The impact of distribution change on fisheries in Southeast Asia: a case study in the Batan Estuary, Aklan, Central Philippines

Kamiyama, Ryutaro; Miyata, Tsutomu; Kurokura, Hisashi; Ishikawa, Satoshi

doi:10.1007/s12562-015-0855-x

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…This is particularly true in the case of the Batan municipality where locals prefer to collect seafood in mangrove areas and/or in their fishponds (Municipal agriculturist, personal communication, March 19, 2019). In Batan Bay, stationary fishing gears (e.g., fish corral, tidal traps) are more prominent, which provide a variety of seafood (e.g., shrimps, crabs, milkfish) compared to traditional fishing methods (e.g., hook and line gear, gillnet) and gleaning activities (Kamiyama et al, 2015; Monteclaro et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Understanding rural and urban perceptions of seagrass ecosystem services for their blue carbon conservation strategies in the Philippines

Quevedo

Uchiyama

Kohsaka

2022

Ecological Research

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Section: Discussionmentioning

confidence: 99%

Understanding rural and urban perceptions of seagrass ecosystem services for their blue carbon conservation strategies in the Philippines

Quevedo

Uchiyama

Kohsaka

2022

Ecological Research

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“…According to the 2012 municipal fisheries profile, the total population of the three municipalities enclosing Batan Estuary (i.e., New Washington, Batan, and Altavas) was 101,382 where 80% of that lived on or near the coasts. Furthermore, 5,369 people worked in the fishing industry (as cited in Kamiyama et al, 2015). Thus, fishing is an active industry in Batan Estuary with much of its population relying on it.…”

Section: Study Areamentioning

confidence: 99%

Development of Google Earth Engine Application for Spatiotemporal Analysis of Turbidity in Batan Estuary, Aklan Through the Harmonization of Landsat and Sentinel-2 Imagery

Zablan,

Blanco,

Primavera-Tirol

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Water turbidity poses a threat to marine life and the economy. To address this, regular monitoring is crucial. Field methods are commonly employed, but they can be costly and challenging to perform consistently and historically. Luckily, remote sensing satellites offer a viable solution by collecting image data from space for Earth observation. Researchers have utilized these satellite images to develop indices for analyzing water turbidity and chlorophyll-a content. Leveraging the Google Earth Engine geospatial data computing platform, an application has been created to facilitate water quality monitoring. The app harmonizes Landsat and Sentinel-2 Imagery to improve temporal resolution and increase historical data availability. These images are then subjected to indices, namely the Normalized Difference Turbidity Index (NDTI) and the Normalized Difference Chlorophyll Index (NDCI), to estimate water turbidity and chlorophyll-a content, respectively. To evaluate the effectiveness of the app, the Batan Estuary in Aklan was selected as a test site. Annual mean water turbidity data from 2000 to 2021 were processed and downloaded through the app and subsequently imported into ArcGIS Pro for further analysis. Raster statistics revealed that turbidity and chlorophyll-a content have consistently decreased since 2000, with already low levels observed. Although the river section exhibited the highest turbidity relative to the estuary, it can still be deemed nonpolluted based on US EPA standards. Moreover, ArcGIS's emerging hotspot analysis indicated that the estuary predominantly featured cold spots, indicating minimal areas with clusters of turbid water over time.

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“…The New Washington-Batan Estuary borders the municipalities of New Washington, and Altavas, in Aklan Province, Philippines. The Batan estuary is surrounded by mangroves and it is the major source of many fishery products in the area (Kamiyama 2015). Recently, little or no available data on the activity of EDCs in Batan estuary have been reported.…”

Section: Experimental Animalsmentioning

confidence: 99%

Identification and quantification of vitellogenin gene in eyebrow goby (Oxyurichthys ophthalmonema)

et al. 2022

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Abstract. Sa-An AC, Quinitio GF, Anasco NC, Traifalgar RFM, Nillos MGG. 2022. Identification and quantification of vitellogenin gene in eyebrow goby (Oxyurichthys ophthalmonema). Biodiversitas 23: 5606-5613. Vitellogenin (VTG) gene has been used as a biomarker for exposure to estrogenic compounds in marine and freshwater fish species. There was limited information about the detection of VTG mRNA in an estuarine environment using a bioindicator fish species. In this study, a quantitative real-time polymerase chain reaction (qPCR) assay was developed for quantification of VTG mRNA normalized to ?-actin in eyebrow goby, Oxyurichthys ophthalmonema. VTG mRNA in the liver of reproductively mature female samples was isolated, amplified, and sequenced. There were 430 bp fragments of VTG, corresponding to a 143 amino acid sequence obtained from eyebrow goby. The partial protein sequence exhibited similar identities with the phosvitin motif of VTG in other gobies. The new qPCR assay was developed through the evaluation of hepatic mRNA levels in nonreproductive male eyebrow goby at 0, 6, 12, and 24 h following intraperitoneal injection of 10 mg kg-1 17?-estradiol. Hepatic mRNA levels were detected 6 h after 17?-estradiol injection and the highest VTG expression was noted 24 h after injection. Results of the present study suggest that male eyebrow goby can be used as indicator species for estrogenic contamination. Likewise, the established qPCR assay can be used to assess recent exposure to estrogenic contaminants in the aquatic environment. The characterization of the amplified VTG gene from eyebrow goby and the application of the qPCR assay developed for eyebrow goby in monitoring EDCs in the field may be considered for future investigation.

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The impact of distribution change on fisheries in Southeast Asia: a case study in the Batan Estuary, Aklan, Central Philippines

Cited by 6 publications

References 10 publications

Understanding rural and urban perceptions of seagrass ecosystem services for their blue carbon conservation strategies in the Philippines

Understanding rural and urban perceptions of seagrass ecosystem services for their blue carbon conservation strategies in the Philippines

Development of Google Earth Engine Application for Spatiotemporal Analysis of Turbidity in Batan Estuary, Aklan Through the Harmonization of Landsat and Sentinel-2 Imagery

Identification and quantification of vitellogenin gene in eyebrow goby (Oxyurichthys ophthalmonema)

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