Do Hydropeaking Flows Alter Juvenile Fish Growth Rates? A Test with Juvenile Humpback Chub in the Colorado River

2014 ◽  
Vol 31 (2) ◽  
pp. 156-164 ◽  
Author(s):  
C. Finch ◽  
W. E. Pine ◽  
K. E. Limburg
Keyword(s):  
Growth Rates ◽  
Colorado River ◽  
Juvenile Fish ◽  
Fish Growth ◽  
Humpback Chub

scholarly journals Growth of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

2017 ◽  
Vol 8 (1) ◽  
pp. 322-332 ◽  
Author(s):  
W.E. Pine III ◽  
K. Limburg ◽  
B. Gerig ◽  
C. Finch ◽  
D. Chagaris ◽  
...  
Keyword(s):  
Growth Rates ◽  
Environmental Conditions ◽  
Colorado River ◽  
Linear Models ◽  
Juvenile Fish ◽  
Grand Canyon ◽  
Analysis Of Covariance ◽  
Growth Variability ◽  
Management Actions ◽  
Humpback Chub

Abstract Assessments of growth can provide information needed to understand how fish populations respond to changing environmental conditions and management actions, including ecosystem experimentation. We estimated growth rates and parameter uncertainty from otoliths of endangered Humpback Chub Gila cypha from the Colorado River in Grand Canyon, Arizona. We then compared growth of Humpback Chub < age 2 that were 1) occupying the mainstem Colorado River during a period of variable discharge and cooler water temperatures (1980–1998; epoch 1), 2) occupying the Colorado River during a period of moderate discharge variability and warmer water (2001–2011; epoch 2), and 3) occupying the unregulated Little Colorado River. Because growth rates of juvenile Humpback Chub (< age 2) may be more sensitive to changes in environmental conditions than adult fish, we used analysis of covariance and linear models to compare growth of juvenile fish (slopes) between epochs and capture sites (mainstem Colorado River vs. Little Colorado River). Our analysis of covariance results were ambiguous (age × epoch × site interaction; P = 0.06). However, individual linear regressions of size and age by epoch and site suggest biologically important differences in growth, as evidenced by slower growth in the Colorado River in epoch 1 than in epoch 2, and slower growth in the Colorado River compared with the Little Colorado River for all time periods. Overall our results 1) provide information on growth and growth variability useful for parameterizing models to assess population viability and 2) provide empirical information on how growth of juvenile and adult Humpback Chub growth may respond to changing environmental conditions.

Growth of juvenile Coral Reef Damselfish: Spatial and Temporal variability, and the effect of population density

1992 ◽  
Vol 43 (5) ◽  
pp. 1129 ◽  
Author(s):  
CR Pitcher
Keyword(s):  
Population Density ◽  
Growth Rates ◽  
Natural Variation ◽  
Juvenile Fish ◽  
Fish Growth ◽  
Detectable Effect ◽  
Fish Length ◽  
Spatial And Temporal Variability ◽  
Juvenile Coral ◽  
Close Relationship

The growth rate of juvenile damselfish (Pornacentrus nagasakiensis) was estimated by daily ageing, using otoliths, and constructing length-at-age curves or, due to a close relationship between otolith radius and fish length, back-calculating the growth rates of individual fish. The growth of juvenile P. nagasakiensis was not detectably affected by population density, whether naturally established or manipulated. In one experiment, the presence of early recruits had no detectable effect on the growth of subsequent recruits, and postsettlement growth rates even increased slightly with subsequent pulses of settlement through the first half of the summer (as water temperature increased). However, in other (nonexperimental) samples, there may have been an interaction between prior recruitment and falling temperature that reduced growth rates. The rate of growth differed among habitats, but not in proportion to the densities established at settlement-as might be expected if preference for habitats conferring better growth had evolved. The growth of juvenile fish from different reefs within and between different regions of the Great Barrier Reef also showed some significant differences. In all analyses of variance, the residual natural variation accounted for most of the sums-of-squares, highlighting the great plasticity of fish growth.

scholarly journals Effects of Disparate Water Temperatures and Food Bases on Humpback Chub Growth Rates within the Little Colorado River, Arizona

2020 ◽  
Vol 40 (2) ◽  
pp. 475-487
Author(s):  
Dennis M. Stone ◽  
Michael J. Pillow ◽  
Kirk L. Young ◽  
David R. Van Haverbeke ◽  
James D. Walters
Keyword(s):  
Growth Rates ◽  
Colorado River ◽  
Humpback Chub

scholarly journals Managed Wetlands Can Benefit Juvenile Chinook Salmon in a Tidal Marsh

2021 ◽  
Author(s):  
Nicole M. Aha ◽  
Peter B. Moyle ◽  
Nann A. Fangue ◽  
Andrew L. Rypel ◽  
John R. Durand
Keyword(s):  
San Francisco ◽  
Growth Rates ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Nursery Habitat ◽  
San Francisco Estuary ◽  
Rice Fields ◽  
Fish Growth ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

AbstractLoss of estuarine and coastal habitats worldwide has reduced nursery habitat and function for diverse fishes, including juvenile Chinook salmon (Oncorhynchus tshawytscha). Underutilized off-channel habitats such as flooded rice fields and managed ponds present opportunities for improving rearing conditions and increasing habitat diversity along migratory corridors. While experiments in rice fields have shown enhanced growth rates of juvenile fishes, managed ponds are less studied. To evaluate the potential of these ponds as a nursery habitat, juvenile Chinook salmon (~ 2.8 g, 63 mm FL) were reared in cages in four contrasting locations within Suisun Marsh, a large wetland in the San Francisco Estuary. The locations included a natural tidal slough, a leveed tidal slough, and the inlet and outlet of a tidally muted managed pond established for waterfowl hunting. Fish growth rates differed significantly among locations, with the fastest growth occurring near the outlet in the managed pond. High zooplankton biomass at the managed pond outlet was the best correlate of salmon growth. Water temperatures in the managed pond were also cooler and less variable compared to sloughs, reducing thermal stress. The stress of low dissolved oxygen concentrations within the managed pond was likely mediated by high concentrations of zooplankton and favorable temperatures. Our findings suggest that muted tidal habitats in the San Francisco Estuary and elsewhere could be managed to promote growth and survival of juvenile salmon and other native fishes.

Distribution and Movement of Humpback Chub in the Colorado River, Grand Canyon, Based on Recaptures

2006 ◽  
Vol 135 (2) ◽  
pp. 539-544 ◽  
Author(s):  
Craig P. Paukert ◽  
Lewis G. Coggins ◽  
Christopher E. Flaccus
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Humpback Chub

Retardation and Recovery of Growth in Brook Trout Fry (Salvelinus fontinalis) Exposed for Various Durations to Acidified Water

1986 ◽  
Vol 43 (10) ◽  
pp. 2048-2050 ◽  
Author(s):  
W. H. Tam ◽  
P. D. Payson ◽  
R. J. J. Roy
Keyword(s):  
Growth Inhibition ◽  
Growth Rates ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Low Ph ◽  
Fish Growth ◽  
Control Fish ◽  
Treated Fish ◽  
Test Fish ◽  
Neutral Water

Brook trout fry (Salvelinus fontinalis) were exposed to pH 4.66 for various durations up to 141 d and then returned to neutral water. Growth of test fish was in general significantly lower than that of control fish for exposures up to days 45–78. In four of six groups of acid-treated fish, growth eventually recovered and the growth rates were not different from that of control fish. The results suggested that growth inhibition was induced early in the exposure to sublethally low pH and that recovery in the latter phase of the experiment occurred whether pH remained acidic or was readjusted to neutral.

scholarly journals Body Condition of Endangered Humpback Chub in Relation to Temperature and Discharge in the Lower Colorado River

2017 ◽  
Vol 8 (1) ◽  
pp. 333-342 ◽  
Author(s):  
Forest P. Hayes ◽  
Michael J. Dodrill ◽  
Brandon S. Gerig ◽  
Colton Finch ◽  
William E. Pine III
Keyword(s):  
Colorado River ◽  
Grand Canyon ◽  
Management Program ◽  
Parameter Estimates ◽  
Water Release ◽  
Fish Removal ◽  
Glen Canyon Dam ◽  
Management Actions ◽  
Humpback Chub ◽  
Glen Canyon

Abstract Determining the population status of endangered Humpback Chub Gila cypha is a major component of the adaptive management program designed to inform operation of Glen Canyon Dam upstream from Grand Canyon, Arizona. In recent decades, resource managers have identified a portfolio of management actions (with intermittent implementation) to promote population recovery of Humpback Chub, including nonnative fish removal, changes in water release volumes and discharge ramping schedules, and reductions in hydropower peaking operations. The Humpback Chub population in Grand Canyon has increased over this same period, causal factors for which are unclear. We took advantage of unusual hydrology in the Colorado River basin in 2011 to assess trends in juvenile Humpback Chub length–weight relationships and condition in the Colorado River below Glen Canyon Dam as well as in the unregulated Little Colorado River. Within each river, we observed higher length–weight b-parameter estimates (exponent of the standard power equation) at higher water temperatures. We also found higher slope estimates for the length–weight relationship at higher temperatures in the Little Colorado River. Slope estimates were more variable in the Colorado River, where mean water temperatures were more uniform. The next step is to examine whether Humpback Chub length–weight relationships influence population metrics such as abundance or survival. If these relationships exist, then monitoring condition in juvenile Humpback Chub would provide a quick and low-cost technique for assessing population response to planned management experiments or changing environmental conditions.

Predator–Prey Relationships for Juvenile Chinook Salmon, Oncorhynchus tshawytscha, Feeding on Zooplankton in "in situ" Enclosures

1983 ◽  
Vol 40 (3) ◽  
pp. 287-297 ◽  
Author(s):  
Karl K. English
Keyword(s):  
Growth Rates ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Fish Growth ◽  
Juvenile Salmon ◽  
Predator Prey ◽  
Juvenile Chinook Salmon ◽  
Successful Search ◽  
Juvenile Chinook

Juvenile chinook salmon, Oncorhynchus tshawytscha, were raised in 90-m3 mesh enclosures in Saanich Inlet, B.C. The enclosures permitted ample water and zooplankton circulation while retaining 5–6 g juvenile salmon. Mean growth rate was 1.8% wet body weight/d over 6 wk. Weekly growth rates ranged from 3.9%/d while food was abundant, to −0.5%/d when food was scarce. Zooplankton concentration inside and outside enclosures without fish were not significantly different. Organisms associated with the sides of the enclosures (non-pelagic) were not a major contributor to the growth of the juvenile chinook. There was a strong relationship between the fish growth rates and the abundance of 1.4- to 4.5-mm zooplankton. Rates of successful search varied directly with the size and inherent contrast of a prey item. The minimum rate of successful search was 2.3 m3/h for salmon feeding on 1.4- to 4.5-mm zooplankton. This rate of successful search, while far greater than previously suspected, is still within the visual capabilities of the juvenile salmon. The enclosed salmon grew rapidly on zooplankton concentrations that were 1/1000 of those required to sustain similar growth rates in tank experiments.Key words: predator–prey relationship, planktivorous salmonid, marine, "in situ" enclosures, search efficiency

scholarly journals Impact of Feed Rations on Growth, Selected Body Parameters and Maturation of Vendace, Coregonus Albula L., Reared in RAS

2014 ◽  
Vol 22 (2) ◽  
pp. 145-150
Author(s):  
Bożena Szczepkowska ◽  
Mirosław Szczepkowski ◽  
Iwona Piotrowska
Keyword(s):  
Growth Rates ◽  
Sexual Maturity ◽  
Fish Growth ◽  
Coregonus Albula ◽  
Body Weights ◽  
Intensive Rearing ◽  
Mature Fish ◽  
Final Survival ◽  
Body Parameters ◽  
Commercial Size

Abstract Vendace, Coregonus albula L., was reared to commercial size in a recirculating system. Three different feed rations were applied during the ten-month-long experiment. The feed rations impacted fish growth rates, and fish in the different groups achieved body weights of 26.6 g to 57.5 g. The final survival in all groups was similar from 44.3% among the fish fed the smallest feed ration to 53.2% in the group receiving the largest feed ration. No differences were noted in the share of viscera, peritoneal fat, or in the hepatosomatic indexes, but there were differences in the gonadosomatic indexes. After thermal stimulation, only males achieved sexual maturity. The number of mature fish was similar in all groups and ranged from 17.8 to 21.3% of all fish. The results of the present study indicated that vendace can achieve commercial size in an intensive rearing period of ten months in RAS.

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