![]() ![]() ![]() Channel Catfish in the SBR were highly mobile. Angler exploitation was estimated at 2.3%. Angler return data indicated that 36% of fish reported by anglers were harvested, but only 6% of tags were returned. Annual mortality rate was estimated at 19.1%. The oldest fish aged was a 19-year-old female. Channel Cat- fish CPUE and size structure increased downstream, and sexually dimorphic growth was documented. ![]() Multiple-census models and CPUE data were employed to estimate abundance. Lapillar otoliths were collected during September samples for growth analyses. Channel Catfish were measured for TL, fin-clipped, and tagged with a T-bar anchor tag. Five pools were sampled during June–September in 2012–2017. Population growth, annual mortality, angler exploitation, and angler-reported movement were also assessed. This study focuses on hoop-net assessments of the species’ size structure and abundance across a longitudinal continuum of the fifth-order, low- to moderate-gradient South Branch of the Potomac River (SBR). For the North Island, the ESAs with the largest longfin commercial catches (ESAs AA, AD, and AH) all showed declines of 25-75% in CPUE indices from 1990-91 to 2003-04, with the largest reduction occurring in Rangitikei-Wanganui (ESA AH).Riverine Channel Catfish Ictalurus punctatus are largely unregulated in West Virginia, while recreational angling interest for the species is emerging. The only reliable estimates of relative abundance are based on CPUE data. Nevertheless, results from 2007–08 show that, with the exception of 1997-98, the number of longfin elvers at two of the main monitoring stations (Karapiro and Matahina dams) was the highest that has been recorded in the past 16 years. Nevertheless, recruitment data, CPUE indices, and information on spawner escapement allow for a cautioned assessment to be made of longfin and shortfin stock status.įrom the age composition of juvenile eels there is evidence that glass eel recruitment has declined in two North Island and three South Island waters, and there is anecdotal evidence that glass eel runs are now substantially smaller in the Waikato River that in the 1970’s. The Working Group recognises that there are no stock assessments on which to base specific recommendations on longfin catch levels. ![]()
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