RNA-DNA ratios as indicators of short-term growth in channel catfish

Sable, W. Daniel

doi:10.31274/rtd-180817-2564

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…Changes in nucleic acid related to growth have been reported earlier (Mustafa & Jafri 1977). RNA/DNA ratio serves as an index of growth per cell and higher ratios indicate growth increment (Sable 1974). It has been reported that the ratio of ribonucleic acid concentration in body tissues can be used to monitor protein synthesis activity and growth in fish (Bulow 1970; Khan & Jafri 1981).…”

Section: Discussionmentioning

confidence: 99%

Effects of paddy straw and sugarcane bagasse on water quality, bacterial biofilm production and growth and survival of rohu, Labeo rohita (Hamilton)

et al. 2005

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Sugarcane bagasse (T1), paddy straw (T2) and their mixture (T3) were added to mud‐bottomed, manured cement tanks in triplicate to study the effect on bacterial biofilm production and growth and survival of rohu, Labeo rohita. All tanks were stocked with fingerling rohu at 10 000 ha−1. The total plate count (TPC) of bacteria in water and on substrate did not differ significantly between treatments. The mean phytoplankton and zooplankton density in water was the highest in T2, followed by T3 and T1. The growth of fish was significantly (P<0.05) higher in T2 and T3 compared with T1. Significantly higher RNA values were recorded in T2 and T3 compared with T1. Similarly, T2 and T3 registered higher DNA values than T1. RNA:DNA ratio was higher in T2 compared with T1. However, T3 did not differ significantly from T1 and T2. Both intestinal and hepatopancreatic protease and lipase activity was higher in T1 and T2 compared with T3 and both differ significantly from T1. Intestinal amylase activity was higher in T2 and T3 compared with T1, whereas hepatopancreatic amylase activity was higher in T2 compared with T1 and T3. The results demonstrated that production of L. rohita can be significantly increased by the introduction of biodegradable substrates into culture systems where fertilization is employed.

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Section: Discussionmentioning

confidence: 99%

Effects of paddy straw and sugarcane bagasse on water quality, bacterial biofilm production and growth and survival of rohu, Labeo rohita (Hamilton)

et al. 2005

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“…The ratio RNA/DNA is considered to be an index of nutritional status and growth of fish (Sable 1974; Clemmensen 1987; Nandeesha et al . 1998).…”

Section: Discussionmentioning

confidence: 99%

Further studies on the use of mixed feeding schedules with plant- and animal-based diets for common carp Cyprinus carpio (Linnaeus)

Nandeesha¹,

Gangadhara²,

Manissery³

2002

Aquaculture Research

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A growth trial was conducted on common carp Cyprinus carpio (L.) fry in cement tanks for 100 days in order to test the efficacy of mixed feeding schedules. The diets tested were a fishmeal-based diet (diet D with 30.9% protein) and three Colocasia esculenta-based diets (diet A with 16.7% protein, diet B with 19.7% protein and diet C with 25.8% protein) separately and in three mixed feeding combinations of diet A, B and C with D on alternate 2 days (2A/2D, 2B/2D and 2C/2D, where the numeral indicates the number of days that the particular diet was offered continuously). The results revealed no difference in growth of common carp fed the plant protein-based diets A and B (P > 0.05). Although the fish fed on diets C and D and mixed feeding combinations 2A/2D and 2B/2D performed comparably and higher than those on diets A and B, the schedule 2C/2D resulted in the highest final weight. Specific growth rate, feed conversion ratio and RNA/DNA ratios were the highest in the 2C/2D schedule. Among the mixed feeding schedules, the highest saving in protein and cost was recorded with the 2A/2D schedule, followed by 2B/2D and 2C/2D. An increase in dietary protein led to decreased protein and increased fat deposition in the carcass. An increasing trend in the protease and amylase activities was recorded with increased dietary protein level. The study highlighted the efficient utilization of plant proteins by common carp under mixed feeding schedules.

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“…A number of indexes have been proposed for monitoring growth, feeding, reproduction, energy storage, and condition of fish populations. RNA-DNA ratios (RNA/DNA) have been demonstrated to be reliable indicators of growth rate of experimental and natural populations of fishes (Bulow, 1970;Nasiri, 1972;Haines, 1973;Sable, 1974;Spigarelli & Smith, 1976;Bulow et al, 1978). The liver-somatic index (LSI) has been used as an indicator of growth (Bulow & Coburn, 1976), daily food intake (Heidinger & Crawford, 1977), and energy storage (Bulow et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in RNA–DNA ratios and in indicators of feeding, reproduction, energy storage, and condition in a population of bluegill, Lepomis macrochirus Rafinesque

Bulow

Zeman

Winningham

et al. 1981

Journal of Fish Biology

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Liver and epaxial muscle RNA concentrations and RNA-DNA ratios (RNA/DNA) of bluegill Lepomis macrochirus from a central Tennessee lake were maximum in the spring, low during the summer, high again in the fall, and low during the winter. Liver-somatic indexes and DNA concentrations indicated that liver cell volume and energy storage varied seasonally and were lowest during late spring and summer. Seasonal variations in gonosomatic indexes were typical of this species, and RNA/DNA decreased as gonads matured during the spring. RNA/DNA and energy storage in the liver decreased during the major spawning season. Seasonal variations in food consumption may have effected seasonal growth and energy storage. However, a summer depression in RNA/DNA may have been more closely associated with the effects of thermal stratification and dissolved oxygen stress.

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RNA-DNA ratios as indicators of short-term growth in channel catfish

Cited by 3 publications

References 18 publications

Effects of paddy straw and sugarcane bagasse on water quality, bacterial biofilm production and growth and survival of rohu, Labeo rohita (Hamilton)

Effects of paddy straw and sugarcane bagasse on water quality, bacterial biofilm production and growth and survival of rohu, Labeo rohita (Hamilton)

Further studies on the use of mixed feeding schedules with plant- and animal-based diets for common carp Cyprinus carpio (Linnaeus)

Seasonal variations in RNA–DNA ratios and in indicators of feeding, reproduction, energy storage, and condition in a population of bluegill, Lepomis macrochirus Rafinesque

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