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Larval Export from Marine Reserves and the Recruitment Benefit for Fish and Fisheries

Key Message

Adequately protected reserve networks can make a significant contribution to the replenishment of marine populations on both reserve and fished reefs at a scale that benefits local stakeholders.

Source

Harrison, Hugo B. et al. (2012). Larval Export from Marine Reserves and the Recruitment Benefit for Fish and Fisheries. Current Biology. 22, 11:1023-1028.

Purpose

Marine reserves, areas closed to all forms of fishing, continue to be advocated and implemented to supplement fisheries and conserve populations  However, although the reproductive potential of important fishery species can dramatically increase inside reserves, the extent to which larval offspring are exported and the relative contribution of reserves to recruitment in fished and protected populations are unknown Using genetic parentage analyses, we resolve patterns of larval dispersal for two species of exploited coral reef fish within a network of marine reserves on the Great Barrier Reef.

Evidence

In a 1,000 km2 study area, populations resident in three reserves exported 83% (coral trout, Plectropomus maculatus) and 55% (stripey snapper, Lutjanus carponotatus) of assigned offspring to fished reefs, with the remainder having recruited to natal reserves or other reserves in the region. We estimate that reserves, which account for just 28% of the local reef area, produced approximately half of all juvenile recruitment to both reserve and fished reefs within 30 km. 

Benefit Statements / Outcomes

Leadership Provided By:

  • Leisure Information Network (LIN)
  • Alberta Recreation and Parks Association

On Behalf Of:

  • Canadian Parks and Recreation Association (CPRAA)

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