By Herp News
[dropcap]R[/dropcap]eef fish may take longer to recover from overfishing than previously thought. While smaller fish with short life spans tend to rebound quickly in protected reefs, larger, slow growing fish may need more than 100 years of strong protection to fully recover, a new study concludes. The study was published online this month in the journal Proceedings of the Royal Society B. Tim McClanahan, senior conservationist for the Wildlife Conservation Society, and Nick Graham, a researcher with James Cook University in Australia, analyzed fish survey data from 324 coral reef sites in the Indian Ocean, spanning eight countries. They classified the study sites into six management categories ranging from large, uninhabited, remote protected areas down to reefs open to fishing with no restrictions on gear, which included destructive dragnets and explosives. For the fish at each site, the researchers evaluated family-level life history characteristics, such as body length, growth rate, age of maturation, and mortality. Previous research into reef-fish recovery rates primarily investigated biomass — the collective weight of fish in a given area — and tended to conclude that fish communities in protected reefs had recovered when their biomass leveled off, often after about 20 years. But many life-history metrics of a reef community continue to change for decades after biomass levels off, the study found, and the full recovery process may take over a century. Reef fish in the Maldives, where some sites examined in the present study were located. Photo by Malcom Browne.…
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