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<p>The incorporation of co-cultures of macroalgae and bivalves has been proposed as a relevant diversification alternative with benefits for biomass production in aquaculture. However, knowing the optimal biomass proportion is required to maximize the growth of both organisms in co-culture. The De Wit replacement series methodology was designed to identify the interspecific and/or intraspecific interaction between two organisms co-cultured at different biomass proportions. Thus, the proportion at which a synergistic interaction occurs can be identified as the optimal biomass combination to maximize the growth of two species in a co-culture system. Here, we assessed if the De Wit replacement series method was suitable for determining the optimal initial biomass proportions in four separate macroalga:bivalve co-culture experiments (1, <i>Chondracanthus chamissoi</i>:<i>Magallana gigas</i>; 2, <i>Sarcopeltis skottsbergii</i>:<i>M. gigas</i>; 3, <i>C. chamissoi</i>:<i>Mytilus chilensis</i>; and 4, <i>Gracilaria chilensis</i>:<i>M. chilensis</i>), for 28–30&#xa0;days, under laboratory conditions. We observed a synergistic interaction between macroalgae and bivalves in all experiments, resulting in an optimal initial biomass at 2:1 for experiment 1, 3 and 4, and 1:1 for experiment 2. Nevertheless, these results were related to the rapid growth of macroalgae compared to bivalves, with the macroalgae showing 2–8 times greater growth rates than the bivalves. Therefore, more research is needed to evaluate the benefits of co-cultures for the production of bivalve biomass, including long-term experiments (&gt; 30&#xa0;days) in laboratory and field conditions.</p>

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The De Wit replacement series method for determining optimal biomass proportion for macroalga and bivalve co-cultures in laboratory conditions

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Pablo P. Leal,
  • Daniela Uribe,
  • Karla Álvarez

摘要

The incorporation of co-cultures of macroalgae and bivalves has been proposed as a relevant diversification alternative with benefits for biomass production in aquaculture. However, knowing the optimal biomass proportion is required to maximize the growth of both organisms in co-culture. The De Wit replacement series methodology was designed to identify the interspecific and/or intraspecific interaction between two organisms co-cultured at different biomass proportions. Thus, the proportion at which a synergistic interaction occurs can be identified as the optimal biomass combination to maximize the growth of two species in a co-culture system. Here, we assessed if the De Wit replacement series method was suitable for determining the optimal initial biomass proportions in four separate macroalga:bivalve co-culture experiments (1, Chondracanthus chamissoi:Magallana gigas; 2, Sarcopeltis skottsbergii:M. gigas; 3, C. chamissoi:Mytilus chilensis; and 4, Gracilaria chilensis:M. chilensis), for 28–30 days, under laboratory conditions. We observed a synergistic interaction between macroalgae and bivalves in all experiments, resulting in an optimal initial biomass at 2:1 for experiment 1, 3 and 4, and 1:1 for experiment 2. Nevertheless, these results were related to the rapid growth of macroalgae compared to bivalves, with the macroalgae showing 2–8 times greater growth rates than the bivalves. Therefore, more research is needed to evaluate the benefits of co-cultures for the production of bivalve biomass, including long-term experiments (> 30 days) in laboratory and field conditions.