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Probiotic supplementation in aquaculture improves fish growth, but timing matters. A Bayesian growth model revealed that continuous probiotic use (56-day exposure) sustained better growth rates in red drum compared to short-term use (28-day exposure).

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Area of Science:

  • Aquaculture
  • Fish nutrition
  • Microbiology

Background:

  • Probiotic use in aquaculture is growing for enhanced fish performance.
  • Standard statistical methods may not fully capture time-dependent probiotic effects on fish growth.
  • Red drum (Sciaenops ocellatus) growth responses to probiotics administered via water were investigated.

Purpose of the Study:

  • To evaluate the impact of different durations of probiotic supplementation on red drum growth.
  • To compare standard statistical analyses with a mechanistic Bayesian growth model for assessing probiotic efficacy.
  • To understand the time-dependent dynamics of probiotic effects on fish growth rates.

Main Methods:

  • Juvenile red drum were subjected to three treatments: control, 28-day probiotic exposure, and 56-day probiotic exposure.
  • Probiotic PrimaLac® was administered directly to tank water.
  • Growth was assessed using conventional ANOVA and a mechanistic hierarchical Bayesian growth model.

Main Results:

  • Both probiotic exposure durations improved growth compared to controls, but standard ANOVA could not differentiate between them.
  • The Bayesian model revealed higher early growth rates and identified reduced growth in the 28-day treatment after supplementation ceased.
  • The 56-day treatment demonstrated a more persistent positive growth response under continuous probiotic administration.

Conclusions:

  • Mechanistic hierarchical Bayesian modeling offers a superior framework for analyzing time-dependent growth dynamics in aquaculture probiotics.
  • Continuous probiotic supplementation (56 days) is more effective for sustained growth in red drum than short-term (28 days) exposure.
  • Further research integrating microbiological analyses is needed to link probiotic mechanisms to observed growth effects.