Klangnurak, Wanlada

Preferred name

Klangnurak, Wanlada

Alternative Name

Klangnurak, W.

Main Affiliation

School of Agricultural Technology

wanlada.kl@kmitl.ac.th

Now showing 1 - 10 of 18

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Dorsal fin morphology and phylogenetic insights in bamboo sharks (Chiloscyllium spp.)
(2026-05-01)
Laongdee, P.
;
Krajangdara, T.
;
Senanan, W.
;
Khudamrongsawat, J.
;
Panithanarak, T.
Two closely related species, C. hasseltii and C. griseum, showed overlapping shape variations in their first dorsal fins. However, the proportions of the first dorsal fin height/total length and the first dorsal fin inner margin/total length were observed to be significantly different between these two species. This difference can be integrated into the dichotomous key for Chiloscyllium. Phylogenetic analysis based on the cytochrome c oxidase I (COI) gene was consistent with the morphology of the first dorsal fin, indicating that C. punctatum differs from other Chiloscyllium species. However, phylogenetic tree based on the NADH dehydrogenase 2 (ND2) gene fragments grouped the clade of C. punctatum with other clades of Chiloscyllium. Most Chiloscyllium species formed monophyletic groups based on the two gene fragments, except for C. hasseltii and C. griseum, which clustered together. This research provides practical knowledge for field-based species identification and accurate classification within the genus Chiloscyllium, enhances our understanding of its phylogenetic relationships, and supports the future development of a field guide.
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DNA-based species identification of shark fins traded in thai markets
(2023-08-01)
Klangnurak, Wanlada
;
Arunrugstichai, Sirachai
;
Manopawitr, Petch
;
Krajangdara, Tassapon
Shark fins are among the most highly prized seafood products in the world with massive consumption in Asia over the past several decades. The demand for shark fins is a major driver of the enormous population declines of elasmobranchs that are generally vulnerable to overexploitation. This study aims to better understand the species composition of shark fin products in Thailand and their conservation statuses by using DNA-based species identification. Various types and sizes of shark fins were collected from 4 locations in Thailand. DNA barcoding method based on a fragment of the cytochrome c oxidase subunit I (COI) gene was applied to species identification. Fins from at least 15 shark species were found from Thailand’s markets. The spottail shark (Carcharhinus sorrah) and the night shark (Carcharhinus signatus) were the two dominant species presented in this study. 34% of identifiable samples are the species that have not been record in this region. 62% of species detected from the fin samples are categorized under the threatened categories of IUCN Red List. Species composition reported in shark fin products potentially helps indicate the appropriate conservation action and increases awareness from monitoring the trade in elasmobranch products.
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Four new species of Fauveliopsidae (Annelida, Sedentaria) from the Gulf of Thailand
(2026-01-01)
Plathong, Jintana
;
Plathong, Sakanan
;
Klangnurak, Wanlada
;
Salazar-Vallejo, Sergio I.
Four new species of Fauveliopsidae, Fauveliopsis pladang sp. nov., Laubieriopsis tantawan sp. nov., Riseriopsis chaba sp. nov., and R. plahmuk sp. nov., are described from the Gulf of Thailand from sediments at 50–80 m water depth. Fauveliopsis pladang sp. nov., can be distinguished from other species by having 41 chaetigers; anterior parapodia with two acicula chaetae per bundle; in median and posterior segments 1 aciculum and 1 capillary per bundle. Laubieriopsis tantawan sp. nov., differs from all other species in the genus by having 27–43 chaetigers, body annulate; 2 acicula per bundle in anterior parapodia; in median and posterior parapodia with 1 aciculum and 1 capillary per bundle. Riseriopsis chaba sp. nov., can be distinguished from other species by having 34 chaetigers; anterior parapodia with 2 acicula per bundle; median and posterior notopodia with one aciculum and one capillary per bundle; median neuropodia with 1 aciculum and 2 capillaries per bundle; posterior neuropodia with 1–2 acicula and 1 capillary per bundle. Riseriopsis plahmuk sp. nov., can be distinguished from other species by having 2–4 acicula per bundle along anterior segments; median segments with 1–2 acicula and 1–2 capillaries per bundle; and posterior parapodia with 1–6 acicula and 1–5 capillaries per bundle. Genetic data, sequencing of the cytochrome oxidase subunit I (COI) of L. tantawan sp. nov., and R. plahmuk sp. nov., are reported. Update keys for identifying species of Fauveliopsis, Laubieriopsis and Riseriopsis are also provided.
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Two new species of Sigambra (Annelida, Pilargidae) from the Andaman coast and the Gulf of Thailand
(2024-12-17)
Plathong, Jintana
;
Plathong, Sakanan
;
Klangnurak, Wanlada
;
Dean, Harlan K.
Two species of Pilargidae, Sigambra pakbaraensis sp. nov. and S. sirilukae sp. nov. are described from different coasts of Southern Thailand (Andaman Sea and the Gulf of Thailand). Both species belong to the subgroup of Sigambra which lack ventral cirri at chaetiger 2 and have capillary notochaetae. Sigambra pakbaraensis sp. nov. is described from the Andaman coast and can be distinguished from other species in the genus by the occurrence of the first dorsal hook at chaetiger 8, the presence of capillaries in notopodia, and 14 pharyngeal papillae. Sigambra sirilukae sp. nov. is described from the Gulf of Thailand and it is clearly distinguished from all other species in the genus by having 12 pharynx papillae, an elongate median antenna with a large ceratophore, dorsal hooks from middle chaetigers, and up to five capillary notochaetae from anterior most chaetigers (4–5). Molecular phylogenetic analyses, based on cytochrome oxidase subunit I (COI) and mitochondrial genes 16S, indicate S. pakbaraensis sp. nov. clusters within Sigambra Müller, 1858. Pores on the dorsal and ventral cirri of both species are herein described for the first time for the genus. An updated key to species of Sigambra from the Indo-Pacific region is also provided.
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Unveiling the species in shark-based pet snack products with an overview of e-commerce trends
(2026-01-01)
Klangnurak, Wanlada
;
Arunrugstichai, Sirachai
;
Manopawitr, Petch
Shark cartilage and whole-dried small sharks are increasingly being used in Thailand's pet snack market, raising sustainability concerns. This study examined the issues by identifying shark species in cartilage and whole-dried shark products used in pet snacks and analyzing online market trends. A total of 150 shark cartilage and 60 whole-dried shark samples were analyzed using DNA barcoding. Notably, 91 % of the cartilage products were identifiable at the species level, with eight shark species represented. The brown-banded bamboo shark (Chiloscyllium punctatum) and the Australian blackspot shark (Carcharhinus coatesi) were the most common, making up 63.2 % of samples. Of the identified species, 61.8 % are classified as Near Threatened on the IUCN Red List, and 67.7 % are from species listed in CITES Appendix II. All whole-dried sharks were Scoliodon macrorhynchos, also classified as Near Threatened and CITES-listed. Shark cartilage products dominated the market, appearing in 62–65 % of shops, compared to 35–38 % for whole-dried sharks. The findings emphasize the need to strengthen the monitoring and enforcement of CITES-listed sharks, improve traceability and transparency in the supply chain, and regulate the online market for shark-based pet snacks.
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Effects of dietary superworm (Zophobas morio) oil on growth and reproductive performance of female zebrafish (Danio rerio)
(2023-05-01)
Prachom, N.
;
Taveekijakarn, P.
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Panchakhan, S.
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Srinun, N.
;
Klangnurak, W.
There was not different effect on the growth performances between female zebrafish (Danio rerio) after feed with fish oil and superworm oil (Zophobas morio). Feed conversion ratio, weight gain and specific growth were not significantly different between the two groups of fish fed the different type of oils. There was not statistically significant difference on the reproductive performances. Gonadosomatic index was not significantly different between two groups of fish fed the different type of oils. The relative expression of ovulation-inducing genes including ptgs2a, sik1, and slc37a4a were not significantly differed when compared between female zebrafish after feed with fish oil and superworm oil. Results suggested that superworm oil may be used in female zebrafish diet with no adverse effects on both growth and reproductive performance.
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Mitochondrial DNA Analysis Suggests Invasion of Thailand Coast by a Single Species of Dreissenidae, Mytilopsis sallei
(2021-09-01)
Klangnurak, Wanlada
;
Wangkulangkul, Kringpaka
In 2001, a species of false mussel was recorded in coastal areas in southern Thailand. In 2008, established populations were reported in several estuaries and lagoons. Based on shell morphology, the bivalve was identified as a non-native species belonging to Dreissenidae. To date, populations have been observed in five locations in southern Thailand on both the Andaman and Gulf of Thailand coasts. The variation in shell morphology within and between these locations led us to question whether specimens in different locations belonged to different species. We used morphometric techniques to investigate variation in shell characteristics among the five locations and mtDNA (COI) analysis to investigate genetic variation. Shell characteristics varied among locations; the shell morphology of specimens from some locations on the Andaman coast appeared to be similar to that of specimens from the Gulf coast. Most specimens had long, prominent apophyses, but in some specimens they were rounded and not prominent. In spite of the high variation in shell morphology, molecular analysis indicated that all COI gene sequences of the specimens examined are nearly identical and belong to a single species, Mytilopsis sallei. Phylogenetic analyses also revealed the monophyly of 25 sequences between our specimens and other M. sallei sequences from GenBank, with high bootstrap support. Our recent findings suggest that the name M. sallei should be applied to the false mussel in southern Thailand. However, this merits confirmation with analysis using other molecular markers, and more specimens should be included.
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Spatial–temporal shifts of ponyfish (Perciformes: Leiognathidae) diversity in by-catch of trawl fishery, including morph variation of Photopectoralis bindus
(2022-01-01)
Klangnurak, Wanlada
;
True, James D.
Ponyfish (Perciformes: Leiognathidae) are a diverse group of mainly small, planktivorous fishes that comprise much of the teleost component found in the by-catch of trawlers in Thai waters. The generic taxonomy of ponyfish has been revised many times, which has resulted in confusion in the historical records of fishing data. Moreover, since two monsoon seasons affect the different coasts of Thailand at different times of the year, their effects are likely to have separate impacts on marine fish diversity in Thailand according to the time of year. By-catch samples totaling 25,439 ponyfish were collected from commercial fishing vessels during three sampling episodes in each of two Andaman Sea provinces and three provinces in the Gulf of Thailand. Ponyfish samples were identified to the species level and taxonomical ambiguity was dealt with by DNA sequencing against GenBank to identify the specie. From these data, the spatial and temporal community diversity and abundance were calculated. Richness and total abundance were significantly different between seasons but not between the two sides of the Thai peninsula. Diversity of ponyfish in bycatch was least during the monsoon transition period or the dry season. Morphological variation of Photopectoralis bindus has been a source of taxonomic confusion in the past, but here, the use of DNA sequencing in addition to body ratio data analysis reinforces taxonomic clarity and suggests population-level structuring that may explain these issues. These findings indicate the role of seasonal fluctuations in biodiversity maintenance for fisheries management in Thailand.
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Morphological and molecular insights into diversity of Brevitrygon (Elasmobranchii, Myliobatiformes, Dasyatidae) in Thai waters
(2026-01-01)
Wongmanee, Phiphat
;
Khudamrongsawat, Jenjit
;
Krajangdara, Tassapon
;
Senanan, Wansuk
;
Panithanarak, Thadsin
Stingrays of the genus Brevitrygon in Thailand are captured as bycatch in fisheries, and a proportion of the catch is used for local consumption, but information on their biodiversity remains limited. This study examines the diversity of Brevitrygon species collected from the Gulf of Thailand and the Andaman Sea. A total of 148 specimens were morphologically identified as either Brevitrygon heterura (Bleeker, 1852) or Brevitrygon cf. imbricata, based on diagnostic characters. Morphometric analysis revealed that all specimens more closely resembled B. heterura, with no significant differences between morphotypes or sexes. Genetic analysis based on COI sequences from 39 samples further supported these results. All samples grouped within the B. heterura clade with strong bootstrap support and formed two distinct genetic subgroups corresponding tothe Gulf of Thailand and the Andaman Sea. The mean intraspecific divergence (1.08%) fell within the expected range for population-level variation in elasmobranchs, with interspecific divergence from other Brevitrygon species exceeding 9%. These results indicate that B. heterura in Thai waters likely represents a single species. While both morphometric and genetic data suggest regional differentiation, the observed variation falls within the normal range for a single species, providing no evidence of cryptic diversity. This study underscores the value of integrating morphological and molecular data to better understand population structure and taxonomy in stingrays.
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Assessment of Bacterial Community and Other Microorganism Along the Lam Takhong Watercourse, Nakhon Ratchasima, Thailand
(2025-06-01)
Klangnurak, Wanlada
;
Hinthong, Woranich
;
Aue-umneoy, Dusit
;
Yomla, Rungtawan
Lam Takhong, a vital watercourse in Nakhon Ratchasima province, Thailand, supports agricultural, recreational, and urban activities. Originating in a national park, it flows through urban areas before discharging into a dam and running off via the sluice gate. While water quality monitoring is routine, microbial community data have never been reported. This study assesses the microorganism diversity and functional genes in Lam Takhong watercourse using a shotgun sequencing metagenomics approach. Water samples were collected from the upstream, midstream, and downstream sections. The midstream area exhibited the highest abundance of fecal coliform bacteria, plankton, and benthos, suggesting elevated pollution levels. Genes related to metabolism, particularly carbohydrate and amino acid pathways, were predominant. Proteobacteria was the most abundant phylum found in the water, with Limnohabitans as the dominant planktonic bacteria. Bacteria such as Staphylococcus, Mycobacterium, Escherichia, Pseudomonas, Enterococcus, Neisseria, Streptomyces, and Salmonella were detected, along with antibiotic resistance genes, raising public health concerns. These findings emphasize the need for microbial monitoring in the Lam Takhong to determine the potential water quality bioindicator and prevent potential disease spread through the water system.
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Klangnurak, Wanlada

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