Are maximum yields sustainable? Effect of intra-annual time-scales on MSY, stability and resilience

Ricouard, Antoine; Lehuta, Sigrid; Mahévas, Stéphanie

doi:10.1016/j.ecolmodel.2023.110321

Cited by 2 publications

(1 citation statement)

References 57 publications

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“…Produksi rata-rata dan produksi aktual tahun terakhir yang hampir sama dengan JTB menunjukkan pemanfaatan ikan tongkol perairan Maluku Tengah harus segera dikendalikan. Ricouard et al (2023) Rentang eMSY memungkinkan pengelolaan berbasis MSY jauh lebih baik untuk pengelolaan beberapa stok ikan (Earle 2021). Jika kebijakan pemerintah untuk pengelolaan ikan tongkol di Maluku Tengah melalui pembatasan jumlah upaya, maka pembatasannya sampai 3.056 trip/tahun sesuai armada pukat cincin yang beroperasi saat ini.…”

Section: Pembahasanunclassified

POTENSI LESTARI DAN STATUS PEMANFAATAN IKAN TONGKOL (Auxis thazard) DI PERAIRAN MALUKU TENGAH

Waileruny,

Saidi,

Matrutty

2024

Jurnal Marfis

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Fishery resources are open access and often considered as common property. This can lead to a decrease in the quality of fish resources and economic rents. This study aims to calculate the maximum sustainable yield (MSY) and to determine the exploitation status of mackerel tuna (Auxis thazard) in Central Maluku Regency water. Analysis of MSY was conducted using the Walter Hilborn and Schaefer models. It is revealed that the main fishing gear for mackerel tuna fishing in Central Maluku is purse seine which in the MSY analysis are classified as standard fishing gear. The results show that the maximum hMSY and eMSY are 17,329 tons/year and 3,055 trips/year respectively. The utilization status is at the fully-exploited level. Keywords: Fully-exploited of mackerel tuna, mackerel tuna, maximum sustainable yield, production of mackerel tuna, model Schaefer.

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Section: Pembahasanunclassified

POTENSI LESTARI DAN STATUS PEMANFAATAN IKAN TONGKOL (Auxis thazard) DI PERAIRAN MALUKU TENGAH

Waileruny,

Saidi,

Matrutty

2024

Jurnal Marfis

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Evidence for seasonal compensation of hunting mortalities in a long‐lived migratory bird

LeTourneux,

Gauthier,

Pradel

et al. 2024

Journal of Applied Ecology

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Understanding whether hunting mortality is additive to or compensated by other mortality sources is at the heart of managing harvested populations. Long‐lived species are expected to exhibit hunting mortality additive to other sources of mortality, making them ideal candidates for population management through sport harvest. Previous studies on these processes have focussed on density‐dependent natural mortality compensating for hunting mortality, but when harvest occurs in distinct periods of the year, heterogeneity in hunting vulnerability between individuals could also lead to compensatory mortality between these periods. We explore this new idea using the case of the greater snow goose (Anser caerulescens atlantica), a harvested species whose population became overabundant in the late 20th century. To control this population, wildlife agencies liberalised hunting regulations with unprecedented actions such as special hunting seasons implemented in spring 1999 in Canada and in winter 2009 in the USA. To determine the relative impact of each measure on survival, we estimated survival of adult geese on a seasonal basis using 30 years of capture‐mark‐reencounter data in a joint live‐and‐dead‐encounter multievent model. We also used this quasi‐experimental set‐up to evaluate possible compensation in hunting mortality between seasons. We found that both special hunting seasons decreased goose survival in the seasons and periods in which they were implemented. However, survival increased during the spring hunting season after the establishment of the special winter hunting season in the USA in 2009. There was a negative relationship between annual spring and winter mortalities, suggesting that the increase in hunting mortality in winter was compensated by a reduction in spring mortality after 2009. Synthesis and applications: To our knowledge, we report the first documented instance of hunting mortality in one season being compensated by a reduction in hunting mortality in a subsequent season. We suggest that heterogeneity in hunting vulnerability among individuals, possibly linked to the presence of juveniles, may explain this phenomenon. A better knowledge of seasonal patterns and relationships between mortality components is needed to improve our understanding of population dynamics and management of harvested populations.

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Are maximum yields sustainable? Effect of intra-annual time-scales on MSY, stability and resilience

Cited by 2 publications

References 57 publications

POTENSI LESTARI DAN STATUS PEMANFAATAN IKAN TONGKOL (Auxis thazard) DI PERAIRAN MALUKU TENGAH

POTENSI LESTARI DAN STATUS PEMANFAATAN IKAN TONGKOL (Auxis thazard) DI PERAIRAN MALUKU TENGAH

Evidence for seasonal compensation of hunting mortalities in a long‐lived migratory bird

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