Christopher Costello, Steven D. Gaines, and John Lynham find that fisheries with individual fisherman's quotas are less susceptible to overfishing: Privatization prevents collapse of fish stocks, global analysis shows. The actual title of the article in Science is "Can Catch Shares
Prevent Fisheries Collapse?" I haven't found a link to the original
article or an earlier working paper yet.
The "privatization" here is the assignment to a right to a share in the seasonal or annual harvest. A fisherman with an individual and transferable quota has an asset whose value depends on the long-term health of the fish stock, and a greater incentive to care about that stock.
The abstract:
Recent reports suggest that most of the world’s commercial fisheries could collapse within decades.
Although poor fisheries governance is often implicated, evaluation of solutions
remains rare. Bioeconomic theory and case studies suggest that rights-based catch shares can
provide individual incentives for sustainable harvest that is less prone to collapse. To test
whether catch-share fishery reforms achieve these hypothetical benefits, we have compiled a
global database of fisheries institutions and catch statistics in 11,135 fisheries from 1950 to
2003. Implementation of catch shares halts, and even reverses, the global trend toward
widespread collapse. Institutional change has the potential for greatly altering the future of
global fisheries.
And in conclusion:
Although bioeconomic theory suggests that
assigning secure rights to fishermen may align
incentives and lead to significantly enhanced biological
and economic performance, evidence to
date has been only case- or region-specific. By
examining 11,135 global fisheries, we found a
strong link: By 2003, the fraction of ITQ-managed
fisheries that were collapsed was about half that of
non-ITQ fisheries. This result probably underestimates
ITQ benefits, because most ITQ fisheries
are young.
The results of this analysis suggest that well designed
catch shares may prevent fishery
collapse across diverse taxa and ecosystems.
Although the global rate of catch-share adoption
has increased since 1970, the fraction of fisheries
managed with catch shares is still small. We can
estimate their potential impact ifwe project rightsbased
management onto all of the world’s fisheries
since 1970 (Fig. 2). The percent collapsed is
reduced to just 9% by 2003; this fraction remains
steady thereafter. This figure is a marked
reversal of the previous projections.
Despite the dramatic impact catch shares
have had on fishery collapse, these results
should not be taken as a carte blanche endorsement.
First, we have restricted attention
to one class of catch shares (ITQs). Second,
only by appropriately matching institutional reform
with ecological, economic, and social characteristics
can maximal benefits be achieved.
Nevertheless, these findings suggest that as
catch shares are increasingly implemented
globally, fish stocks, and the profits from harvesting
them, have the potential to recover
substantially.
The Environmental Defense Fund reports here: Catch Shares Key to Reviving Fisheries. New Study Shows Innovative Approach Can Help Solve Overfishing. Here's Costello's website with background information on the study: Can Catch Shares Prevent Fisheries Collapse?
Revised Sept 19 to add a comment about how individual quotas give fishermen a greater interest in the long-term health of the fish stock.