What question did this study set out to answer?

To assess whether whole-body tissue RNA–DNA ratios serve as reliable indicators of recent nutritional intake, starvation, and growth rates in golden shiners.

December 1, 1970Journal of the Fisheries Research Board of Canada

RNA–DNA Ratios as Indicators of Recent Growth Rates of a Fish

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Authors

FBFrank J. BulowSouthern Illinois University Carbondale

Discussion

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Implication

Experimental study demonstrates that tissue RNA–DNA ratios reflect nutritional intake and weight shifts in golden shiners, indicating their utility as rapid bioindicators of recent growth.

Key Points

To assess whether whole-body tissue RNA–DNA ratios serve as reliable indicators of recent nutritional intake, starvation, and growth rates in golden shiners.
Golden shiners (Notemigonus crysoleucas) were fed at daily rates of 0%, 2%, and 6% of body weight for durations of 15, 30, and 45 days.
A starvation and refeeding trial was conducted by withholding food for 14 days followed by 6 days of resumed feeding.
Mean RNA–DNA ratios were measured from defatted, eviscerated fish tissues and correlated with percentage changes in body weight.
Feeding at 0%, 2%, and 6% body weight for 15 days produced mean RNA–DNA ratios of 2.18, 2.83, and 4.32, which corresponded directly to mean weight changes of −16.1%, 2.2%, and 21.3%.
Food deprivation for 30 and 45 days lowered mean ratios to 1.66 and 1.36 (weight losses of 20.6% and 35.6%), whereas long-term feeding at 2% and 6% leveled off or reduced ratios (3.03–3.91) despite ongoing weight gains (19.9%–90.9%).
During acute deprivation, mean ratios dropped from 3.56 at day 4 to 2.30 at day 14, but rapidly rebounded to 3.45 on day 1 and 4.93–5.73 on days 2–6 of refeeding due to changes in RNA concentration.

Cite This Study

Frank J. Bulow (1970) studied this question.

synapsesocial.com/papers/6a8bb96595f0361a9ebed9d2 https://doi.org/10.1139/f70-262

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December 1, 1970Journal of the Fisheries Research Board of Canada

RNA–DNA Ratios as Indicators of Recent Growth Rates of a Fish

View Full Paper

Ask AI

Bookmark

Authors

FBFrank J. BulowSouthern Illinois University Carbondale

Discussion

Member takes

Implication

Experimental study demonstrates that tissue RNA–DNA ratios reflect nutritional intake and weight shifts in golden shiners, indicating their utility as rapid bioindicators of recent growth.

Key Points

To assess whether whole-body tissue RNA–DNA ratios serve as reliable indicators of recent nutritional intake, starvation, and growth rates in golden shiners.
Golden shiners (Notemigonus crysoleucas) were fed at daily rates of 0%, 2%, and 6% of body weight for durations of 15, 30, and 45 days.
A starvation and refeeding trial was conducted by withholding food for 14 days followed by 6 days of resumed feeding.
Mean RNA–DNA ratios were measured from defatted, eviscerated fish tissues and correlated with percentage changes in body weight.
Feeding at 0%, 2%, and 6% body weight for 15 days produced mean RNA–DNA ratios of 2.18, 2.83, and 4.32, which corresponded directly to mean weight changes of −16.1%, 2.2%, and 21.3%.
Food deprivation for 30 and 45 days lowered mean ratios to 1.66 and 1.36 (weight losses of 20.6% and 35.6%), whereas long-term feeding at 2% and 6% leveled off or reduced ratios (3.03–3.91) despite ongoing weight gains (19.9%–90.9%).
During acute deprivation, mean ratios dropped from 3.56 at day 4 to 2.30 at day 14, but rapidly rebounded to 3.45 on day 1 and 4.93–5.73 on days 2–6 of refeeding due to changes in RNA concentration.

Cite This Study

Frank J. Bulow (1970) studied this question.

synapsesocial.com/papers/6a8bb96595f0361a9ebed9d2 https://doi.org/10.1139/f70-262

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