Location: Warmwater Aquaculture Research UnitTitle: Effect of strain and ESC vaccine-booster on production and processing traits of the Delta Select and Delta Control strains of channel catfish, Ictalurus punctatus
|Waldbieser, Geoffrey - Geoff|
|WISE, DAVID - Mississippi State University|
|KUMAR, GANESH - Mississippi State University|
|LOURENCO, DANIELA - University Of Georgia|
|GARCIA, ANDRE - University Of Georgia|
|TORRANS, LES - Retired ARS Employee|
Submitted to: Journal of the World Aquaculture Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/6/2019
Publication Date: N/A
Interpretive Summary: The mission of the Warmwater Aquaculture Research Unit (WARU), USDA-ARS, includes development of improved catfish germplasm for release to U.S. catfish farmers. A channel catfish strain referred to as the Delta Select was developed by three generations of selection for increased growth and carcass yield. Progeny from the Delta Select strain and the Delta Control strain (a randomly bred strain from the same base population as the Delta Selects) were compared for important production traits in 3 trials conducted in earthen ponds. In Trial 1 fingerlings from each strain were reared in tanks, tagged, stocked communally in replicate 1 acre ponds and fed daily to satiation. For Trials 2 and 3, fingerlings from each strain were produced by stocking fry in fertilized ponds, and resulting fingerlings were vaccinated for ESC at 3 months post-hatch. The second growing season the fingerlings were stocked in replicate 1 acre ponds (Trial 2) or replicate 1/4 acre ponds (Trial 3) and fed to satiation once daily. In Trial 2, fish in about half the ponds from each strain were given an ESC vaccine booster at 13 months post-hatch. At the end of the second growing season fish were harvested and measured for growth and carcass yield (all 3 trials) and survival and FCR were estimated for Trials 2 and 3. Although results varied some among trials, Delta Select strain fish had faster growth and better carcass yield than Delta Control strain fish, but feed efficiency and survival were similar for the two strains. The vaccine booster used in Trial 2 did not improve survival or feed efficiency. Release of the Delta Select strain of channel catfish should improve production efficiency of U.S. catfish farmers by providing a strain of fish with improved growth and carcass yield.
Technical Abstract: A channel catfish strain referred to as the Delta Select (DS) was developed by three generations of selection for increased growth and carcass yield. Progeny from DS and the Delta Control (DC) strain (a randomly bred strain from the same base population as DS) were compared in three trials. Trial 1– unvaccinated fingerlings from each strain were reared in tanks, tagged, stocked communally in replicate ponds at 12,500 head/ha, and fed daily. Fish were measured for sex, weight and carcass yield at the end of the study. Trial 2- fingerlings from each strain were produced by stocking fry in fertilized ponds. Resulting fingerlings were vaccinated for ESC at 3 months post-hatch, harvested and pooled by strain over-winter, restocked at 11 months post-hatch in replicate 0.4-ha ponds at 20,000 head/ha, and fed once daily. Fish in about half the ponds of each strain were given an ESC vaccine-booster at 13 months post-hatch. Average stocking weight, average harvest weight, survival, FCR and carcass yield were measured at the end of the second growing season. Trial 3– same procedures as Trial 2, except fish were raised in replicate 0.1-ha ponds (3 ponds/strain) with no vaccine-booster. In Trial 1 DS were larger at stocking, larger at harvest, and had higher carcass yield than DC; in Trial 2 DS were larger at harvest, had better survival, and higher production/ha than DC. Vaccine-booster had a positive effect on carcass yield, but not other traits. DS and DC were not different for any traits in Trial 3. Although outcome varied among trials, the overall results indicate that a single vaccination provides long-term protection, DS grew faster than DC, and DS had higher carcass yield than DC when reared communally.