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

1992 ◽  
Vol 49 (8) ◽  
pp. 1722-1733 ◽  
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.

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

1988 ◽  
Vol 45 (S1) ◽  
pp. s115-s120 ◽  
Author(s):  
J. R. M. Kelso
Keyword(s):  
Fish Community ◽  
Carbon Assimilation ◽  
Lake Acidification ◽  
Fish Stock ◽  
Fish Biomass ◽  
Unit Surface Area ◽  
Fish Community Structure ◽  
Fish Flesh ◽  
Unit Surface ◽  
Turkey Lakes Watershed

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.

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

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.

Balancing Fisheries Management and Water Uses for Impounded River Systems

2008 ◽  
Keyword(s):  
Fisheries Management ◽  
Flood Control ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Length Distribution ◽  
Gizzard Shad ◽  
Length Frequency Distribution ◽  
Dorosoma Cepedianum ◽  
Predator Species ◽  
Water Uses

<em>Abstract</em>.—Larval fish assemblages are an important component of reservoir communities by providing an abundant prey source critical to the recruitment of predator species into recreational fisheries. We examined the composition, abundance, and length distribution of larval fish in several Nebraska flood-control reservoirs from 2000 to 2004 that were stocked with walleye <em>Sander vitreus </em>and experienced weather-related extirpations of gizzard shad <em>Dorosoma cepedianum</em>. Gizzard shad dominated the larval fish assemblages with a wide-ranging length distribution prior to extirpation. After extirpation, Centrarchidae species eventually filled the void with a smaller and truncated length-frequency distribution. Larval fish densities varied widely throughout the study period with fewer prey available to predators with gizzard shad present in the assemblages. The extirpation of gizzard shad elicited a significant change to the larval fish assemblages of these reservoirs but did not prohibit the survival of stocked walleye fingerlings.

Balancing Fisheries Management and Water Uses for Impounded River Systems

2008 ◽  
Keyword(s):  
Trophic State ◽  
Supply And Demand ◽  
Gizzard Shad ◽  
Fish Biomass ◽  
Dorosoma Cepedianum ◽  
Fish Prey ◽  
Watershed Area ◽  
Reservoir Volume ◽  
Poor Recruitment ◽  
Acoustic Surveys

<em>Abstract</em>.—In Ohio reservoirs, a perceived excess of available gizzard shad <em>Dorosoma cepedianum </em>prey and poor recruitment of stocked walleyes <em>Sander vitreus </em>during the 1970s resulted in research to develop and expand a program to stock saugeyes (walleye × sauger <em>S. canadensis</em>), a hybrid better suited for shallow, productive, and turbid reservoirs with short water-residence times. Development of successful production techniques increased saugeye stocking from fewer than 1.2 million to 6–10 million fingerlings (28–42 mm) per year during 1980 through 1990, presenting the challenge of determining stocking rates suited to available prey. To improve <em>Sander </em>spp. stocking practices, we assessed prey supply by quantifying fish biomass in Ohio reservoirs using acoustic technology. Fish biomass varied from 10 to 897 kg/ha as estimated by 53 acoustic surveys conducted on 16 reservoirs during 1999–2006. Among 15 variables associated with reservoir productivity, 84% of the variability in fish biomass was explained by watershed area, trophic state, reservoir area, and reservoir volume; watershed area plus trophic state explained 77% of this variability. Dominance of fish prey smaller than 150 mm, which represented more than 80% of fishes sampled in acoustic surveys, revealed that reservoir fish biomass largely reflected the upper limit of prey fish biomass morphologically available to age-1 and older <em>Sander </em>spp. Gizzard shad represented more than 50% of the fishes captured in 92% of gill-netting surveys conducted in conjunction with acoustic surveys. Unexpectedly, reservoirs with extensive prey biomass occasionally had poor recruitment for <em>Sander </em>spp., and these reservoirs often were stocked at lower rates than ones with better recruitment. Fisheries managers in Ohio can improve stocking practices by using acoustic surveys to predict reservoir capacity for stocked sport fish based on reservoir attributes, then applying these results to details of reservoir-specific recruitment of stocked fishes and their consumptive demand. Refining this supply and demand approach will require continual progress in understanding reservoir ecosystems and their watersheds.

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

Hydrobiologia ◽  
2020 ◽  
Vol 847 (21) ◽  
pp. 4559-4573 ◽  
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.

scholarly journals Planktivores and Plankton Dynamics: Effects of Fish Biomass and Planktivore Type

1992 ◽  
Vol 49 (7) ◽  
pp. 1466-1473 ◽  
Author(s):  
Xavier Lazzaro ◽  
Ray W. Drenner ◽  
Roy A. Stein ◽  
J. Durward Smith
Keyword(s):  
Water Quality ◽  
Green Algae ◽  
Primary Productivity ◽  
Trophic Cascade ◽  
Gizzard Shad ◽  
Particulate Phosphorus ◽  
Fish Biomass ◽  
Dorosoma Cepedianum ◽  
Pennate Diatoms ◽  
Plankton Communities

We quantified the effects of planktivore biomass and planktivore type in an experimental mesocosm study of factorial design in which five levels of fish biomass (0–75 g/m3) were cross-classified with two plantivore types: filter-feeding gizzard shad (Dorosoma cepedianum) and visual-feeding bluegill (Lepomis macrochims). As fish biomass increased, cladocerans, cyclopoids, particulate phosphorus (PP) > 200 μm, and chironomids declined; conversely, rotifers, primary productivity, chlorophyll a, turbidity, unicellular flagellates, colonial and unicellular green algae, pennate diatoms, total phosphorus, and 20–200 and 12–20 μm PP were enhanced. In the presence of gizzard shad, as compared with bluegill, cyclopoids, turbidity, unicellular green algae, pennate diatoms, > 200 μm PP, and chironomid tubes were higher whereas colonial green algae and < 0.2 μm PP were lower. Fish biomass operated independently of planktivore type for most variables, except copepods, colonial green algae, turbidity, and 20–200 μm PP. Although gizzard shad and bluegill have different trophic cascade pathways, fish biomass was more important than planktivore type as a regulator of plankton communities and water quality.

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

2016 ◽  
Vol 8 (1) ◽  
pp. 39-55 ◽  
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.

scholarly journals The consequences of balanced harvesting of fish communities

2014 ◽  
Vol 281 (1775) ◽  
pp. 20132701 ◽  
Author(s):  
Nis S. Jacobsen ◽  
Henrik Gislason ◽  
Ken H. Andersen
Keyword(s):  
Fish Community ◽  
Trophic Structure ◽  
Juvenile Fish ◽  
Fish Communities ◽  
Maximum Sustainable Yield ◽  
Biomass Composition ◽  
Forage Fish ◽  
Sustainable Yield ◽  
Fish Community Structure ◽  
Total Maximum

Balanced harvesting, where species or individuals are exploited in accordance with their productivity, has been proposed as a way to minimize the effects of fishing on marine fish communities and ecosystems. This calls for a thorough examination of the consequences balanced harvesting has on fish community structure and yield. We use a size- and trait-based model that resolves individual interactions through competition and predation to compare balanced harvesting with traditional selective harvesting, which protects juvenile fish from fishing. Four different exploitation patterns, generated by combining selective or unselective harvesting with balanced or unbalanced fishing, are compared. We find that unselective balanced fishing, where individuals are exploited in proportion to their productivity, produces a slightly larger total maximum sustainable yield than the other exploitation patterns and, for a given yield, the least change in the relative biomass composition of the fish community. Because fishing reduces competition, predation and cannibalism within the community, the total maximum sustainable yield is achieved at high exploitation rates. The yield from unselective balanced fishing is dominated by small individuals, whereas selective fishing produces a much higher proportion of large individuals in the yield. Although unselective balanced fishing is predicted to produce the highest total maximum sustainable yield and the lowest impact on trophic structure, it is effectively a fishery predominantly targeting small forage fish.

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