Impact of Minimum Dissolved Oxygen Concentration on Grow‐Out Performance of Blue Catfish with Comparison to Channel Catfish

Torrans, Les; Ott, Brian D.; Bosworth, Brian G.

doi:10.1080/15222055.2012.678566

Cited by 14 publications

(20 citation statements)

References 39 publications

(4 reference statements)

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“…The same general effect has been demonstrated with Blue Catfish I. furcatus (Torrans et al. ) and hybrid catfish (female Channel Catfish × male Blue Catfish; Green et al. ), although hybrid catfish are a bit more tolerant of low DO than are Channel Catfish (Green and Rawles ; Torrans et al.…”

supporting

confidence: 55%

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Effects of Density on Production of Hybrid Catfish in Intensively Aerated Earthen Ponds where Dissolved Oxygen is Not a Limiting Factor

Torrans¹,

Ott²

2019

N American J Aquac

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Research has demonstrated that by maintaining the minimum dissolved oxygen (DO) concentration in earthen ponds at or above 3.0 ppm, feed intake and growth of Channel Catfish Ictalurus punctatus, Blue Catfish I. furcatus, and hybrid catfish (female Channel Catfish × male Blue Catfish) may be doubled relative to those achieved with the oxygen management regimes typically used on commercial catfish farms. In earlier studies using only emergency aeration or low levels of fixed aeration, the direct effect of stocking rate has been confounded by lower morning DO concentrations in ponds stocked at higher densities due to higher feed input and fish biomass. Although higher stocking rates in those studies did produce greater yields, individual fish growth and feed intake may have been impacted by lower DO levels while appearing to be a direct density effect. In this study, production of hybrid catfish, which were fed daily to satiation in earthen ponds with no water exchange, was compared at low (5,000 fish/acre) and high (20,000 fish/acre) stocking rates while using controlled intensive aeration to maintain a minimum DO over 3.0 ppm in all ponds through the study. We achieved an average net production of 27,704 lb/acre at the higher stocking rate compared to 10,176 lb/acre at the lower stocking rate. Although this is the highest yield reported thus far in traditional static‐water earthen ponds in the southern USA, it may not be the maximum production possible. The average weight of harvested fish was higher at the lower density (2.2 lb versus 1.6 lb), but the feed conversion ratio was identical (1.8) at the two densities. Our data indicate that when morning DO is maintained above limiting concentrations, other factors such as direct density interactions (aggression and/or inhibitory pheromonal feedback) and/or water quality variables unrelated to morning DO—specifically un‐ionized ammonia—may play a role in catfish feed intake and growth but not food conversion.

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supporting

confidence: 55%

“…; Torrans et al. , ) minimum DO concentrations this high should have no impact on feed intake, growth, or production in either treatment. Clearly, some factor or multiple factors other than minimum DO concentration impacted individual fish feed intake and growth but not FCR or relative size variation (i.e., CV) at the higher fish density.…”

Section: Resultsmentioning

confidence: 95%

Effects of Density on Production of Hybrid Catfish in Intensively Aerated Earthen Ponds where Dissolved Oxygen is Not a Limiting Factor

Torrans¹,

Ott²

2019

N American J Aquac

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“…In both years of this study, FCRs were not affected by minimum DO concentrations. This was also seen by Torrans (2005Torrans ( , 2008 with Channel Catfish; Torrans et al (2012) with Channel and Blue Catfish; and both Green and Rawles (2011) and Green et al (2012) with Channel and hybrid catfish. Reduced feed intake and decreased growth under moderate hypoxia does not affect FCR in numerous fish species, including Rainbow Trout (Glencross 2009) and Nile Tilapia (Tran-Duy et al 2012), a finding that is presumed to result from decreased energy requirements when feed is restricted.…”

Section: Discussionmentioning

confidence: 72%

“…However, if the minimum DO concentration is below 3 ppm, these factors are impacted (Green and Rawles 2011); and at DO concentrations of 1.6 ppm, feed 486 TORRANS ET AL. (Torrans 2012;Torrans et al 2012).…”

mentioning

confidence: 99%

Impact of Minimum Daily Dissolved Oxygen Concentration on Production Performance of Hybrid Female Channel Catfish × Male Blue Catfish

Torrans¹,

Ott²,

Bosworth³

2015

N American J Aquac

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Hybrid catfish (♀ Channel Catfish Ictalurus punctatus × ♂ Blue Catfish I. furcatus) were reared as single‐batch crops during the growing season (June–September) of two years under two different dissolved oxygen (DO) regimes each year: (1) a high‐DO (control) treatment with minimum daily DO maintained above 3.8 ppm in both years and (2) a low‐DO (test) treatment with minimum DO maintained at 1.6 ppm in the first year and 1.3 ppm in the second year. Fish were fed daily to apparent satiation with a 32% protein commercial feed and harvested each year. In both years, dissolved oxygen concentration significantly impacted gross and net production, final fish weight, and mean fish weight gain due to reduced feed intake. Feed intake was reduced in the low‐DO treatment by 26.6% in year 1 and 29.2% in year 2. Food conversion ratios averaged 1.83 overall and were not affected by minimum DO. Fish in high‐DO treatments gained an average of 44% more weight (1.50 lb/fish) than fish in low‐DO treatments (1.04 lb/fish). Initial weight at stocking also had a significant impact on weight gain: fish stocked at a 0.16‐lb average weight (year 2) gained 37% more weight than fish stocked at a 0.11‐lb average weight (year 1), even though the stocking rate of the larger fish was 50% higher. Hybrid catfish had less reduction in feed intake at reduced DO compared with reported values for Channel Catfish and Blue Catfish.

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“…This correlates well to the decreased growth observed in channel catfish (Ciaramella and others ). Stressful environmental temperatures and DO concentrations are well documented to hinder growth in fish (Tucker and Robinson ; Buentello and others ; Torrans ; Handeland and others ; Tran‐Duy and others ; Lakani and others ; Torrans and others ; Arnold and others ; Stewart and others ). Decreased fish growth will ultimately translate into decreased fillet yields and income.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Sequential Environmental and Harvest Stressors on the Sensory Characteristics of Cultured Channel Catfish (Ictalurus Punctatus) Fillets

Ciaramella

Kim

Avery

et al. 2016

Journal of Food Science

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Stress during fish culture alters physiological homeostasis and affects fillet quality. Maintenance of high-quality seafood is important to ensure the production of a marketable product. This study assessed how sequential stressors affect the sensory and quality characteristics of catfish (Ictalurus punctatus) fillets. Three stress trials were conducted where temperature (25 or 33 °C) and dissolved oxygen (DO, approximately 2.5 or >5 mg/L) were manipulated followed by socking and transport stress. After each stage of harvest (environmental stress, socking, and transport), fillet yield, consumer acceptability, descriptive evaluation, cook loss, tenderness, and pH were evaluated. Fillet yield decreased with increasing severity of environmental stress. Fillets from the severe stress treatment (33 °C, approximately 2.5 mg/L) received the highest acceptability scores (P < 0.05). Control fillets (25 °C, >5 mg/L) were the least acceptable (P < 0.05). Increased intensity of less favorable flavor attributes commonly associated with catfish resulted in the differences in acceptability among treatments. As fish progressed through the harvest event, cook loss decreased, tenderness increased, and pH increased, indicating that stress induced textural changes. The data suggest that although environmental stress results in slight changes in flavor attributes, its effects on acceptability are minor with fillets from all treatments still liked (>6 on a 9 point scale). Socking and transport were identified to positively affect textural characteristics of catfish fillets. Although the effects observed were not likely to negatively impact consumer acceptance, a strict management plan should be followed to maintain consistency in the product and avoid changes in stressors that might alter quality more drastically.

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Impact of Minimum Dissolved Oxygen Concentration on Grow‐Out Performance of Blue Catfish with Comparison to Channel Catfish

Cited by 14 publications

References 39 publications

Effects of Density on Production of Hybrid Catfish in Intensively Aerated Earthen Ponds where Dissolved Oxygen is Not a Limiting Factor

Effects of Density on Production of Hybrid Catfish in Intensively Aerated Earthen Ponds where Dissolved Oxygen is Not a Limiting Factor

Impact of Minimum Daily Dissolved Oxygen Concentration on Production Performance of Hybrid Female Channel Catfish × Male Blue Catfish

The Effects of Sequential Environmental and Harvest Stressors on the Sensory Characteristics of Cultured Channel Catfish (Ictalurus Punctatus) Fillets

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