The reproductive cycle of Octopus cyanea in southwest Madagascar and implications for fisheries management

Raberinary, Daniel; Benbow, Sophie

doi:10.1016/j.fishres.2012.02.025

Cited by 35 publications

(50 citation statements)

References 19 publications

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“…comm, [52]). These four octopus species each have a lifecycle of about one year, dispersing as paralarvae for 2–3 months, then growing over 6–9 months from <1 g at settlement to commonly above 3 kg [53–55].…”

Section: Methodsmentioning

confidence: 99%

Positive Catch & Economic Benefits of Periodic Octopus Fishery Closures: Do Effective, Narrowly Targeted Actions ‘Catalyze’ Broader Management?

et al. 2015

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OverviewEight years of octopus fishery records from southwest Madagascar reveal significant positive impacts from 36 periodic closures on: (a) fishery catches and (b) village fishery income, such that (c) economic benefits from increased landings outweigh costs of foregone catch. Closures covered ~20% of a village’s fished area and lasted 2-7 months.Fishery Catches from Each Closed SiteOctopus landings and catch per unit effort (CPUE) significantly increased in the 30 days following a closure’s reopening, relative to the 30 days before a closure (landings: +718%, p<0.0001; CPUE: +87%, p<0.0001; n = 36). Open-access control sites showed no before/after change when they occurred independently of other management (“no ban”, n = 17/36). On the other hand, open-access control sites showed modest catch increases when they extended a 6-week seasonal fishery shutdown (“ban”, n = 19/36). The seasonal fishery shutdown affects the entire region, so confound all potential control sites.Fishery Income in Implementing VillagesIn villages implementing a closure, octopus fishery income doubled in the 30 days after a closure, relative to 30 days before (+132%, p<0.001, n = 28). Control villages not implementing a closure showed no increase in income after “no ban” closures and modest increases after “ban” closures. Villages did not show a significant decline in income during closure events.Net Economic Benefits from Each Closed SiteLandings in closure sites generated more revenue than simulated landings assuming continued open-access fishing at that site (27/36 show positive net earnings; mean +$305/closure; mean +57.7% monthly). Benefits accrued faster than local fishers’ time preferences during 17-27 of the 36 closures. High reported rates of illegal fishing during closures correlated with poor economic performance.Broader Co-ManagementWe discuss the implications of our findings for broader co-management arrangements, particularly for catalyzing more comprehensive management.

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Section: Methodsmentioning

confidence: 99%

Positive Catch & Economic Benefits of Periodic Octopus Fishery Closures: Do Effective, Narrowly Targeted Actions ‘Catalyze’ Broader Management?

et al. 2015

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“…The fi shery management authority is also exploring the possibility of establishing exclusive area-based concessions for the exploitation of octopus; in other words a form of Territorial Use Rights in Fisheries (TURF), a system already successfully implemented to achieve sustainable management of benthic resources, including for the management of octopus in Chile and Madagascar (see. Martín et al 2010 ;Gelcich et al 2012 ;Raberinary and Benbow 2012 ). Although all the initiatives described above are still at early stages of development and hence not ready for performance evaluation, representatives from fi sher associations tended to see these measures as a step in the right direction and as having the potential to increase the profi tability and economic viability of smallscale fi sheries.…”

Section: The Governing Systemmentioning

confidence: 99%

Interactive Governance for Small-Scale Fisheries

Jentoft¹,

Chuenpagdee²

2015

MARE Publication Series

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“…Octopus cyanea (95% of local catches), Callistoctopus macropus (~4%), Amphioctopus aegina (~1%), Callistoctopus ornatus (rare) (D. Raberinary pers. comm, [52]). These four octopus species each have a lifecycle of about one year, dispersing as paralarvae for 2-3 months, then growing over 6-9 months from <1 g at settlement to commonly above 3 kg [53 -55].…”

Section: Preprintsmentioning

confidence: 96%

“…These four octopus species each have a lifecycle of about one year, dispersing as paralarvae for 2-3 months, then growing over 6-9 months from <1 g at settlement to commonly above 3 kg [53 -55]. They appear to be year-round spawners, although recent studies suggest that recruitment fluctuates throughout the year [52].…”

Section: Preprintsmentioning

confidence: 99%

Positive catch and economic benefits of periodic octopus fishery closures: do effective, narrowly targeted actions ‘catalyze’ broader management?

Oliver

Oleson

Ratsimbazafy

et al. 2015

Preprint

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Eight years of octopus fishery records from southwest Madagascar reveal significant positive impacts from 36 periodic closures on: (a) fishery catches and (b) village fishery income, such that (c) economic benefits from increased landings outweigh costs of foregone catch. Closures covered ~20% of a village’s fished area and lasted 2-7 months. Fishery catches from each closed site: Octopus landings and catch per unit effort (CPUE) significantly increased in the 30 days following a closure’s reopening, relative to the 30 days before a closure (landings: +718%, p<0.0001; CPUE: +87%, p<0.0001; n=36). Open-access control sites showed no before/after change when they occurred independently of other management (“no ban”, n=17/36). On the other hand, open-access control sites showed modest catch increases when they extended a 6-week seasonal fishery shutdown (“ban”, n=19/36). The seasonal fishery shutdown affects the entire region, so confound all potential control sites. Fishery income in implementing villages: In villages implementing a closure, octopus fishery income doubled in the 30 days after a closure, relative to 30 days before (+132%, p<0.001, n=28). Control villages not implementing a closure showed no increase in income after “no ban” closures and modest increases after “ban” closures. Villages did not show a significant decline in income during closure events. Net economic benefits from each closed site: Landings in closure sites generated more revenue than simulated landings assuming continued open-access fishing at that site (27/36 show positive net earnings; mean +$305/closure; mean +57.7% monthly). Benefits accrued faster than local fishers’ time preferences during 17-27 of the 36 closures. High reported rates of illegal fishing during closures correlated with poor economic performance. We discuss the implications of our findings for broader co-management arrangements, particularly for catalyzing more comprehensive management.

show abstract

The reproductive cycle of Octopus cyanea in southwest Madagascar and implications for fisheries management

Cited by 35 publications

References 19 publications

Positive Catch & Economic Benefits of Periodic Octopus Fishery Closures: Do Effective, Narrowly Targeted Actions ‘Catalyze’ Broader Management?

Positive Catch & Economic Benefits of Periodic Octopus Fishery Closures: Do Effective, Narrowly Targeted Actions ‘Catalyze’ Broader Management?

Interactive Governance for Small-Scale Fisheries

Positive catch and economic benefits of periodic octopus fishery closures: do effective, narrowly targeted actions ‘catalyze’ broader management?

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