A 'more efficient' kelp farming technique produced less kelp per rope
WHAT THE EVIDENCE SAYS
Conventional seeded rope yielded 3.8 kg kelp per cultivation meter versus 1.8–2.9 kg for different splice intervals. But splice methods improved harvested biomass per meter of seeded twine by 36–248%; the overall absolute-yield comparison did not reach p<0.05.
WHY IT MATTERS / OUR READ
Efficiency without specifying the unit can mislead both managers and investors. Compare materials, labor and reliable absolute production before declaring a lower-footprint method ecologically or commercially superior.
CAVEATS / UNCERTAINTY
Small replicate counts (n=3–4), one site and a season; seeded twine material and starting coverage varied. Commercial lifecycle impacts and full cost-effectiveness were not established.
SOURCE
Journal of Applied Phycology — Aldridge et al. (2026)
View original evidence ↗
Norway's splice-seeding trial reverses depending on whether the denominator is rope or seed twine.
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