galilaeus was the most abundant species while the least abundant species was Pelmatolapia mariae. It was observed that, cichlids were  abundant in rainy season than in the dry season. Likewise, cichlids were abundant in Ikere-gorge reservoir but they have low diversity. This may be as a result of unsustainable fishing pressure and deforestation of riparian forest and sedimentation in Ikere-gorge reservoir. Therefore, to maintain sustainable fishing activities and improve cichlids population in Ikeregorge reservoir, unsustainable activities in and around Ikere Gorge reservoir should be put under control. Keywords: Cichlidae; freshwater species; dominant; Sarotherodon galilaeus; Pelmatolapia mariae.

scholarly journals The contribution of environmental factors to fish assemblages in the Río Acahuapa, a small drainage in Central America

2017 ◽  
Vol 15 (3) ◽  
Author(s):  
Francisco S. Álvarez ◽  
Wilfredo A. Matamoros ◽  
Francisco A. Chicas
Keyword(s):  
Fish Species ◽  
Habitat Structure ◽  
Fish Assemblages ◽  
Species Abundance ◽  
Main Channel ◽  
Estuarine Fish ◽  
Species Origin ◽  
High Temperature Water ◽  
Distribution Of Fish ◽  
Temperature Water

ABSTRACT The ichthyofauna of the Río Acahuapa was analyzed sampling 17 sites that included the basin main channel and its tributaries. Fish were collected using dip-nets, seine-nets and electrofishing. Fish standard length and species abundance were recorded. Species origin and salinity tolerance criteria were used to classify fish species. Water physicochemical variables, habitat structure and sampling sites elevation were recorded. A total of 33 fish species were registered, 12.1% are primary, 45.5% are secondary and 42.4% are of marine derivation. Fish species richness declined with increase of elevation (R2=0.55, p=0.0006). Two assemblages of fishes were identified: the first one associated to sites of low elevations (19-184 masl), composed mainly of secondary and marine-estuarine fish species related with high temperature, water velocity, river width, dissolved oxygen and low sand and silt substrate cover; the second one associated to sites of middle and higher elevations (185-519 masl), composed by primary and secondary freshwater fishes related with high pH, logs and rocks substrate cover. In summary, elevation and environmental variables contributed to the composition and distribution of fish in the Río Acahuapa.

scholarly journals Effects of climate change in the seas of China: Predicted changes in the distribution of fish species and diversity

2022 ◽  
Vol 134 ◽  
pp. 108489
Author(s):  
Wenjia Hu ◽  
Jianguo Du ◽  
Shangke Su ◽  
Hongjian Tan ◽  
Wen Yang ◽  
...  
Keyword(s):  
Climate Change ◽  
Fish Species ◽  
Distribution Of Fish

scholarly journals Terrestrial mammal diversity in forests close to pineapple crops, Cutris San Carlos, Costa Rica.

2015 ◽  
Vol 7 (1) ◽  
pp. 59-65
Author(s):  
Jonathan Navarro P ◽  
Alexander Gómez L
Keyword(s):  
Conservation Status ◽  
Forest Fragments ◽  
Negative Effects ◽  
Forest Patches ◽  
Wild Mammals ◽  
Predator Prey ◽  
Terrestrial Mammal ◽  
Terrestrial Mammals ◽  
San Carlos ◽  
Mammal Diversity

Pineapple crops reduce the size of forest fragments and generate pressure on biodiversity in the remnants. To determine potential negative effects of forest fragmentation we assessed diversity and composition of terrestrial mammals in forest patches on three farms under pineapple crops. We placedSherman and Tomahawk traps, footprints traps near water bodies, and made daily tracks to obtain traces and direct observation of mammals. We identified seven species of wild mammals, mostly omnivorous and under a least concern conservation status. The effect of cover type generated by the pineapple crops is consistent with mammal composition. Pineapple crops could enhance the most common wildlife problems, such as predator-prey relationships. Therefore, pineapple plantations, by causing fragmentation and lack of connectivity among forest patches, threaten extinction of mammals in some of their original range.

scholarly journals Keanekaragaman Jenis Ikan di Hilir Sungai Sekadau Kalimantan Barat

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Kristoforus Slamet Suryadi Junardi, Tri Rima Setyawati
Keyword(s):  
Data Collection ◽  
Fish Species ◽  
Environmental Conditions ◽  
West Kalimantan ◽  
Gill Net ◽  
Distribution Of Fish

Diversity of fish species is important  known to determinate river. The purpose of this study was to determine the diversity and distribution of fish also environmental conditions in the lower reaches of the Sekadau River, West Kalimantan. Data collection is conducted from March to May 2018 using posat and gill net. The results showed that the most common Cyprinidae family was found in Rasbora argyrotaenia  and Osteochilus microcephalus with dominance value  0.72 and 0.70 respectively.

scholarly journals Stomach Content of Tillapia zilli and Oreochromis nilocticus from Wanzun River, Lavun Local Government, Niger State Nigeria

2021 ◽  
pp. 15-20
Author(s):  
Y. M. Mohammed ◽  
M. D. Abubakar ◽  
A. M. Muhammad ◽  
A. S. Muhammad ◽  
B. L. Umar ◽  
...  
Keyword(s):  
Fish Species ◽  
Stomach Content ◽  
Stomach Contents ◽  
Empty Stomach ◽  
Plant Materials ◽  
Individual Fish ◽  
Fish Samples ◽  
Commercially Important ◽  
Fish Remains ◽  
The One

This study was conducted to investigate the stomach contents of two commercially important fish species (Tilapia zilli and Oreochromis nilocticus)  from Wanzun River, Northcentral Nigeria using frequency of occurrence and volumetric methods between January to April 2019. Fish samples were collected monthly with help of Fishermen using various fishing nets and traps. One hundred (100) individual fish of each species were collected and their stomach contents were examined. The results obtained expressed in mean percentage indicated that out of the one hundred (100) individual fish of each species examined,Twelve (12%) fish had an empty stomach contents in Tilapia zilli, and out of the 100 samples examined, Seventeen (17%) fish had an empty stomach content in Oreochromis nilocticus. The stomach contents of both Tilapia zilli and Oreochromis nilocticus consist of detritus, insects, fish remains. Algae/protozoans plant materials and molluscs. Both fish species are omnivorous feeders and occupy the same ecological niche.The study reveals the importance of algae, fish, insects and plant materials as food for fishes and they form important part in the diet of the species examined.

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