Effects of social factors on fishing effort: The case of the Philippine tuna purse seine fishery

Libre, S.V.D.; Voorn, G.A.K. van; Broeke, Guus ten; Bailey, Megan; Berentsen, P.B.M.; Bush, Simon R.

doi:10.1016/j.fishres.2015.07.033

Cited by 28 publications

(37 citation statements)

References 33 publications

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“…The opportunistic feeding behavior of tunas and its predisposition to social interaction (Robert et al, 2013) may have implications on its movement from one anchored FAD to another (Ménard et al, 2006). The attraction distance of 10 km which fishers mentioned about tunas is reasonable given that the usual maximum inter-FAD distances between anchored FADs in the Philippines, is of the same distance (Libre et al, 2015;Macusi et al, 2015). In addition, tunas are attracted to floating objects and they associate with FADs for some time.…”

Section: Discussionmentioning

confidence: 99%

“…The increase in FAD use has led to an increase in fisheries production (Macusi et al, 2015). In the 1980s, fishing operations were preferred to be close to the shore which ensured lower fuel costs and fresh catch (Libre et al, 2015). However, this changed in the 1990s as the distance between FAD deployment areas and the homeport increased from 100 to 500 km offshore (Macusi et al, 2015).…”

Section: The Philippine Tuna Fisheriesmentioning

confidence: 99%

“…FADs that are anchored at depths of 2500-5000 m in Mati (Philippine Sea), Celebes and Sulu seas, however, would cost Php 120,000.00 (U$2500) per unit. FAD deployments are adjusted according to the availability of space in the fishing grounds and productivity of the area in terms of catch (Libre et al, 2015;Macusi et al, 2015).…”

Section: The Philippine Tuna Fisheriesmentioning

confidence: 99%

“…The deployment of a FAD is based on well-calculated decision by these fishers and not by random choice. Such decision is influenced by their anticipated risks, projected abundance of catch and foreseen operational factors or constraints (Libre et al, 2015;Macusi et al, 2015). The daily experience of fishers become a very strong information that can be very useful to field researchers as it can provide detailed knowledge on the studies of fish behavior (Johannes et al, 2000;van Densen, 2001).…”

Section: Local Ecological Knowledgementioning

confidence: 99%

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Local Ecological Knowledge (LEK) on Fish Behavior Around Anchored FADs: the Case of Tuna Purse Seine and Ringnet Fishers from Southern Philippines

2017

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The Fishing Industry in the Philippines plays an important role in the food and employment need of Filipino fishers. By using anchored Fish Aggregating Devices (FADs or payao), the Philippine tuna fisheries was transformed into a million-dollar industry. Minimal studies on exploitation rates and fish behavior around anchored FADs hampered further understanding of this fishery practice. Studies on fish behavior using Local Ecological Knowledge (LEK) are good complement where data is limited. A study using semi-structured interview (n = 46) and three focus group discussions (n = 39 participants) to record fishers' knowledge and observations on the behavior of different fish species around anchored FADs was conducted. This particularly focused on attraction, retention, and departure behavior of fishes in identified FAD sites. Based on the fishers' knowledge, tuna schools are attracted to anchored FADs at 10 km distance. In anchored FADs, tuna form schools segregated by species and size. There was no relationship between the attraction distance and the reported school size and the various waiting times for fish to aggregate below the FADs. There was no variation between the species present at day or night time although fishers have reported a distinction of species found near the surface (0-10 m) and those found at other depths (11-20 m). Juvenile yellowfin tuna (Thunnus albacares), skipjack (Katsuwonus pelamis), and frigate and bullet tunas (Auxis spp.) are found to stay at 25-50 m from the FAD at a depth of >20 m. Adult oceanic tunas reside in deeper waters (75 m). The fish visual census produced similar results with the semi-structured interviews and FGDs but did not observe oceanic tunas at depths of 15-20 m in the anchored FADs examined.

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Section: Discussionmentioning

confidence: 99%

Section: The Philippine Tuna Fisheriesmentioning

confidence: 99%

Section: The Philippine Tuna Fisheriesmentioning

confidence: 99%

Section: Local Ecological Knowledgementioning

confidence: 99%

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Local Ecological Knowledge (LEK) on Fish Behavior Around Anchored FADs: the Case of Tuna Purse Seine and Ringnet Fishers from Southern Philippines

2017

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“…More commonly observed in this search, interviews are conducted with a smaller number of respondents, and responses coded to help inform model structure and parameterization. As one example, Manson et al (2016) use interviews with medium-scale dairy farmers (n ¼ 53) and other key informants in the agricultural landscape (n ¼ 35) to examine social network effects on adoption of rotational grazing; as another, Libre et al (2015) consult a range of fishers, government and other stakeholders (n ¼ 44) from across the Philippines tuna purse seine fishery to inform social factors, norms, and boundedly rational decision-making in their ABM of the fishery.…”

Section: Expert Knowledge Interviews and Observationmentioning

confidence: 99%

Informing decisions in agent-based models — A mobile update

Bell

2017

Environmental Modelling & Software

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Mapping validity and validation in modelling for interdisciplinary research

Broeke

Tobi

2020

Qual Quant

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Complex Adaptive Systems (CAS) is an interdisciplinary and dynamic modelling approach for the study of today’s global challenges. It is used for the explanation, description, and prediction of behaviours of system components and the system at large. To understand and assess the quality of research in which CAS models are designed and used, a thorough understanding of the meanings of ‘validity’ from social science research methodology and ‘validation’ from simulation modelling is needed. In this paper, we first describe the modelling process. Then, we analyse the concepts ‘validity’ and ‘validation’ as used in a set of research methodology textbooks and a set of modelling textbooks. We present one single map that integrates validity as characteristic of the model input, the modelling process, model validation, and the validity of the model built. The map is illustrated by means of one example. The terminology proposed in the map allows to describe and distinguish between the validity of primary research used for input in the model, how the quality of the modelling depends on structural and behavioural validation, and, how the assessment of the validity of the model is informed by these types of validation plus research with independent data.

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Effects of social factors on fishing effort: The case of the Philippine tuna purse seine fishery

Cited by 28 publications

References 33 publications

Local Ecological Knowledge (LEK) on Fish Behavior Around Anchored FADs: the Case of Tuna Purse Seine and Ringnet Fishers from Southern Philippines

Local Ecological Knowledge (LEK) on Fish Behavior Around Anchored FADs: the Case of Tuna Purse Seine and Ringnet Fishers from Southern Philippines

Informing decisions in agent-based models — A mobile update

Mapping validity and validation in modelling for interdisciplinary research

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