Consider the following argument:
A commercial aquaculture firm plans to replace traditional fishmeal with a novel kelp-based bio-feed in its ocean net-pen salmon farms. Management reasons that because the bio-feed increased salmon growth rates by 15 percent in land-based tank trials, switching to the bio-feed in ocean net-pen operations will significantly increase the farm's overall annual net profits.
Statement: The argument depends on the unstated assumption that salmon raised in ocean net-pens absorb nutrients from the kelp-based bio-feed with sufficient efficiency to maintain a growth advantage comparable to that observed in land-based tanks.
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The statement is TRUE because the argument relies on the necessary assumption that growth enhancements observed in land-based trials will translate to open ocean net-pen environments.
The argument projects higher profitability based entirely on growth rate gains observed in land-based tank trials. For this extrapolation to hold, the author must assume that salmon in ocean net-pens can digest and absorb the bio-feed effectively enough to reproduce these growth gains. Negating this statement eliminates the expected benefit, causing the conclusion to fail.
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Identifying Unstated Assumptions (Environment Transfer & Negation Test)