scholarly journals Changes in Pelagic Fish Community Composition, Abundance, and Biomass along a Productivity Gradient in Subtropical Lakes

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 858
Author(s):  
Jinlei Yu ◽  
Wei Zhen ◽  
Lingyang Kong ◽  
Hu He ◽  
Yongdong Zhang ◽  
...  
Keyword(s):  
Fish Species ◽  
Fish Community ◽  
Yangtze River Basin ◽  
Small Fish ◽  
Fish Community Structure ◽  
Catch Per Unit Effort ◽  
Subtropical Lakes ◽  
Fish Catch ◽  
Total Fish ◽  
The Yangtze River Basin

How fish communities change with eutrophication in temperate lakes is well documented, while only a few studies are available from subtropical lakes. We investigate the fish community structure in 36 lakes located in the Yangtze River basin, covering a wide nutrient gradient. We found that fish species richness and total fish catch per unit effort (CPUE) increased significantly with chlorophyll a (Chla). Among the different feeding types, the proportion of zooplanktivores increased significantly with Chla, while the percentage of omnibenthivores showed no obvious changes; the CPUE of piscivorous Culter spp. increased with Chla, while their proportion of total catch decreased pronouncedly. Based on the index of relative importance (IRI), the most important and dominant fish species was the zooplanktivorous Sijiao (Toxabramis swinhonis), followed by the omniplanktivorous sharpbelly (Hemiculter leucisculus) and the omnibenthivorous crucian carp (Carassius carassius), a small-sized species belonging to the Cyprinidae family. The CPUE of these three species increased significantly with Chla. The focus has, so far, been directed at large fish, but as emphasized by our results, the abundant small fish species were dominant in our subtropical study lakes even in terms of biomass, and, accordingly, we recommend that more attention be paid to the population dynamics of these species in the future.

Characterizing north temperate lake littoral fish assemblages: a comparison between distance sampling and minnow traps

2006 ◽  
Vol 63 (3) ◽  
pp. 558-568 ◽  
Author(s):  
Pamela SD MacRae ◽  
Donald A Jackson
Keyword(s):  
Community Structure ◽  
Fish Species ◽  
Fish Community ◽  
Sampling Method ◽  
Distance Sampling ◽  
Line Transect ◽  
Small Fish ◽  
Fish Community Structure ◽  
Temperate Lakes ◽  
North Temperate Lakes

To determine which sampling method may be best employed to monitor changes in fish species composition in littoral areas of small north temperate lakes (≤50 ha), data were collected using distance sampling, based on the line transect method, and a traditional fish sampling method of baited minnow traps. These methods were independently biased in terms of their estimates of species presence and abundance. However, analyses of fish community structure indicated that minnow trap data alone provided a better measure of community structure than did distance sampling data alone. Distance sampling, although a powerful tool in estimating population density, is hindered by a multitude of environmental variables that do not preclude the use of minnow traps. Lakes with clear water containing few species with abundant individuals are best suited for distance sampling. Minnow traps proved to be a fast, efficacious sampling method capable of fairly accurately defining the littoral small-fish community structure in most lakes sampled. These traps are a reliable method for monitoring presence or absence and relative abundance of small-bodied fish species in north temperate lakes. However, the combination of minnow traps and some form of visual sampling will help to ensure that all species are detected in small north temperate lakes.

scholarly journals Spatial and temporal changes in fish yields and fish communities in the largest tropical floodplain lake in Asia

2017 ◽  
Vol 53 ◽  
pp. 485-493 ◽  
Author(s):  
Bunyeth Chan ◽  
Peng Bun Ngor ◽  
Nam So ◽  
Sovan Lek
Keyword(s):  
Functional Groups ◽  
Fish Species ◽  
Temporal Changes ◽  
Pangasianodon Hypophthalmus ◽  
Tonle Sap ◽  
Commercial Species ◽  
Fish Catch ◽  
Total Fish ◽  
Spatio Temporal ◽  
Fish Yields

Although the Tonle Sap Lake is the largest natural inland lake in Southeast Asia, little is known about the spatio-temporal patterns of its composition and yields. The present paper aimed to investigate the temporal change of yields of the most dominant fish species and to evaluate the spatio-temporal changes in the fish community and the indicator species of assemblages. Fish catch data were collected from thirty-three fishing lots around the lake during the open season from October to May each year between 1994 and 2000. The fish yields were dominated by few commercial fishes: Channa micropeltes, Pangasianodon hypophthalmus, Channa striata, Cyclocheilichthys enoplos, Henicorhynchus spp., Barbonymus gonionotus, Micronema spp. and Trichopodus microlepis. The standard linear regression coefficients of the fish yields versus year were negative for all these commercial species except T. microlepis. Moreover, the total fish yields of the lake were temporally declined (standard coefficient = −2.410, adjusted r2 = 0.272). Nonmetric multidimensional scaling of the fish assemblage data showed a clear opposition between northern assemblage and southern assemblage along the first axis, and the temporal pattern of the samples from 1994 to 1999 was explained by the second axis. The fish species assemblage from earlier years (1994 and 1995) was characterised by the abundance of all functional groups of black-white-grey fish species, but more recent years (1996–1999) were linked to white and grey functional groups, which was explained by a decrease in many black fishes.

scholarly journals STRUKTUR KOMUNITAS IKAN DAN TINGKAT TROFIK DI WILAYAH GENANGAN WADUK JATIGEDE PRAINUNDASI, KABUPATEN SUMEDANG-JAWA BARAT

2016 ◽  
Vol 8 (1) ◽  
pp. 29
Author(s):  
Andri Warsa ◽  
Kadarwan Soewardi ◽  
Sigid Hariyadi
Keyword(s):  
Community Structure ◽  
Digestive Tract ◽  
Surface Area ◽  
Fish Species ◽  
Trophic Level ◽  
Food Habits ◽  
Fish Community ◽  
Fish Sample ◽  
Fish Community Structure

<p>Waduk Jatigede dibangun dengan membendung Sungai Cimanuk dan  memiliki luas 4.122 ha serta merupakan waduk multifungsi. Tujuan penelitian ini adalah untuk mengetahui struktur komunitas ikan dan pemanfaatan sumber daya makanan oleh beberapa jenis ikan yang terdapat di DAS Cimanuk wilayah genangan Waduk Jatigede pra inundasi. Penelitian dilakukan setiap bulan pada Februari-Mei 2015 setiap bulan pada minggu pertama. Sampel ikan diperoleh dengan menggunakan jaring insang, jala, dan pancing. Percobaan penangkapan dilakukan di Sungai Cialing (inlet), Genteng, Cimanuk dan Cinambo (outlet). Ikan yang tertangkap dipisahkan berdasarkan jenisnya dan diukur panjang total serta ditimbang bobotnya. Untuk analisis kebiasaan makan kebiasaan makan, saluran pencernaan diambil dan diawetkan dengan formalin 4%. Untuk identifikasi contoh ikan diawetkan dengan formalin 10%. Ikan yang tertangkap selama penelitian sebanyak 11 jenis. Ikan yang dominan adalah lalawak dan genggehek<em>. </em>Rasio biomassa-kelimpahan ikan menujukkan bahwa komunitas ikan di Waduk Jatigede sebelum penggenangan dalam kondisi terganggu. Jenis makanan alami yang dimanfaatkan oleh komunitas ikan di Sungai Cimanuk wilayah genangan Waduk Jatigede adalah detritus, krustase, annelida, insekta, moluska, tumbuhan dan fitoplankton.</p><p><strong> </strong></p><p><em>Jatigede Reservoir  was build with damming of Cimanuk River has about  4.122 ha surface area as wel as multi purpose reservoir. The aim of the research is to known the fish community structure and trophic level by fishes community at Cimanuk River arround Jatigede Reservoir pre inudated. The research was carried out in February-May 2015. Fish sample was obtained by using gillnet, hook and cast net. The experimental fishings were setting at Cialing</em> (<em>inlet</em>), <em>Genteng</em>, <em>Cimanuk and Cinambo</em> (<em>outlet</em>).<em> Fish sample were separated according speciesand was measured of total lenght. To the analisys of food habits, digestive tract was preserved using formalin 4%. For identification, fish sample  was preserved using formalin 10%. About 11 fish species were recorded. Dominan fish catches were Barbonymus balleroides and Mystacoleucus marginatus. According to Abundance-Biomass Comparisson, fish community was under pressure (unstable). Natural feeds observed were detritus, crustacea, annelida, insecta, molusca, plant and phytoplankton. </em></p>

scholarly journals REEF FISHES BIODIVERSITY IN MARINE SANCTUARY AT MINAHASA UTARA DISTRICT, NORTH SULAWESI

2016 ◽  
Vol 8 (1) ◽  
Author(s):  
Fakhrizal Setiawan ◽  
Sonny Tasidjawa ◽  
Efra Wantah ◽  
Hendri Johanis
Keyword(s):  
Reef Fish ◽  
Fish Species ◽  
Fish Community ◽  
Coral Cover ◽  
Good Condition ◽  
Reef Fishes ◽  
Fish Community Structure ◽  
North Sulawesi ◽  
Reef Fish Community ◽  
Reef Fish Species

<p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>There are </em><em>some marine sanctuaries (DPL) which are managed together by its societies in North Minahasa regency. From 19 villages with DPL, we conducted surveys using point intercept transect in 14 villages both inside and outside DPL in the subdistrict West Likupang and East Likupang, North Minahasa. Result showed that l</em><em>ive coral cover was in general in moderate to excellent conditions both inside and outside DPL. Reef fish recorded in the study areas consisted of 267 reef fish species which categorized into 40 families. Bahoi village had the highest abundance and biomass within the DPL due to a very good condition of coral reef ecosystemn (&gt;75% coral cover) both inside and outside DPL. Biomass of reef fish outside DPL of Bahoi was small but its abundance was the highest. This conditions indicated that the size of reef fish outside of Bahoi DPL was small and this gave a positive perspective to supply fishes into the outside region of Bahoi DPL. Overall, marine sanctuary in North Minahasa contained reef fish community structure in good condition, moderate diversity, relatively labile of evenness index, and low dominance. </em><em>Grouping</em><em> by similarity, reef fish species were generally similar in all locations. The separation of DPL locations produced some different fishes group due to its different location, oceanographic conditions, and characters.</em><em></em></p><p> </p><p><strong><em>Keywords</em></strong><em>: Marine sanctuary, reef fish community, North Minahasa.</em></p>

scholarly journals The impact of climate change on the fish community structure of the eastern continental shelf of the Bay of Biscay

2005 ◽  
Vol 62 (7) ◽  
pp. 1436-1443 ◽  
Author(s):  
Jean-Charles Poulard ◽  
Fabian Blanchard
Keyword(s):  
Continental Shelf ◽  
Fish Species ◽  
Fish Community ◽  
Large Scale ◽  
Temporal Trends ◽  
Distribution Range ◽  
Bay Of Biscay ◽  
Fish Community Structure ◽  
Abundance Indices ◽  
The Impact

Abstract Many fish species are at the southern or northern limit of their distribution range in the Bay of Biscay, where large-scale hydroclimatic changes have occurred in recent decades. We attempt here to identify the impact of these changes on the fish community of the eastern continental shelf of the Bay of Biscay. Data collected during 14 autumn groundfish surveys in 1973 and from 1987 to 2002 are used. The study area is between latitudes 48°30′N and 43°30′N while the depth ranges from 15 to 200 m. Annual abundance indices (number of individuals per km2) of 56 fish taxa present on average in at least 5% of the tows are computed. Multivariate analysis is used to detect temporal trends in these species' abundance indices. Assuming that increased water temperature may favour subtropical species and hinder temperate ones, knowledge about the latitudinal distribution range is used to interpret time trends. Results show an increasing abundance trend with time for fish species having a wide distribution range in latitude (mainly subtropical ones), whereas the abundance of temperate and the least widely distributed species decreased steadily.

scholarly journals Comparison of catching efficiency of two Indonesian traditional traps, Ayunan and Tamba

2014 ◽  
Vol 2 (2) ◽  
pp. 113
Author(s):  
. Ahmadi ◽  
Muhammad Arief Yanuar Rachman ◽  
. Irhamsyah ◽  
Saaluddin Husin
Keyword(s):  
Fish Species ◽  
Total Weight ◽  
Catch Per Unit Effort ◽  
Large Variability ◽  
Unit Effort ◽  
Baited Traps ◽  
Fish Catch ◽  
Macrognathus Aculeatus

The catching efficiency of traditional traps: Ayunan and Tamba were tested in Sungai Batang River, South Kalimantan of Indonesia. Trials consisted of 320-trap hauls/type using 1-day submersion time of 24 hr. The baited traps sampling accounted for 82 specimens assigned to 5 species of 5 families. There was a large variability in number of catch between prawns and fish species collected (T=2.318, P<0.05). The prawns catch was represented by only the species Macrobrachium rossenbergii with total of 53 and 1,015 g weight. The prawns weight of Tamba was significantly higher than that of Ayunan (T=3.453, P<0.01).The fish catch composed of Mystus gulio 79%, Osteochilus hasselti 10%, Hypostomus plecostomus 7%, and Macrognathus aculeatus 3%, with total weight ranged from 35 to 560 g. A clear difference was found in catching efficiency. Comparative fishing trials showed that Tamba collected specimens were 1.8 times higher than Ayunan (T=2.223, P<0.05). Catch per unit effort for Tamba ranged from 58.13 to 80.00, and for Ayunan ranged from 5.31 to 7.19. The gear modifications and various treatments (e.g. bait odor, light) are necessary to be taken to increase their relative catching efficiency.

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