Growth, mortality and exploitation rate of Plectropomus maculatus and P. oligocanthus (Groupers, Serranidae) on Cenderawasih Bay National Park, Indonesia

Mudjirahayu,; Bawole, Roni; Rembet, Unstain N. W. J.; Ananta, Arnold S.; Runtuboi, Ferawati; Sala, Ridwan

doi:10.1016/j.ejar.2017.09.002

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…In both North and South Raja Ampat MPAs, fish biomass increased within sustainable use zones, suggesting that these MPAs are balancing sustainable fishing with biodiversity conservation. Fish biomass trends are not representative of all BHS MPAs, as MPAs with established monitoring programs have greater management capacity, although our results broadly reflect other recent BHS reef fish studies (e.g., Mudjirahayu, Rembet, Ananta, Runtuboi, & Sala, 2017;Brown et al, 2018;Sadovy de Mitcheson, Suharti, & Colin, 2019;Text S3). Global studies have indicated that healthy coral reefs without fishing typically sustain 1,000 kg/ha of fish biomass (Karr et al, 2015;MacNeil et al, 2015;McClanahan et al, 2019), so it is encouraging that North Raja Ampat sustainable fishing areas maintain fish biomass above this level.…”

Section: Critical Habitat Protection and Ecosystem Healthcontrasting

confidence: 49%

The Bird's Head Seascape Marine Protected Area network—Preventing biodiversity and ecosystem service loss amidst rapid change in Papua, Indonesia

Purwanto

Andradi-Brown

Matualage

et al. 2021

Conservat Sci and Prac

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The Bird's Head Seascape (BHS), Papua, Indonesia is located within the epicenter of global marine biodiversity and has been the focus of recent conservation efforts to protect marine resources. Here, we provide an overview of Marine Protected Areas (MPAs) progress in the BHS over the past decade, including establishment history, changes in management effectiveness and ecosystem health, as well as examining trends in tourism growth. While generally viewed as a conservation success story, we reflect on both successes and challenges in the BHS, identifying where we need to continue to improve and adapt in response to rapid economic and environmental change. As of 2020, BHS MPAs cover 5.1 million ha across 23 MPAs. As expected, management effectiveness is steadily increasing in BHS MPAs-although newer MPAs face Purwanto and Dominic A. Andradi-Brown should be considered joint first authors.

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Section: Critical Habitat Protection and Ecosystem Healthcontrasting

confidence: 49%

The Bird's Head Seascape Marine Protected Area network—Preventing biodiversity and ecosystem service loss amidst rapid change in Papua, Indonesia

Purwanto

Andradi-Brown

Matualage

et al. 2021

Conservat Sci and Prac

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“…Key population dynamics parameters include growth, mortality, exploitation rate, and recruitment (Kirubasankar et al 2013;Mehanna et al 2013;Sabrah et al 2015;Ramachandran and Ramalingam 2020). Data on grouper population dynamics in Indonesia are still limited, although studies have been carried out in Taka Bonerate National Park Waters (Fatma et al 2021), Spermonde Archipelago in South Sulawesi (Ernaningsih et al 2014;Ernaningsih et al 2019), Cendrawasih Bay National Park Waters in Papua (Bawole et al 2017;Mudjirahayu et al 2017;Bawole et al 2018), Saleh Bay in West Nusa Tenggara and East Nusa Tenggara (Halim et al 2020;Efendi et al 2022), Wangi-wangi Island in Southeast Sulawesi (Patanda et al 2017), and in Bangka Regency (Adibrata et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Population dynamics of reef fish in the Kwandang Bay, Sulawesi Sea, Indonesia

et al. 2022

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Abstract. Achmad DS, Gani S, Ardiansyah W, Mokoginta MM, Nurdin MS, Jompa J, Indrianti MA, Achmad N. 2022. Population dynamics of reef fish in the Kwandang Bay, Sulawesi Sea, Indonesia. Biodiversitas 23: 5217-5226. The grouper stocks in Kwandang Bay, Sulawesi Sea, Indonesia, are dominated by orange-spotted grouper (Epinephelus coioides) and coral trout (Plectropomus leopardus). However, the Kwandang Bay grouper fishery is currently experiencing serious challenges due to population decline resulting in a decline in both the average size of fish caught and the production volume. This study was conducted in Kwandang Bay, Sulawesi Sea, from January to December 2021. The population dynamics parameters estimated were growth, recruitment, mortality, exploitation rate and yield per recruit. The results showed that the total length (TL) of E. coioides and P. leopardus ranged from 16.50-101 cm and 17.90-60 cm, respectively, with Von Bertalanffy K-coefficients of 0.38 and 0.69, respectively. Recruitment occurred during most of the year, with respective recruitment value ranges of 0.99-17.11% and 0.08-19.22%. Natural and fishing mortality was 0.69/year-1 and 0.87/year-1 for E. coioides, 1.16/year-1 and 1.47/year-1 for P. leopardus. Beverton and Holt yield per recruit analysis indicated recruitment overfishing of both E. coioides and P. leopardus. Fishing regulations are needed to maintain a sustainable grouper fishery, including a 25% reduction in fishing vessels and gear, to enable the groupers of Kwandang Bay to spawn at least once during their life cycle.

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“…The excessive catch of individuals that have not yet reached maturity and spawned tends to lead to the depletion of fish stocks [46]; conversely, the higher the proportion of mature individuals caught, the higher the likelihood that the fish stock can be maintained and support a sustainable fishery [4]. One fisheries management tool to reduce juvenile catch and conserve fish stocks is to adopt a minimum legal size (MLS) approach, in particular with respect to grouper fisheries [19,47].…”

Section: Discussionmentioning

confidence: 99%

“…One measure that can be applied to address the tendency of fishermen to catch small groupers, thereby preventing them from reaching maturity and reproducing, is to regulate the minimum legal size (MLS) that fishermen are allowed to catch [9,[16][17][18]. Minimum legal size policies for groupers are especially important when there are signs of recruitment overfishing and/or growth overfishing [18][19][20][21], such as those observed in Kwandang Bay.…”

Section: Introductionmentioning

confidence: 99%

Minimum legal size of commercially important groupers in the Coral Triangle Sulawesi Sea, Indonesia

Achmad,

Nurdin,

Jompa

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Major challenges facing grouper fisheries in Kwandang Bay within the Coral Triangle include declines in potential spawners and as well as in the abundance of juvenile fish. One measure that can be taken to maintain valuable fisheries stocks such as groupers is to regulate the minimum legal size (MLS). The aim of this research was to identify and analyse the mean size at first maturity (Lm50) as a basis for setting an MLS for three grouper species of commercial importance. A total of 525 grouper specimens (307 Variola albimarginata, 90 Variola louti, and 128 Plectropomus leopardus) were collected from January to October 2022 from grouper traders, traditional markets, and the Kwandang Fishing Port. The Lm50 for each species was calculated using the Spearman-Karber formula. The Kwandang Bay catch was dominated by immature juvenile fish and the size class contributing the most individuals was below the Lm50 for all three grouper species. The MLS should be at least 32 cm for V. albimarginata, 33 cm for V. louti and 35 cm for P. leopardus in order to enable sufficient fish to spawn at least once, increase the number of spawners, and thereby maintain stock abundance.

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Growth, mortality and exploitation rate of Plectropomus maculatus and P. oligocanthus (Groupers, Serranidae) on Cenderawasih Bay National Park, Indonesia

Cited by 10 publications

References 13 publications

The Bird's Head Seascape Marine Protected Area network—Preventing biodiversity and ecosystem service loss amidst rapid change in Papua, Indonesia

The Bird's Head Seascape Marine Protected Area network—Preventing biodiversity and ecosystem service loss amidst rapid change in Papua, Indonesia

Population dynamics of reef fish in the Kwandang Bay, Sulawesi Sea, Indonesia

Minimum legal size of commercially important groupers in the Coral Triangle Sulawesi Sea, Indonesia

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