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Advances in the aquatic sciences
RESEARCH ARTICLE

Baseline assessment of microplastics and biochemical response of Anadara antiquata as a sentinel species for biomonitoring in Fiji

Rufino Varea https://orcid.org/0000-0002-3002-6944 A * , Jasha Dehm https://orcid.org/0000-0002-9325-2826 A B and Francis Mani A
+ Author Affiliations
- Author Affiliations

A School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, Suva, Fiji.

B Pacific Centre for Environment and Sustainable Development, The University of the South Pacific, Suva, Fiji.

* Correspondence to: s11088132@student.usp.ac.fj

Handling Editor: Donald Baird

Marine and Freshwater Research 75, MF24083 https://doi.org/10.1071/MF24083
Submitted: 19 April 2024  Accepted: 23 October 2024  Published: 13 November 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Microplastics are a concern for maritime nations such as Fiji, which rely heavily on seafood, such as bivalves, which can transfer pollutants through the food chain. The lack of biomonitoring studies in the Pacific region highlights the necessity of researching microplastic pollution in seafood.

Aims

This study quantifies microplastics in Anadara antiquata, a commonly consumed shellfish in Fiji, and evaluates its general biochemical responses. As a baseline, this study is not to draw an association between the two endpoints (microplastics and biochemical responses), rather present these as baselines for future studies.

Methods

A total of 58 specimens from Ba River Delta, Rakiraki Bay and Vueti Navakavu were examined, where differences in potential sources or pathways for microplastics, including anthropogenic pollutants with the potential to induce stress on marine animals, were considered (rivers, industrial zones, stormwater outlets, sewerage outfalls and mining area). Specific hepatopancreatic enzyme activities associated with detoxification (glutathione-S transferase, GST) and oxidative stress (glutathione peroxidase, GPX, and glutathione reductase, GR) were measured.

Key results

Microplastics were extracted, classified by morphology and quantified. The study found that 64% of specimens had microplastics, <1.0 mm being more prevalent. Ba River Delta showed significant biochemical stress (Kruskal–Wallis test; P < 0.05) with GST (χ2 = 40.28, d.f. = 2, P-value < 0.001), GPX (χ2 = 38.38, d.f. = 2, P-value < 0.001) and GR χ2 = 45.14, d.f. = 2, P-value < 0.001) being considered as likely to be responding to pollution.

Conclusion

As a baseline, the study underlines the need for biomonitoring as a result of varying and concerning levels of pollution and biochemical stress responses found across the study areas. Integrating biomonitoring methods into risk-assessment protocols in Fiji may support establishment of opportunities or considerations for health guidelines and policy interventions to minimise human exposure to microplastics, and regulate environmental pollution.

Implications

These measures are crucial for protecting public health and monitoring pollution impacts.

Keywords: biomarkers, biomonitoring, Fiji, human health, microplastics, Pacific Islands, policy, pollution, risk assessment, seafood.

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