Overfishing of herbivorous fish such as parrotfish lets algae overgrow and weakens coral reefs.

the verdict

INSUFFICIENT LEANING

Recorded sources

7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Overfishing of herbivorous fish such as parrotfish lets algae overgrow and weakens coral reefs?

Unclear. Several sources partially support the claim: Caribbean overfishing of large herbivorous fish has been linked to increased algal growth, and parrotfish grazing is described as controlling algae on reefs. However, the items do not fully establish that overfishing of parrotfish specifically causes algae to overgrow and weaken coral reefs, with some findings complicating the biomass mechanism.

Verdict: PARTIAL LEAN · 7 sources for, 0 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 7

Coral reef fish

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Coral reef fish. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Coral_reef_fish

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More for · 6

Overfishing and the ecological impacts of extirpating large parrotfish from Caribbean coral reefs

2020

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Shantz, A. A., Ladd, M. C., & Burkepile, D. E. (2020). Overfishing and the ecological impacts of extirpating large parrotfish from Caribbean coral reefs. doi.org. https://doi.org/10.1002/ecm.1403

Effects of simulated eutrophication and overfishing on coral reef invertebrates, algae and microbes in the Red Sea

2013

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Effects of simulated eutrophication and overfishing on coral reef invertebrates, algae and microbes in the Red Sea. (2013). nbn-resolving.de. http://nbn-resolving.de/urn:nbn:de:gbv:46-00103432-12

The emergent role of small-bodied herbivores in pre-empting phase shifts on degraded coral reefs

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The emergent role of small-bodied herbivores in pre-empting phase shifts on degraded coral reefs. (n.d.). cir.nii.ac.jp. https://doi.org/10.1038/srep39670

Environmental issues with coral reefs

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Environmental issues with coral reefs. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Environmental_issues_with_coral_reefs

Density-dependence and territorial competitors can modulate parrotfish social foraging and herbivory on coral reefs

2026

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Harshul, T., Anish, P., & Teresa, A. (2026). Density-dependence and territorial competitors can modulate parrotfish social foraging and herbivory on coral reefs. zenodo.org. https://doi.org/10.5281/zenodo.17417675

Environmental Factors Affecting Large-Bodied Coral Reef Fish Assemblages in the Mariana Archipelago

2012

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Richards, B. L., Williams, I. D., Vetter, O. J., & Williams, G. J. (2012). Environmental Factors Affecting Large-Bodied Coral Reef Fish Assemblages in the Mariana Archipelago. doi.org. https://doi.org/10.1371/journal.pone.0031374

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