Fish Community Structure, Biomass, and Production in the Turkey Lakes Watershed, Ontario

The Turkey Lakes Watershed contains four lakes, and the headwater lake (Batchawana Lake) consists of two distinct basins, neither of which supports a native, reproducing fish stock. Fish biomass varied by a factor of 3.3 among the other three lakes in the watershed. Fish flesh production varied by a factor of only 1.5 in the system. Salmonid and small cyprinid contribution to biomass and production increased with progression downstream. Both fish biomass and production per unit surface area decreased with increasing lake depth. The fish biomass and production in the watershed was strongly influenced by depth, but alkalinity and phytoplankton carbon assimilation also were related to stock and production. Wishart Lake, immediately below Batchawana Lake, has a fish stock with restricted recruitment, and cyprinids make only a limited contribution to the observed production. Although both these conditions may be symptomatic of lake acidification, it is unclear whether the situation in this watershed results from lake acidification or biogeographic factors.

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Particulate Organic Carbon Supply and Trophic Dynamics in a Mississippi Flood-Control Reservoir Dominated by Gizzard Shad (Dorosoma cepedianum)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f92-191 ◽

1992 ◽

Vol 49 (8) ◽

pp. 1722-1733 ◽

Cited By ~ 7

Author(s):

Nicholas G. Aumen ◽

Cindy L. Crist ◽

Dawn E. Miller ◽

Keith O. Meals

Keyword(s):

Organic Carbon ◽

Particulate Organic Carbon ◽

Fish Community ◽

Flood Control ◽

Gizzard Shad ◽

Forage Fish ◽

Fish Biomass ◽

Dorosoma Cepedianum ◽

Fish Community Structure ◽

Phytoplankton Primary Production

Sources of particulate organic carbon (POC) and trophic–dynamic relationships were studied in a reservoir with low sportfish populations. Fish community structure and POC input from tributaries, phytoplankton primary production, and vascular vegetation on mudflats were estimated. Gizzard shad (Dorosoma cepedianum) averaged 39.8% of the total fish biomass in 1988, and as much as 94% of the total forage fish biomass was too large to serve as prey for most predators. Phytoplankton primary productivity averaged 1182 mg C∙m−2∙d−1 in 1987 and 1988, contributed 33.57 Gg POC∙yr−1 to the reservoir, and apparently was phosphate limited. POC inflow from tributaries contributed 60.00 Gg∙yr−1with 79% of POC <75 μm in size. Winter and spring stormflow was responsible for 92% of the total POC transported. Considering POC size fractions available to gizzard shad, POC input from tributaries, phytoplankton, and mudflats contributed 21, 54, and 25% of the total POC input, respectively. The trophic–dynamic analysis indicated that phytoplankton POC was adequate to support the reservoir fish community. A more efficient transfer of carbon in the food web might be accomplished by stocking with a smaller forage fish, such as threadfin shad (Dorosoma petenense), which are not common in the reservoir.

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Assessment of fish community structure along the Jakarta Bay–Pulau Seribu reef complex

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315418000152 ◽

2018 ◽

Vol 99 (2) ◽

pp. 503-516

Author(s):

A.R.M. Polónia ◽

D.F.R. Cleary ◽

A.A. Duine ◽

J. Van Dijk ◽

N.J. De Voogd

Keyword(s):

Remote Sensing ◽

Water Quality ◽

Community Structure ◽

Fish Community ◽

Remotely Sensed ◽

Fish Biomass ◽

Fish Community Structure ◽

Remotely Sensed Data ◽

Poor Water Quality ◽

Reef Degradation

Coastal ecosystems have been increasingly subjected to poor water quality. Remote sensing has been used to monitor water quality, but few studies have integrated remotely sensed data with compositional and/or abundance data of coral reef taxa. In the present study, fish biomass was assessed along the Jakarta Bay Thousand Island reef system and variation in the biomass of selected fish families related to substrate cover and remotely sensed data. Overall, fish biomass and the biomass of each of the families Acanthuridae, Apogonidae, Caesionidae, Chaetodontidae, Ephippidae, Pomacentridae, Labridae and the subfamily Scaridae were much higher mid- and offshore than inshore. Substrate cover and chlorophyll-a concentrations proved to be significant predictors of spatial variation in fish biomass, suggesting an important impact of reef degradation and eutrophication on reef fish abundance.

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Testing candidate indicators to support ecosystem-based management: the power of monitoring surveys to detect temporal trends in fish community metrics

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2003.09.004 ◽

2004 ◽

Vol 61 (1) ◽

pp. 35-42 ◽

Cited By ~ 107

Author(s):

Mike D Nicholson ◽

Simon Jennings

Keyword(s):

Community Structure ◽

Time Scales ◽

Fish Community ◽

Temporal Trends ◽

Fish Stock ◽

Trawl Survey ◽

Fish Community Structure ◽

Ecosystem Based Management ◽

Community Metrics ◽

Fish Community Metrics

Abstract Community metrics describe aspects of community structure and are often calculated from species-size-abundance data collected during fish stock monitoring surveys. Several community metrics have been proposed as indicators to support ecosystem-based fishery management. These metrics should be sensitive to fishing impacts and respond rapidly to management action, so that managers can assess whether changes in the fish community are a desirable or undesirable response to management. It should also be possible to estimate metrics with sufficient precision so that changes in the community can be detected on management time scales of a year to a few years. Here, we test the power of a large-scale annual trawl survey (North Sea International Bottom Trawl Survey, IBTS) to detect trends in six community metrics: mean length, mean weight, mean maximum length, mean maximum weight, slope of the biomass size spectrum, and mean trophic level. Our analyses show that the power of the trawl survey to detect trends is generally poor. While community metrics do provide good long-term indicators of changes in fish community structure, they are unlikely to provide an appropriate tool to support short-term management decisions. If fish community metrics are to provide effective support for ecosystem-based management, and management time scales cannot be extended, then the power of many surveys to detect trends in fish community structure will need to be improved by increased replication and standardization.

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Responses of the fish community in a eutrophicated lake to long-term food web management assessed by multiple sampling methods

Hydrobiologia ◽

10.1007/s10750-020-04243-9 ◽

2020 ◽

Vol 847 (21) ◽

pp. 4559-4573 ◽

Cited By ~ 2

Author(s):

Martti Rask ◽

Tommi Malinen ◽

Mikko Olin ◽

Heikki Peltonen ◽

Jukka Ruuhijärvi ◽

...

Keyword(s):

Food Web ◽

Fish Community ◽

Population Analysis ◽

Abundant Species ◽

Fish Growth ◽

Fish Biomass ◽

Fish Community Structure ◽

Web Management ◽

White Bream

AbstractFish community responses to long-term mass removal of planktivorous fish from eutrophicated Lake Tuusulanjärvi were examined during 1996–2018 by gill net test fishing, hydroacoustics with simultaneous trawling, virtual population analysis (VPA) and fish growth measurements. The gillnet catches of white bream and roach increased first while bream and bleak decreased but recovered in the early 2000s. Perch and pikeperch increased but ruffe decreased and remained low. According to hydroacoustics, pelagic fish biomass decreased. Smelt was the most abundant species at the beginning and the end of the monitoring period but bream dominated the fish biomass in most years. VPA calculations indicated a five- and threefold increase in the biomass of bream and white bream, respectively, during 2005–2011. Significant increases appeared in the growth of perch, bream and roach. Overall, the responses in the fish community structure and fish abundance to the food web management were slight and mostly masked by changes in reproduction and growth of fish and annual variability in environmental conditions such as temperature and water turbidity. Gillnet test fishing and echo sounding complemented each other well in monitoring the effects of management fishing. Where bream is one of the dominant species VPA is also recommended.

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SPATIAL AND TEMPORAL VARIABILITY OF FISH COMMUNITY BIOMASS IN COASTAL WATERS OF TANGERANG REGENCY, BANTEN

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v8i1.12751 ◽

2016 ◽

Vol 8 (1) ◽

pp. 39-55 ◽

Cited By ~ 1

Author(s):

Nina Nurmalia Dewi ◽

M Mukhlis Kamal ◽

Yusli Wardiatno

Keyword(s):

Coastal Waters ◽

Temporal Variability ◽

Fish Community ◽

Primary Data ◽

Spatial And Temporal Variability ◽

Fish Biomass ◽

Fish Community Structure ◽

Average Biomass ◽

Biomass Variability ◽

Swept Area

Coastal waters of Tangerang Regency has abundant in fish resource including pelagic, demersal, and reef fish. This study was conducted to assess fish biomass variability and of fish community structure in coastal waters of Tangerang Regency which can be used as a basis in determining alternatives for sustainable fish resource management. This research was conducted in June and August 2013 in three locations i.e., Kronjo, Cituis, and Tanjung Pasir. Primary data collected were fish weight per species. Fish biomass from each locations was obtained using swept area method using trawl. The results showed that Kronjo region contained the highest total average biomass of fish. Temporally, total ave-rage biomass of fish in August was higher than in June for Kronjo and Cituis. Meanwhile, the con-trary occurred in Tanjung Pasir. This conditions occurred due to the high current and high wave in August than in June. In general, biomass of planktivorous was dominant during the study indicating overfishing lead to fishing down the food web in the Coastal waters of Tangerang Regency. Keywords: biomass, coastal waters of Tangerang Regency, spatial and temporal variability, swept area, over fishing.

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Fish community structure, habitat complexity, and soundscape characteristics of patch reefs in a tropical, back-reef system

Marine Ecology Progress Series ◽

10.3354/meps12829 ◽

2019 ◽

Vol 609 ◽

pp. 33-48 ◽

Cited By ~ 7

Author(s):

RP Lyon ◽

DB Eggleston ◽

DR Bohnenstiehl ◽

CA Layman ◽

SW Ricci ◽

...

Keyword(s):

Community Structure ◽

Habitat Complexity ◽

Fish Community ◽

Back Reef ◽

Fish Community Structure ◽

Patch Reefs ◽

Reef System

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Dissolved oxygen and temperature best predict deep-sea fish community structure in the Gulf of California with climate change implications

Marine Ecology Progress Series ◽

10.3354/meps13240 ◽

2020 ◽

Vol 637 ◽

pp. 159-180

Author(s):

ND Gallo ◽

M Beckwith ◽

CL Wei ◽

LA Levin ◽

L Kuhnz ◽

...

Keyword(s):

Climate Change ◽

Community Structure ◽

Community Composition ◽

Environmental Conditions ◽

Deep Sea ◽

Gulf Of California ◽

Fish Community ◽

Demersal Fish ◽

Fish Community Structure ◽

Explained Variance

Natural gradient systems can be used to examine the vulnerability of deep-sea communities to climate change. The Gulf of California presents an ideal system for examining relationships between faunal patterns and environmental conditions of deep-sea communities because deep-sea conditions change from warm and oxygen-rich in the north to cold and severely hypoxic in the south. The Monterey Bay Aquarium Research Institute (MBARI) remotely operated vehicle (ROV) ‘Doc Ricketts’ was used to conduct seafloor video transects at depths of ~200-1400 m in the northern, central, and southern Gulf. The community composition, density, and diversity of demersal fish assemblages were compared to environmental conditions. We tested the hypothesis that climate-relevant variables (temperature, oxygen, and primary production) have more explanatory power than static variables (latitude, depth, and benthic substrate) in explaining variation in fish community structure. Temperature best explained variance in density, while oxygen best explained variance in diversity and community composition. Both density and diversity declined with decreasing oxygen, but diversity declined at a higher oxygen threshold (~7 µmol kg-1). Remarkably, high-density fish communities were observed living under suboxic conditions (<5 µmol kg-1). Using an Earth systems global climate model forced under an RCP8.5 scenario, we found that by 2081-2100, the entire Gulf of California seafloor is expected to experience a mean temperature increase of 1.08 ± 1.07°C and modest deoxygenation. The projected changes in temperature and oxygen are expected to be accompanied by reduced diversity and related changes in deep-sea demersal fish communities.

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Community changes of coral reef fishes in Bunaken National Park, North Sulawesi, Indonesia

AQUATIC SCIENCE & MANAGEMENT ◽

10.35800/jasm.1.2.2013.7273 ◽

2013 ◽

Vol 1 (2) ◽

pp. 117

Author(s):

Fakhrizal Setiawan ◽

Janny D Kusen ◽

Georis JF Kaligis

Keyword(s):

Reef Fish ◽

National Park ◽

Fish Community ◽

Time Series Data ◽

Coral Cover ◽

Fish Communities ◽

Reef Fishes ◽

Series Data ◽

Fish Community Structure ◽

Reef Fish Community

In order to look at changes in coral and reef fish communities during the period of 2006 to 2013, this research was carried out at Bunaken National Park (BNP) with 26 observation sites. The existing data and information of reef fish communities in the park generally could not be used as representative for describing the whole region. Percentage of coral cover and fish abundance during the study period shows that Bunaken Island is more similar to other locations. Reef fish community structure as seen from ecological index (H' at all sites being categorized, E category labile and low category C) shows the condition of the reef fish community is still good. Changes in the structure of reef fish communities showed declining conditions compared to 2006, and coral cover continued to decrease compared to 1998 and 2007. Good overall reef fish and coral cover have decreased; it is thought to be related to the pressure in BNP. Some of the pressures in the region were (i) increasing numbers of domestic as well as foreign visitors, (ii) increasing number of residents in the region, as well as the burden of waste and trash from the Bay of Manado. Penelitian dilakukan di Taman Nasional Bunaken (Utara dan Selatan) pada 26 lokasi pengamatan untuk menganalisis perubahan struktur komunitas ikan karang melalui kajian dari suatu time series data dari beberapa penelitian sebelumnya. Data primer mengenai ikan-ikan karang diperoleh melalui visual sensus bawah air yang bersamaan dengan observasi terumbu karang menggunakan point intercept transect. Nilai persentase tutupan karang dan kelimpahan ikan menunjukkan bahwa pada lokasi pengamatan Pulau Bunaken paling baik dibandingan lokasi lainnya. Struktur komunitas ikan karang yang dianalisis dengan indeks ekologi menunjukkan indeks keanekaragaman (H’) di semua site masuk kategori sedang, indeks kesamaan (E) kategori labil dan indeks Dominansi (C) kategori rendah. Hasil penelitian ini menunjukkan bahwa kondisi komunitas ikan karang masih baik, sekalipun perubahan struktur komunitas ikan karang menunjukkan kondisi yang menurun dibandingkan tahun 2006, begitu juga tutupan karang yang terus turun dibandingkan tahun 1998 dan 2007. Secara keseluruhan baik ikan karang maupun tutupan karang mengalami penurunan, hal ini diduga terkait dengan tekanan yang dialami kawasan TN. Bunaken. Salah satu tekanan terhadap kawasan adalah jumlah turis dari dalam maupun luar negeri yang semakin meningkat tiap tahunnya, penambahan jumlah penduduk di dalam kawasan, serta beban limbah dan sampah dari Teluk Manado.

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