Characteristics of Commercially Harvested Channel Catfish From Areas of the Mississippi River Along Illinois: Commercial Harvest and the 15.0—in Minimum Length Limit

Raibley, Paul T.; Jahn, Larry A.

doi:10.1080/02705060.1991.9665316

Cited by 5 publications

(8 citation statements)

References 9 publications

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Section: Methodsmentioning

confidence: 99%

“…The maximum age of Channel Catfish was set as the oldest observed fish in the data set (15 years), and the maximum size (asymptotic length [L ∞ ]) was set at 810 mm TL (the largest known Channel Catfish captured in the San Juan River). Because natural mortality rates of Channel Catfish in the San Juan River were unknown, we used a range of estimated conditional natural mortality rates (cm; i.e., 0.15, 0.20, and 0.25; from Simco and Cross 1966;Railbey and Jahn 1991;and Slipke et al 2002;respectively). We assumed that females made up 50% of the population (Slipke et al 2002), age at sexual maturity was 3 years (Helms 1975), and the percentage of females that spawned annually was 10% for age 3, 50% for age 4, and 75% for age 5 and older (Helms 1975).…”

Section: Methodsmentioning

confidence: 99%

“…The CPUE of Channel Catfish during standardized monitoring was variable over this time period, with no obvious temporal trends; however, the seven highest annual CPUEs occurred after intensive nonnative fish removal began in 2006. Additionally, both the total number of Channel Catfish removed across all efforts and the CPUE during standardized monitoring were more variable over the most recent 10 years of the data set (coefficient of variation [CV] in CPUE = 45%; 2006-2015) compared to the period before intensive nonnative removal efforts began (CV = 37%;1991-2005.…”

Section: Observed Temporal Variation In the Channel Catfish Populationmentioning

confidence: 99%

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Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Pennock

Durst

Duran

et al. 2018

N American J Fish Manag

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Human transformation of aquatic systems and the introduction of nonnative species increasingly threaten the persistence of imperiled freshwater fishes. In response, large‐scale mechanical removal of nonnative fishes has been implemented throughout parts of the Colorado River basin to aid recovery of endangered fishes, but the effects of these efforts can be difficult to quantify. Fisheries population models for predicting outcomes of harvest regulations have been widely used to prevent overfishing of commercial and game stocks. Here, we used population models to investigate size‐specific removal efforts needed to overfish a nonnative population of Channel Catfish Ictalurus punctatus and thereby aid recovery of endangered fishes in the San Juan River, New Mexico and Utah. The minimum size of fish that were efficiently captured with electrofishing gear was 280 mm TL, and annual removal rates increased with fish size, ranging from 0.10 for 200‐mm fish to 0.44 for 600‐mm fish. Model results suggested that removal rates should be increased from 0.14 to a range of 0.21–0.34 to cause growth overfishing and should be increased to a range of 0.26–0.29 to cause recruitment overfishing at a minimum electrofishing size limit of 280 mm TL. However, model results indicated that overall population abundance and biomass are being substantially reduced compared to an unmanaged population. In concordance, long‐term monitoring data from 1991 to 2015 demonstrated a decrease in Channel Catfish TL and mass as well as an increase in catch rate variability since removal efforts intensified in 2006. Overall, current rates of removal will probably not achieve collapse of the nonnative Channel Catfish population in the San Juan River, but the reduction in size structure indicates that the population has responded to these efforts.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Observed Temporal Variation In the Channel Catfish Populationmentioning

confidence: 99%

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Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Pennock

Durst

Duran

et al. 2018

N American J Fish Manag

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“…Conditional nat-ural mortality (cm) ranged from 19% to 24% when estimated using the Quinn and Deriso (1999), Hoenig (1983), and Peterson and Wroblewski (1984) natural mortality estimators in FAST. Simco and Cross (1966) found annual mortality rates of 22% for channel catfish in ponds (no fishing), and Raibley and Jahn (1991) reported a cm of less than 15% in the UMR for channel catfish greater than 381 mm. We chose a cm of 22% to represent a midrange of reported and estimated values, and modeled over a range of conditional fishing mortalities to encompass the ranges of exploitation that were likely being exerted on the fishery.…”

Section: Methodsmentioning

confidence: 99%

Use of the Spawning Potential Ratio for the Upper Mississippi River Channel Catfish Fishery

Slipke

Martin

Pitlo

et al. 2002

North American Journal of Fisheries Management

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We used simulation modeling to identify the conditions of growth and recruitment overfishing that were associated with a decline in the Upper Mississippi River (UMR) commercial fishery for channel catfish Ictalurus punctatus prior to 1984, when the minimum length limit was increased from 330 to 381 mm total length. The spawning potential ratio (SPR)—an index developed by marine fisheries scientists to identify and prevent recruitment overfishing—is simply a ratio of the average lifetime production of mature eggs per recruit in a fished population to what it would have been if the population had never been fished. We identified a critical minimum SPR that could be used as a biological reference point in the management of a highly exploited channel catfish fishery. Simulation modeling predicted that the SPR, which ranged from 3% to 12% under the 330‐mm minimum length limit, would increase to 10–20% with a 381‐mm minimum length limit for exploitation rates of 45–80%. Our predicted increase in the SPR corresponded well to the three‐ to fourfold increase in age‐0 channel catfish abundance. Prior to the higher length limit, the reduction in commercial yield was primarily due to recruitment overfishing and not growth overfishing. The critical minimum SPR of 10–20% for the UMR channel catfish population is lower than the critical levels of 20–30% typically reported for pelagic marine species and is likely due to the life history characteristics and spawning strategy of channel catfish.

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“…Collection of spermatozoa from male blue catfish is a lethal procedure, requiring the surgical removal and subsequent maceration of the testes (Bart and Dunham 1990). In contrast, channel catfish reach sexual maturity at a younger age (3 years) and smaller size (Raibley and Jahn 1991) and females can be stripped of their eggs. Because of the time needed for a male blue catfish to reach sexual maturity and the fact that it can only be used in the production of F 1 hybrids once, the investment in male broodstock is substantial compared with that in channel catfish broodstock.…”

mentioning

confidence: 99%

Results of First Experiments on Application of Electrical Stimulation of Blue Catfish Testes for Production of Channel Catfish × Blue Catfish Hybrids

2006

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Characteristics of Commercially Harvested Channel Catfish From Areas of the Mississippi River Along Illinois: Commercial Harvest and the 15.0—in Minimum Length Limit

Cited by 5 publications

References 9 publications

Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Predicted and Observed Responses of a Nonnative Channel Catfish Population Following Managed Removal to Aid the Recovery of Endangered Fishes

Use of the Spawning Potential Ratio for the Upper Mississippi River Channel Catfish Fishery

Results of First Experiments on Application of Electrical Stimulation of Blue Catfish Testes for Production of Channel Catfish × Blue Catfish Hybrids

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