DNA Barcoding of Rays from the South China Sea

John, B. Akbar; Asrul, M. A. Muhamad; Arshaad, Wahidah Mohd; Jalal, K. C. A.; Sheikh, Hassan I.

doi:10.1007/978-3-319-90680-5_14

Cited by 1 publication

(1 citation statement)

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“…data). Red diamond ( G. poecilura ) and blue diamond ( G. zonura ) indicate occurrence records from previous published studies and reports (Ahmad et al ., 2015; Ahmad et al ., 2017; Akbar John et al ., 2018; Arshad et al ., 2020; Last et al . 2010; Wanchana et al ., 2020; Yano et al ., 2005)…”

Section: Resultsmentioning

confidence: 99%

Reproductive biology, length‐weight relationship and diet of co‐occurring butterfly rays, Gymnura poecilura and Gymnura zonura, in Malaysian waters

Leung

Then

Loh

2022

Journal of Fish Biology

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Recent IUCN assessments had resulted in up listing of the status of butterfly rays due to concerns of overfishing, but inadequate biological understanding of these rays prevents meaningful conservation and management measures. Therefore, this study was undertaken to address knowledge gaps in the reproductive biology and diet of longtail butterfly ray (Gymnura poecilura) and zone tail butterfly ray (Gymnura zonura) in Malaysian waters. From surveys of landing sites and fish markets from years 2017 to 2022, size (disc width, DW), weight and maturity were recorded, and stomachs were collected from 94 G. poecilura (N = 39 females and 55 males) and 20 G. zonura (N = 10 females and 10 males) specimens. The length-weight relationships were significantly different between sexes for G. poecilura. The size at maturity (DW50) was estimated to be 476.0 mm (females), 385.0 mm (males) for G. poecilura and 442.0 mm (combined) for G. zonura. The number of embryos ranged from 1 to 6, and the embryo size was between 73.90 to 130.44 mm DW. Dietary analysis of stomach contents revealed that fish prey was dominant in both G. poecilura [94.4% Index of Relative Importance (IRI)] and G. zonura (100% IRI). Ontogenetic shift was seen in G. poecilura that fed on more variety of prey items, including shrimps, squids and crabs with an increase in body size. Both species co-occur all along coastal Malaysia although G. zonura is rarely encountered from fisheries surveys along the Strait of Malacca. Given similar habitat associations and dietary habits, G. poecilura may be able to outcompete G. zonura across their shared habitat range. The validity of G. japonica and G. micrura records in Malaysia remains questionable and requires future investigation.

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Section: Resultsmentioning

confidence: 99%