Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Size Structure ◽  
Water Bodies ◽  
Frequency Distributions ◽  
Gill Nets ◽  
Large Water ◽  
Catch Rates ◽  
Small Sample Sizes ◽  
Standing Waters

<em>Abstract</em>.—Twenty-six Nebraska water bodies representing two ecosystem types (small standing waters and large standing waters) were surveyed during 2008 and 2009 with tandem-set hoop nets and experimental gill nets to determine if similar trends existed in catch rates and size structures of channel catfish Ictalurus punctatus captured with these gears. Gear efficiency was assessed as the number of sets (nets) that would be required to capture 100 channel catfish given observed catch per unit effort (CPUE). Efficiency of gill nets was not correlated with efficiency of hoop nets for capturing channel catfish. Small sample sizes prohibited estimation of proportional size distributions in most surveys; in the four surveys for which sample size was sufficient to quantify length-frequency distributions of captured channel catfish, distributions differed between gears. The CPUE of channel catfish did not differ between small and large water bodies for either gear. While catch rates of hoop nets were lower than rates recorded in previous studies, this gear was more efficient than gill nets at capturing channel catfish. However, comparisons of size structure between gears may be problematic.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Size Structure ◽  
Low Frequency ◽  
Relative Standard Error ◽  
Limited Information ◽  
Blue Catfish ◽  
Frequency Distributions ◽  
Gill Nets ◽  
Pulsed Dc ◽  
Gill Net ◽  
Catch Rates

<em>Abstract</em>.—Despite increasing popularity of blue catfish <em>Ictalurus furcatus</em> with anglers, effective management of blue catfish has been hindered by limited information on appropriate sampling methods. We compared the efficiency, precision, and accuracy of low-frequency pulsed-DC electrofishing and experimental gill nets for use in estimating relative population abundance and size structure in 12 reservoirs. Electrofishing yielded greater catch rates and lower mean relative standard error (RSE) than gill nets. Similarly, the number of samples necessary to achieve a RSE = 0.25 was lower with electrofishing in most reservoirs. Gill-net catch per unit effort (CPUE) and electrofishing CPUE were strongly correlated (<EM>P</EM> < 0.01), and length-frequency distributions were also similar between gear types in many reservoirs examined. Where they differed, there was no consistent pattern, suggesting that differences were due to low precision (caused by low numbers of fish captured) rather than gear bias. Our analysis indicated that both low-frequency pulsed-DC electrofishing and gill netting effectively measured relative abundance of blue catfish. In most cases, electrofishing was more efficient at estimating CPUE and size structure (requiring fewer samples to achieve comparable precision); thus, we recommend using this gear when estimating these parameters for reservoir blue catfish populations.

Urban and Community Fisheries Programs: Development, Management, and Evaluation

2008 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Cost Savings ◽  
Urban Lake ◽  
Development Management ◽  
Small Channel ◽  
Large Channel ◽  
P 16 ◽  
Community Fisheries ◽  
Catch Rates

<em>Abstract.-</em>Little published information exists on the utility of tournament and anglercatch data for assessing sizes and numbers of channel catfish <em>Ictalurus punctatus</em>. We compared channel catfish caught concurrently from May-August 2006 by small tournament anglers, creel-surveyed anglers, and soybean-baited tandem hoop nets (nets) in Lake Manawa, an 800 ac urban lake in Council Bluffs, Iowa. Mean total length of channel catfish caught was lowest in the nets, intermediate for creel-surveyed anglers, and highest for tournament anglers. Tournament anglers selected against small channel catfish (i.e., RSD S-Q: 11-16 in), selected for intermediate-sized channel catfish (RSD Q-P: 16-24 in), and caught similar proportions of large channel catfish (RSD P-M: 24-28 in) as compared to creel-surveyed anglers. Comparisons of angler and net catch rates by size categories revealed that both tournament and creel-surveyed anglers selected against small channel catfish, but overestimated both intermediate and larger channel catfish. We believe there is some utility and cost-savings benefits associated with using angler-caught channel catfish data for making management decisions, but biases need to be considered and more information on comparisons between angler caught channel catfish and sampling data are warranted.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Water Temperature ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Natural Habitat ◽  
Climatic Conditions ◽  
Water Bodies ◽  
The Soviet Union ◽  
Private Entrepreneurs ◽  
Marine Lagoon ◽  
Local Water

<em>Abstract</em>.—The channel catfish <em>Ictalurus punctatus</em> was first introduced from the United States to the Soviet Union in 1972–1979. From the Krasnodar region of Russia, it was introduced into Georgia during 1976–1978. Ecological studies of channel catfish were initiated along with the naturalization of this new species. Channel catfish were initially reproduced and reared in aquaculture ponds, and offspring from these ponds were used to stock natural water bodies, in particular lakes, where natural populations were formed. The climatic conditions of Georgia are close to the natural habitat of channel catfish. The number of days with water temperature higher than 20°C is about 120–140, and the accumulated heat reaches up to 2,400–2,792 degrees/d. They were also introduced into Lake Paliastomi (open marine lagoon) where the salinity fluctuates up to 8–14‰. These fish were caught in areas with salinity up to 14‰ and were often encountered in waters of 4–5‰ salinity or greater. Channel catfish grew well in the low-lying warm water bodies: they reached, on average, 19 g at age 1, 310 g at age 2, 1,300 g at age 3, 2,900 g at age 4, and 4,600 g at age 5. The fish became sexually mature in 3 years. Spawning occurred from May to June, when water temperature reached 24°C or higher. Channel catfish fed on a variety of insects, crustaceans, other bottom-dwelling arthropods, and fishes, especially crucian carp <em>Carassius carassius</em>, which is a strong competitor and is widely spread in the local water bodies. Channel catfish were considered a valuable introduction because they grew well, were adaptable to a wide range of conditions, were highly palatable, and provided important recreational sport fisheries, commercial fisheries, and aquaculture industries. There was concern that channel catfish were being overharvested, and consequently, in 2005, Georgia passed a bill that provided for more restrictive fishing regulations to protect this species from overharvest. The role of society and private entrepreneurs in the protection of channel catfish and regulation of its fisheries is important.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Habitat Use ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Mississippi River ◽  
Early Life ◽  
Anthropogenic Activities ◽  
Main Channel ◽  
Low Velocity ◽  
Middle Mississippi River ◽  
Catch Rates

<em>Abstract</em>.—Channel catfish <em>Ictalurus punctatus</em> are a major recreational and commercially important large river species. However, anthropogenic activities have heavily degraded the majority of riverine catfish habitats. To maintain catfish populations, an understanding of channel catfish early-life habitat use is necessary. We quantified habitat use of juvenile channel catfish in the middle Mississippi River from 2004 through 2007 by trawling in main channel, channel border, island, and artificial structure habitat (i.e., river training structures or wing dikes) features throughout the sampling reach (<EM>N</EM> = 878 trawls; <EM>N</EM> = 538 juvenile channel catfish). Channel catfish occurred most frequently in island and off-channel habitats. Few juvenile channel catfish were trawled in the main channel. All macrohabitat features were used by a broad size range of juvenile channel catfish, with the exception of the main channel, where only larger juvenile channel catfish were captured. Within each habitat, juvenile channel catfish catch rates were highest in sand substrate, low velocity, and shallow depths. Channel catfish in the middle Mississippi River use a variety of habitats during early life. Maintaining existing habitats, creating habitats with these attributes, and coupling this with proper management will foster sustainability of the channel catfish population at current commercial and recreational fishing levels in the middle Mississippi River.

Urban and Community Fisheries Programs: Development, Management, and Evaluation

2008 ◽  
Keyword(s):  
Rainbow Trout ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Largemouth Bass ◽  
Urban Areas ◽  
Micropterus Salmoides ◽  
White Male ◽  
Lepomis Macrochirus ◽  
Community Fisheries ◽  
Catch Rates

<em>Abstract.-</em>Demographic studies have indicated that, since 1990, Kentucky’s urban population has experienced an 18% increase while its rural population has expanded by less than 1%. These demographic changes, coupled with a decline in fishing license sales, focused the need to develop and increase fishing opportunities in and around urban areas. In 2005, the Kentucky Department of Fish and Wildlife Resources initiated a pilot urban fishing program aimed at providing urban residents with high quality fishing opportunities close to home. Five pilot lakes, located within four of Kentucky’s most populated counties, were selected to receive regular stockings of rainbow trout <em>Oncorhynchus mykiss</em>, channel catfish <em>Ictalurus punctatus</em>, largemouth bass <em>Micropterus salmoides</em>, and hybrid bluegill <em>Lepomis macrochirus </em>x <em>L. cyanellus</em>. Rainbow trout were stocked at each lake in April and October. Channel catfish, largemouth bass, and hybrid bluegill were stocked in May and June. Monthly stocking rates were 202 trout/ha, 34 channel catfish/ha, 12 largemouth bass/ha, and 81 hybrid bluegill/ha. Creel and angler attitude surveys were conducted at two of the pilot lakes from April through August 2006 to determine angler catch and satisfaction. Although fishing pressure at these two lakes was high, most anglers practiced catch and release. Catch rates were 1.03 fish/h at Stein Lake and 0.79 fish/h at Upper Sportsman’s Lake. Angler attitude survey results indicated that the majority of anglers interviewed were not aware of the program and did not know that regular fish stockings were occurring at the lakes. The typical angler fishing these lakes was a white male between the ages of 30 and 49, who was satisfied with his fishing experience regardless of the number or size of fish caught. Further studies need to be completed to compare results from this study, and to refine stocking and marketing techniques used in the program.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Size Structure ◽  
Management Strategies ◽  
Growth Increment ◽  
Stocking Rate ◽  
Lake Productivity ◽  
Growth Increments ◽  
The Many ◽  
Stocking Rates

<em>Abstract</em>.—Large fingerling (>175 mm total length) channel catfish<em> Ictalurus punctatus </em>are usually stocked to maintain put-grow-take channel catfish fisheries in small lakes and impoundments. Because these stockings are costly, stocking the appropriate number of fish is essential in minimizing costs and creating a desirable fishery. Appropriate stocking rates may vary among lakes due to differences in lake productivity, fishing and natural mortality of channel catfish, and other factors. Growth rate is responsive to the many processes that exist in lakes and is commonly density-dependent, making it a desirable parameter for assessing stocking rates. Two growth-increment indices were developed that compared size-specific growth increments within a population to statewide growth-increment percentiles for Missouri. These indices were used to determine responses in channel catfish growth rates in seven lakes where stocking rates had been either substantially reduced or increased. Sampling channel catfish populations after 3 years under the new stocking rate showed that growth increments and size structure did not substantially change. Both indices were correlated with growth increments and provided a way to assess growth relative to other populations. The lack of response of channel catfish populations to the new stocking rates suggests that these populations will not quickly respond to changes in stocking rate. The growth increment indices should assist managers in determining appropriate stocking rates and other management strategies.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Size Structure ◽  
Prey Availability ◽  
Relative Weight ◽  
Negative Influence ◽  
River Channel ◽  
Population Characteristics ◽  
Current Status ◽  
Platte River

<em>Abstract</em>.—Catfish angling is popular throughout North America and catfish are the most sought after fish species in the Platte River, Nebraska. However, catfish management in the Platte River is minimal as little is known about current populations. Our objective was to determine the current status of channel catfish <em>Ictalurus punctatus</em> populations in the central and lower Platte River. Specifically, we evaluated population characteristics including relative abundance, size structure and condition. The current Platte River channel catfish population appears to be comparable to many Midwestern rivers. Channel catfish populations in the central Platte River had lower relative abundances (CPUE [catch per unit effort] = 1.1 ± 0.2 versus 2.3 ± 0.2 fish/net-night using 25-mm hoop nets), higher condition (<em>W<sub>r</sub></em> [relative weight] = 92 ± 1.7 versus 83 ± 0.7 using all gears) and greater size structure (PSD [proportional size distribution] = 35 ± 7 versus 24 ± 3 using all gears) compared to lower Platte River channel catfish. Possible factors influencing differences in channel catfish population characteristics are prey availability, flow modifications, habitat characteristics, and angler exploitation. Water manipulation from the Loup River Power Canal was also identified as a possible negative influence on lower Platte River channel catfish populations because hydropeaking is likely creating a stressful environment. However, channel catfish in the central Platte River may have benefited from recent high flows that likely increased productivity and food availability in the central Platte River.

Risk of infestation of population by opisthorchiasis causative agent in the middle and lower current of the Iset river. influence of loimopotential of the focus of infestation on the risk values

2017 ◽  
pp. 52-56
Author(s):  
A.V. Ushakov ◽  
R.G. Fattakhov ◽  
T.F. Stepanova
Keyword(s):  
Causative Agent ◽  
Water Bodies ◽  
Risk Of Infection ◽  
Natural Focus ◽  
Opisthorchis Felineus ◽  
Large Water

The risk of infestation of the population by the opisthorchiasis causative agent in the middle and lower reaches of the Iset River was estimated. Areas with the highest risk of peoples infection by Opisthorchis felineus’ metacercaria are identified. These territories are confined to the zones of removal of the opisthorchiasis causative agent, which are river beds and large water bodies that constantly connect with rivers. Steady risk of infection of the population is determined by the loimopotential of the opisthorchiasis natural focus. The general infestation of juveniles fishes in the middle and lower current of the Iset River made 9,9 %, annuals – 21,5 %, two-year-olds – 19,5 %.

Preparation and characterization of collagen polypeptide chelated calcium from fish bone powder of channel catfish(Ictalurus punctatus)

2012 ◽  
Vol 36 (2) ◽  
pp. 314
Author(s):  
Jian-feng LU ◽  
Chang-wei MENG ◽  
Jin LI ◽  
Zi-hui GONG ◽  
Lin LIN ◽  
...  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Fish Bone ◽  
Bone Powder
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