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Highlight Research This is the first stable isotopes study of rays from Malaysian waters Urea extraction significantly enriched the δ15N values (‰) Urea removal is obliged for stable isotope studies on rays Such methodological information is critical for marine research in the region   Abstract This is the first reported record of stable isotope values for elasmobranch rays within Malaysian waters, and serves as an important baseline methodological information for future studies investigating stable isotope values in both shark and ray species in the region. This study examined the effects of urea removal on the stable isotopes values of δ13C and δ15N in muscle tissues sampled from several elasmobranch rays species, namely Pastinachus atrus, Rhinoptera javanica, Himantura gerrardi, Himantura uarnak and Aetobatus ocellatus. Individual ray species were collected in July and August of 2018, from the coastal waters of Terengganu State, Malaysia. Urea removal was performed by soaking muscle tissue samples in deionised water for at least 24 hours before being dehydrated. The resulting stable isotope values of these samples were compared to samples that did not undergo the urea removal process. Stable isotope values were individual and species-specific, however, the effect of urea removal was significant for δ15N values but did not significantly affect the δ13C values. We conclude that removing urea from elasmobranch samples before stable isotope analysis is advisable to draw correct conclusions about the animal’s diets.

Many wetlands have experienced rapid degradation that is due to unstainable development practices globally. Oftentimes, uncoordinated economic development plans in wetlands and surrounding areas have affected the ecological functions of these sensitive ecosystems. This study examined Setiu Wetland, a wetland with diverse ecosystems on the east coast of Peninsular Malaysia. The main objective of this study was to analyse the potential of marine spatial planning (MSP) to be adopted there. MSP is an integrated coastal zone management tool to govern conflicting uses of an area considering environmental sustainably. Like other coastal zone managements adopted in Southeast Asia, MSP requires participation and awareness of the local community to ensure sustainable development targets are achieved. This paper addresses the local community’s awareness of the ecosystem importance of Setiu Wetland and the socio-economic activities in the area. The study employed a quantitative approach using a survey method to examine, in particular, the local community’s awareness of the oyster habitat that has a direct impact on the Setiu Wetland ecosystems. The research findings indicate that awareness of the importance of oyster habitats to the wetland ecosystems is high among the local community. The community strongly supports the idea of protecting and preserving the wetland to ensure the healthy functioning of ecosystems.