Predicting fish abundance using single-pass removal sampling

2000 ◽  
Vol 57 (5) ◽  
pp. 951-961 ◽  
Author(s):  
Matthew G Mitro ◽  
Alexander V Zale
Keyword(s):  
Rainbow Trout ◽  
Prediction Interval ◽  
Prediction Intervals ◽  
Total Abundance ◽  
Simulated Population ◽  
River Section ◽  
Single Pass ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Abundance Estimates ◽  
Removal Sampling

Three-pass removal data for juvenile rainbow trout (Oncorhynchus mykiss) along bank areas of the Henrys Fork of the Snake River, Idaho, were used to construct a mean capture probability (MCP) model to predict abundance from single-pass catch data. We evaluated the MCP model by simulation. The precision of the MCP model was poor when predicting abundance within a specific bank unit. MCP model prediction intervals were about 7.5 times greater than three-pass removal intervals. However, the MCP model performed about the same as three-pass removal for predicting total abundance in a river section from multiple bank samples. We evaluated how the MCP model can be used to improve precision of total abundance estimates. Reallocating effort to sample 150 bank units by single-pass removal rather than 50 bank units by three-pass removal resulted in a 48% increase in prediction interval precision for a simulated population of 10 000 fish. Precision also increased when allocating effort to sampling more bank units of smaller length versus fewer bank units of longer length. Sampling 1500 m of bank as one hundred 15-m bank units increased precision by about 28% versus sampling fifty 30-m bank units and by about 50% versus sampling twenty-five 60-m bank units.

Effects of flow fluctuations on habitat use and survival of age-0 rainbow trout (Oncorhynchus mykiss) in a large, regulated river1This article is a companion to Korman et al. 2011, published this issue.

2011 ◽  
Vol 68 (6) ◽  
pp. 1097-1109 ◽  
Author(s):  
Josh Korman ◽  
Carl Walters ◽  
S.J.D. Martell ◽  
W.E. Pine ◽  
Andrew Dutterer
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Early Life History ◽  
Regulated Rivers ◽  
Minimum Flow ◽  
Glen Canyon Dam ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Flow Fluctuations ◽  
Abundance Estimates ◽  
Hourly Variation

We evaluated effects of reduced hourly variation in flow from Glen Canyon Dam on survival of age-0 rainbow trout ( Oncorhynchus mykiss ) in the Colorado River, Arizona, USA, based on monthly abundance estimates. The proportion of the age-0 population in low-angle shorelines, which are potentially more sensitive to flow variability, declined from 70% in June to 20% in November as fish grew and made an ontogenetic habitat shift to deeper habitat. Average daily instantaneous mortality between August and September was 0.008 units lower in years when there was no change in the minimum flow compared with years when there was a sudden 50% reduction in the minimum flow. However, mortality was 0.006 units higher during the fall when there was no hourly variation in flow compared with years when flows fluctuated. As a result of these opposing patterns, 3-month age-0 survival across steady (0.31) and unsteady (0.28) flow regimes were very similar. While additional replication is required to strengthen inferences about effects of steadier flows, we demonstrate the utility of early life history monitoring for evaluating effects of flow management on fish populations in regulated rivers.

The relation between age-0 rainbow trout (Oncorhynchus mykiss) abundance and winter discharge in a regulated river

2003 ◽  
Vol 60 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Matthew G Mitro ◽  
Alexander V Zale ◽  
Bruce A Rich
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Prediction Interval ◽  
Critical Time ◽  
Regulated River ◽  
Test Model ◽  
High Discharge ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Model Predictions ◽  
The Mean

We identified and experimentally tested a discharge–abundance relation that predicted, based on the mean river discharge in the second half of winter (15 January – 31 March), the spring abundance of age-0 rainbow trout (Oncorhynchus mykiss) in a section of the Henrys Fork of the Snake River, Idaho, with complex bank habitat. We also considered a competing hypothesis in which autumn abundance determined spring abundance. We established that large abundances of age-0 trout were present in autumn (34 000 – 81 000) and lower abundances remained in spring (8000 – 15 000). Winter loss of age-0 trout was initiated in January. Spring abundance in 1996–1998 was related to autumn abundance (r2 > 0.99) and mean discharge in the second half of winter (17.1–22.8 m3·s–1; r2 > 0.99) but not mean discharge in the first half of winter (15.1–21.1 m3·s–1; r2 = 0.11). We experimentally maintained a high discharge (20–21 m3·s–1) in the second half of winter in 1999 to test model predictions. Autumn abundance failed to predict spring abundance (observed = 11 109; predicted = 6822; 95% prediction interval = 4669–8975). However, the discharge–abundance model accurately predicted spring abundance (predicted = 11 980; 95% prediction interval = 10 728 – 13 231). Higher discharge in the second half of winter may have provided more bank habitat at a critical time for survival.

Direct and indirect effects of sediment pulse duration on stream invertebrate assemblages and rainbow trout (Oncorhynchus mykiss) growth and survival

2001 ◽  
Vol 58 (11) ◽  
pp. 2213-2221 ◽  
Author(s):  
E Al Shaw ◽  
John S Richardson
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Pulse Duration ◽  
Indirect Effects ◽  
Benthic Invertebrate ◽  
Fine Sediment ◽  
Sediment Supply ◽  
Invertebrate Drift ◽  
Total Abundance ◽  
Rainbow Trout Oncorhynchus Mykiss

Elevated concentrations of inorganic sediment supply in streams may impair many biological functions. However, the contribution of exposure duration to the observed impacts has not been previously considered. We evaluated the effects of sediment pulse duration using 14 streamside flow-through experimental channels, each of which contained a naturally colonised invertebrate assemblage and 10 rainbow trout (Oncorhynchus mykiss) fry. Channels were exposed to fine sediment pulses of constant concentration but varied pulse duration (ranging from 0 to 6 h) every second day over 19 days. Total abundance of benthic invertebrate and family richness declined as sediment pulse duration increased. Invertebrate drift total abundance increased as pulse duration increased; however, family richness of drift decreased. Trout length and mass gain over the 19-day period was negatively correlated with pulse duration. Path analysis suggests that the direct effects of fine sediment on trout (impaired vision leading to reduced prey capture success and (or) increased metabolic costs from physiological stress) are more important to trout growth than indirect effects (decreased drift and benthic invertebrate richness and drift abundance).

The essential oils of some medicinal plants on the immune system of rainbow trout (Oncorhynchus mykiss)

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
A Ghasemi Pirbalouti ◽  
E Pirali ◽  
G Pishkar ◽  
S Mohammadali Jalali ◽  
M Reyesi ◽  
...  
Keyword(s):  
Immune System ◽  
Rainbow Trout ◽  
Medicinal Plants ◽  
Oncorhynchus Mykiss ◽  
Essential Oils ◽  
Rainbow Trout Oncorhynchus Mykiss

Nuclear distribution of genotoxic damage in rainbow trout (Oncorhynchus mykiss) sperm after cryopreservation

2014 ◽  
Author(s):  
Silvia Gonzalez-Rojo ◽  
Cristina Fernandez-Diez ◽  
Marta Lombo ◽  
Vanesa Robles Rodriguez ◽  
Herraez Maria Paz
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Genotoxic Damage ◽  
Nuclear Distribution ◽  
Rainbow Trout Oncorhynchus Mykiss

Results of Surveillance Studies of Infectious Fish Diseases in Freshwater Aquaculture of Ukraine

2015 ◽  
Vol 2 (2) ◽  
pp. 32-38 ◽  
Author(s):  
N. Matvienko ◽  
A. Vashchenko ◽  
I. Tsiganok ◽  
L. Buchatsky
Keyword(s):  
Rainbow Trout ◽  
Infectious Diseases ◽  
Cell Cultures ◽  
Standardized Test ◽  
Age Groups ◽  
Infectious Pancreatic Necrosis Virus ◽  
Test System ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Freshwater Aquaculture ◽  
Pancreatic Necrosis Virus

Aim. To investigate the epizootic state of fi sheries in Ukraine; to study the biological specifi cities of viral and bacterial isolates of fi sh in freshwater aquaculture. Methods. The epizootic state of fi sheries was defi ned ac- cording to the surveillance plan for fi sheries, virological (biosampling of sensitive fi sh species, virus isolation on sensitive passaged cell cultures), serological (enzyme immunoassay, virus neutralization test using sensitive passaged cell cultures) and molecular-biological (reverse transcriptase polymerase chain reaction − RTPCR) methods of investigation were used. The pathogenicity of the isolated bacteria was studied in the biosample. The identifi cation was performed using Bergey’s Manual. The express-identifi cation of bacteria was performed using the standardized test-system API 20E Bio Merieux (France). Results. The IPNV isolates of rainbow trout were fi rst isolated in the fi sheries of different forms of ownership in the western regions of Ukraine (Volyn, L’viv, Transcarpathian, Chernivtsi regions). It was demonstrated that different age groups of carp are infested with the virus in the fi sheries of L’viv, Donetsk, Chernihiv, Kyiv, and Odesa regions which testifi es to a wide spread of the virus in Ukraine. Out of fi sh infectious diseases the red spot-like disease and the swim bladder infl ammation of carp, the diseases of young trout and sturgeon were detected in the investigated fi sheries of Ukraine. Conclusions. The epizootic data were used to estimate the condition of the fi sheries in Ukraine in terms of fi sh infectious diseases. An infectious pancreatic necrosis virus, new for Ukraine, was revealed. It was found to affect rainbow trout (Oncorhynchus mykiss , Walbaum, 1792) and the spread of SVCV in carp fi sheries was demonstrated. As for bacterial fi sh diseases, the decrease in the epizootic situation was described along with considerable extension of the range of species of bacterial pathogens of fi sh. Annual systematic monitoring and measures of preventing the introduction of the agents of infectious diseases are the guarantee of protection of the specialized fi sheries of Ukraine.

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