Annual Variation in Larval Fish Assemblages in a Heavily Regulated River During Differing Hydrological Conditions

2015 ◽  
Vol 32 (6) ◽  
pp. 1207-1219 ◽  
Author(s):  
K.  J.  M. Cheshire ◽  
Q. Ye ◽  
B.  M. Gillanders ◽  
A. King
Keyword(s):  
Annual Variation ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Regulated River ◽  
Hydrological Conditions

Temporal variation of larval fish assemblages of the Murray Mouth in prolonged drought conditions

2013 ◽  
Vol 64 (10) ◽  
pp. 932 ◽  
Author(s):  
L. B. Bucater ◽  
J. P. Livore ◽  
C. J. Noell ◽  
Q. Ye
Keyword(s):  
Fish Assemblages ◽  
Larval Fish ◽  
River System ◽  
Sampling Period ◽  
Marine Species ◽  
Flow Regulation ◽  
Nursery Areas ◽  
Transition Zones ◽  
Murray Darling Basin ◽  
Drought Conditions

Estuaries are transition zones that link freshwater and marine ecosystems and are often used as nursery areas by fish. The Murray–Darling Basin, which is heavily affected by flow regulation and water extraction, is the largest river system in Australia and terminates at the Murray Mouth estuary. Protracted drought conditions resulted in extremely low flows to the Murray Mouth that affected water condition, fish abundance, community structure and fish use of the estuary (e.g. nursery areas). The aims of the present study were to examine temporal changes in larval fish assemblages in this estuary. The assemblages were dominated by two gobiid species, Arenigobius bifrenatus and Tasmanogobius lasti. There was a noticeable absence or low abundance of freshwater, diadramous and large-bodied marine species that use this estuary for reproductive functions. Monthly differences in larval fish assemblages, between August–September and October–November, were attributed to increases in the abundances of A. bifrenatus in October and November and oscillation in T. lasti during the entire sampling period. The outcomes of the present study suggested that larval fish assemblages in drought conditions are limited to small-bodied species tolerant of high salinities and that freshwater flows are needed for the estuary to function as a nursery for other species.

scholarly journals Interannual variability of larval fish assemblages associated with water masses in winter in the Taiwan Strait during 2007–2013

2021 ◽  
Author(s):  
Yu-Kai Chen ◽  
Chia-Yi Pan ◽  
Yi-Chen Wang ◽  
Hsiu-Ju Tseng ◽  
Bo-Kun Su ◽  
...  
Keyword(s):  
Fish Assemblages ◽  
Larval Fish ◽  
Taiwan Strait ◽  
Assemblage Structure ◽  
Sea Surface ◽  
Coastal Current ◽  
Annual Variations ◽  
Frontal Zones ◽  
The Taiwan Strait

AbstractIn this study, the interannual variations of ichthyoplankton assemblages in the Taiwan Strait (TS) during the winters of 2007–2013 were determined. The cold China Coastal Current (CCC) and Mixed China Coastal Water (MCCW) intruded into the TS and impinged with the warm Kuroshio Branch Current (KBC) with annual variations. Consequently, the ichthyoplankton community in the TS was mainly structured into two assemblages characterized by differing environmental conditions. The composition of the warm KBC assemblage was relatively stable and was characterized by Diaphus B and Bregmaceros spp. By contrast, the cold MCCW assemblage demonstrated considerable variations over the years, with demersal Gobiidae and Scorpaenidae families considered the most representative. In addition, Benthosema pterotum and Trichiurus spp. were common in both KBC and MCCW assemblages. The distribution of the KBC assemblage demonstrated sharp boundaries in the frontal zones, whereas changes in the assemblage structure between the frontal zones were gradual for the MCCW assemblage, particularly when demersal taxa were dominant. Sea surface temperature and salinity were most strongly associated with variability in the assemblage structure during the study period. Thus, this paper provides a better understanding of long-term larval fish dynamics during winter in the TS.

Performance of a pool-and-weir fish pass for small bottom-dwelling freshwater fish species in a regulated lowland river

2007 ◽  
Vol 57 (4) ◽  
pp. 423-432 ◽  
Author(s):  
Evelien Maerten ◽  
Marcel Eens ◽  
Guy Knaepkens
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Fish Assemblages ◽  
Regulated River ◽  
Lowland River ◽  
Stone Loach ◽  
Spined Loach ◽  
Freshwater Fish Species ◽  
Cottus Gobio ◽  
Fish Pass

AbstractAlthough small benthic freshwater fish species are an important biological component of fish assemblages and free instream movement is indispensable for their survival, they are often neglected in fish pass performance studies. In this study, a capture-mark-recapture approach was used to assess whether small bottom-dwelling species, including gudgeon (Gobio gobio), stone loach (Barbatula barbatula), spined loach (Cobitis taenia) and bullhead (Cottus gobio), were able to cross a pool-and-weir fish pass in a regulated lowland river. Some tagged individuals of stone loach (18%), gudgeon (7%) and spined loach (2%) managed to successfully ascend the fish pass under study, despite the fact that water velocity levels in the different overflows of the facility (between 0.55-1.22 m/s) exceeded the critical swimming speed of all three species. Although this suggests that a pool-and-weir fish pass is a able to facilitate upstream movement of some small benthic species in a regulated river, more detailed research incorporating advanced tagging and retrieving techniques is necessary.

Summer larval fish assemblages in the Southern Tyrrhenian Sea (Western Mediterranean Sea)

2014 ◽  
Vol 36 (1) ◽  
pp. 104-117 ◽  
Author(s):  
Daniela Giordano ◽  
Adriana Profeta ◽  
Barbara Busalacchi ◽  
Roberta Minutoli ◽  
Letterio Guglielmo ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Western Mediterranean ◽  
Tyrrhenian Sea ◽  
Western Mediterranean Sea ◽  
Southern Tyrrhenian Sea

Demersal and larval fish assemblages in the Chukchi Sea

2010 ◽  
Vol 57 (1-2) ◽  
pp. 57-70 ◽  
Author(s):  
Brenda L. Norcross ◽  
Brenda A. Holladay ◽  
Morgan S. Busby ◽  
Kathryn L. Mier
Keyword(s):  
Fish Assemblages ◽  
Larval Fish ◽  
Chukchi Sea

Adult and larval fish assemblages vary among small tributary mouths of Green Bay, Lake Michigan

2021 ◽  
Author(s):  
Amelia T McReynolds ◽  
Megan L. Hoff ◽  
Angelena A. Sikora ◽  
Cynthia I. Nau ◽  
Michael J. Pietraszek ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Lake Michigan ◽  
Fish Assemblages ◽  
Water Movement ◽  
Larval Fish ◽  
Spatial Dynamics ◽  
Spatial And Temporal Variation ◽  
Adult Fish ◽  
Green Bay ◽  
Small Tributary

Small tributaries of the Great Lakes serve as important habitat during critical life stages of many fish species, though temporal and spatial dynamics of the assemblage that uses these systems are seldom investigated. This study quantifies larval and adult fish assemblages captured by fyke net and light traps among small tributary mouths of Green Bay, Lake Michigan. Ten tributaries harbored a total of forty-five species representing seventeen families, with the most abundant including spottail shiner (Notropis hudsonius (Clinton 1824)) in adult assemblages and white sucker (Catostomus commersonii (Lacepède 1803)) in larval assemblages. Larval fish assemblage structures differed over five biweekly sampling events in May and June. Adult fish assemblage structures varied among tributaries but not among spring, summer, and fall samples. Larval and adult species assemblages at these rivermouths are likely influenced by hydrology, habitat structure, and species-specific ecology. Water movement may transport larvae into rivermouths, as larval assemblages were dominated by species that spawn in coastal habitats. Adult species richness varied with longitude, with the greatest diversity in tributaries on the west shore. This investigation of fish assemblages highlights the spatial and temporal variation that occurs in these systems and their role in shaping fish populations in Green Bay.

Diel patterns in spatial distribution of fish assemblages in lentic and lotic habitat in a regulated river

2020 ◽  
Vol 36 (7) ◽  
pp. 1014-1023
Author(s):  
Bernhard Wegscheider ◽  
Tommi Linnansaari ◽  
Craig C. Wall ◽  
Mark D. Gautreau ◽  
Wendy A. Monk ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Fish Assemblages ◽  
Regulated River ◽  
Diel Patterns ◽  
Lotic Habitat ◽  
Distribution Of Fish

scholarly journals Isolating causal pathways between flow and fish in the regulated river hierarchy

2015 ◽  
Vol 72 (11) ◽  
pp. 1731-1748 ◽  
Author(s):  
Ryan A. McManamay ◽  
Brandon K. Peoples ◽  
Donald J. Orth ◽  
Charles A. Dolloff ◽  
David C. Matthews
Keyword(s):  
Structural Equation ◽  
Large Scale ◽  
Fish Assemblages ◽  
Causal Structure ◽  
River Regulation ◽  
Regulated River ◽  
Equation Modeling ◽  
Regulated Rivers ◽  
Causal Pathways ◽  
The Hierarchical Structure

Unregulated river systems are organized in a hierarchy in which large-scale factors (i.e., landscape and segment scales) influence local habitats (i.e., reach, meso-, and microhabitat scales), and both differentially exert selective pressures on biota. Dams, however, create discontinua in these processes and change the hierarchical structure. We examined the relative roles of hydrology and other instream factors, within a hierarchical landscape context, in organizing fish communities in regulated and unregulated tributaries to the Upper Tennessee River, USA. We used multivariate regression trees to identify factors that partition fish assemblages based on trait similarities, irrespective of spatial scale. We then used classical path analysis and structural equation modeling to evaluate the most plausible hierarchical causal structure of specific trait-based community components, given the data. Both statistical approaches suggested that river regulation affects stream fishes through a variety of reach-scale variables, not always through hydrology itself. Although we observed different changes in flow, temperature, and biotic responses according to regulation types, the most predominant path in which dam regulation affected biota was via temperature alterations. Diversion dams had the strongest effects on fish assemblages. Diversion dams reduced flow magnitudes, leading to declines in fish richness but increased temperatures, leading to lower abundances in equilibrium species and nest guarders. Peaking and run-of-river dams increased flow variability, leading to lower abundances in nest-guarding fishes. Flow displayed direct relationships with biotic responses; however, results indicated that changes in temperature and substrate had equal, if not stronger, effects on fish assemblage composition. The strength and nature of relationships depended on whether flow metrics were standardized for river size. We suggest that restoration efforts in regulated rivers focus on improving flow conditions in conjunction with temperature and substrate restoration.

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