A geographic information system for fisheries management in American Samoa

Riolo, Francesca

doi:10.1016/j.envsoft.2005.05.005

Cited by 31 publications

(22 citation statements)

References 8 publications

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“…For fishery managers, it is essential that all the information related to a given resource is presented succinctly and precisely in an easily understood format (CADDY; GARCIA, 1986). The spatial dimension is important for both the development and the planning of fishery resource exploitation (MEADEN, CHI, 1996;GRAAF et al, 2003;RIOLO, 2006). Approximately 3.4 million tons of shrimp are caught worldwide every year.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

et al. 2015

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The spatial distribution of the southern brown shrimp Farfantepenaeus subtilis (Pérez-Farfante, 1967) was studied based on industrial fishing fleet activities and is associated with geological and oceanographic characteristics of the benthonic environments on the Amazon continental shelf. Using a geographical information system (GIS) this paper sought to calculate the relative abundance of brown shrimp based on catch per unit effort (CPUE) and compare it with bathymetry, type of sedimentary structure, sedimentation rate and bottom salinity. As a result, we have concluded that the relative abundance (in terms of CPUE) is not uniformly distributed in space. Spatial analysis indicates that commercial trawling efforts were made in the (foreset) region of the subaqueous Amazon delta at depths of 40 to 60 m. In this region, prawn are responsible for the bioturbation of the sediments and the creation of a sedimentary structure called mottled mud. In the foreset region, sedimentation rates progressively increased up to 10 cm.yr-1; re-suspension was reduced and bottom salinity was high (~ 36). It appears that all of these factors define a stable muddy area with intense bioturbation. This notable biological activity is to be explained by the occurrence of a high F. subtilis abundance that appears to originate in a microbial loop. We concluded that by combining fishery information with environmental data from a GIS, it was possible to identify abundance distribution patterns for southern brown shrimp and other economically important fishery resources and to understand how they change on a large spatial-scale.

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Section: Introductionmentioning

confidence: 99%

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

et al. 2015

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“…Numerous studies have either used the location where the longline gear begins to be set (the "set point") to represent fishing effort or aggregate the effort to low resolution grid cells based on the set point location (He et al, 1997;Maury et al, 2001;Seki et al, 2002;Zagaglia et al, 2004). Others have used the central point (centroid) of non-specific set and haul locations (Bigelow et al, 1999), or the centroid of the beginning and end of the set (Riolo, 2006). Combinations of points used to form polylines (e.g., connecting the point at the beginning of the set with the point at the end of the haul) have also been used to designate fishing effort (Klaer and Polacheck, 1998;Brothers et al, 1999a;Santos et al, 2006).…”

Section: The Spatial Representation Of Longline Fishing Effortmentioning

confidence: 99%

A comparison of methods to spatially represent pelagic longline fishing effort in catch and bycatch studies

Dunn¹,

Kot²,

Halpin³

2008

Fisheries Research

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“…En el caso del buceo con BH se utilizó el tiempo efectivo de pesca por viaje como la unidad de esfuerzo que mejor explicó la variación de las capturas de pulpo. Con el fin de conocer si la dinámica de la distribución e intensidad de estas unidades de esfuerzo cambia en la escala espacial en contraste con la temporada de pesca, se siguió el procedimiento sugerido por Riolo (2006) en el cual se generan superficies de densidad mediante la función de densidad de kernel. Para el BL la densidad se expresó como el número de buzos por km² y para el caso de BH el núme-ro de horas de buceo por km².…”

Section: Fuentes De Variación De Las Capturasunclassified

Dinámica espacio-temporal del esfuerzo en una pesquería de buceo artesanal multiespecífica y sus efectos en la variabilidad de las capturas: Implicaciones para el manejo sostenible

Madrigal

Márquez

2014

RBT

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Dinámica espacio-temporal del esfuerzo en una pesquería de buceo artesanal multiespecífica y sus efectos en la variabilidad de las capturas:Implicaciones para el manejo sostenible Abstract: Spatio-temporal dynamics of fishing effort in a multi-species artisanal diving fishery and its effects on catch variability: Insights for sustainable management. Artisanal diving fisheries are a source of income, employment and food security of coastal areas in many countries. Understanding the dynamics of these fisheries, including the spatial and temporal dynamics of fishing effort, gears and species can help to address the challenges involved in fisheries management. We aimed to analyze the differences in fishing strategies undertaken by fishers that use two different diving methods (hookah and free diving), the conditions and their potential impacts on catches when adjustments to those strategies are applied over time. For this, detailed information of fishing operations from artisanal boats in the North Pacific coast of Costa Rica was analyzed in two fishing seasons (2007-2008 and 2011-2012). Data were collected by onboard observers (fishing site, fishing time, species composition, depth and visibility). Additionally, interviews with divers were applied to obtain information of price per species, species volume and fishing operations. From the total number of trips during both seasons, hookah diving was represented by a sample size of 69.3%, while free diving, with a sample of 41.9%. More than 15 species were identified in each fishing season. Nevertheless, three categories had substantial contributions in both seasons with differences in the proportions for each case: green lobster (Panulirus gracilis), octopus (Octopus sp.) and parrotfish (Scarus perrico and S. ghobban). It is worth noting that an important proportion of catch was retained by fishers for personal consumption purposes, including species of high commercial value. Additional night diving activity, increased the number of dives from one season to another. Besides, cooperation processes in free diving fishing operations, and changes in fishing effort between seasons, defined important changes in fishing strategies. Potential causes of changes in fishing strategies and the implications for management to ensure the sustainability of these fisheries in the long term are discussed. Rev. Biol. Trop. 62 (4): 1565-1586. Epub 2014 December 01.

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A geographic information system for fisheries management in American Samoa

Cited by 31 publications

References 8 publications

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

A comparison of methods to spatially represent pelagic longline fishing effort in catch and bycatch studies

Dinámica espacio-temporal del esfuerzo en una pesquería de buceo artesanal multiespecífica y sus efectos en la variabilidad de las capturas: Implicaciones para el manejo sostenible

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