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Redescription of Bagrichthys Macropterus and Comparing It with B Turkish Journal of Fisheries and Aquatic Sciences 9: 09-15 (2009) Redescription of Bagrichthys macropterus and Comparing it with B. macracanthus, B. majusculus and B. obscurus Chaminwat Philasamorn1, Rojchai Satrawaha1,* 1 Mahasarakham University, Walai Rukhavej Botanical Research Institute, Mahasarakham, 44150, Thailand. * Corresponding Author: Tel.: +66.4375 4407; Fax: +66.4375 4407; Received 18 February 2008 E-mail: [email protected] [email protected] Accepted 04 November 2008 Abstract Descriptive morphological and morphometric characters for 45 parameters and weight-length relationship of 30 tropical freshwater bagrid catfish, Bagrichthys macropterus (Bleeker, 1853), from the Mun river in northeastern Thailand were investigated. The aim of this study was to quantify morphological differences between Bagrichthys macropterus and B. obscurus Ng, 1999. The results revealed that fin spines for the anal, caudal, dorsal, pectoral, and ventral fins were ii-iv/11-13; 8/7; I,7; I,7-8; and I,5, respectively. And gill rakers were 7-10. Serrations of the dorsal and pectoral spines were 13-15, 22-25, respectively, on posterior margin. Mandibulary teeth were not found on all tooth-bearing surfaces. All four pairs of barbel were longer in males than in females (P<0.05). Morphologically, this species is very similar to B. obscurus, but can be differentiated by caudal peduncle depth, nasal barbel length and serrations of the dorsal and pectoral spines. Keywords: bagrid catfish, Bagrichthys macropterus, B. macracanthus, B. majusculus, B. obscurus, tropical freshwater fish, morphometry. Introduction a shorter adipose-fin base, and the genital papilla in males meeting the base of the first anal fin ray. The Bagridae is a tropical freshwater fish family Besides, Ng (2002) diagnosed 4 specimens of B. with 27 genera containing 205 species reported majusculus from Thailand that had been accumulated from 1970 to 1975 preserved in globally (Nelson, 1994). One highly specialized genus is Bagrichthys, which is reported distributed in large, USNM. He reported that B. majusculus was very muddy rivers throughout South-East Asia including similar to B. macracanthus and B. vaillantii. These Indonesia, Malaysia, Cambodia and Thailand (Roberts, species differ from other congeners in having a 1989; Rainboth, 1996). This genus is typically unique combination of a relatively large and broad characterised by an elongate body and laterally mouth, moderately long dorsal spine with 15–27 serrations, inner, chin and mandibular barbel with straight compressed caudal peduncle. Its dorsal fin is spiny with dorsally-directed serrations on the posterior edge margins, the dorsal-spine length was 24.4–32.5% of the and a long adipose fin without a free posterior margin, standard length (SL), maximum adipose height was 9.9– the gill membranes united at its isthmus (Roberts, 10.5% SL, and caudal peduncle depth was 7.1–7.5% SL. 1989; Mo, 1991). Seven species are currently The genus Bagrichthys is uncommon in recognised in South-East Asia including: Bagrichthys Thailand, particularly the 2 new species reported by Ng. It may be reasonable to presume by lacking of hypselopterus (Bleeker, 1852), B. macropterus (Bleeker, 1853), B. macracanthus (Bleeker, 1854), B. records indicate that these two species have vaillantii (Popta, 1906), B. micranodus (Roberts, disappeared from Thai freshwater fauna. Previous 1989), B. obscurus (Ng, 1999) and B. majusculus occurrences of B. macracanthus have been reported in (Ng, 2002). the Mun River (Doungsawat and Choekachorn, 1991; Taxonomy of Bagrichthys had been confused as Saenjundaeng, 2001), and the Bangprakong River (Saenjundaeng, 2001). B. macropterus was also different fish taxonomists had applied their own ideas. Recently, Ng (1999, 2002) classified two new species reportedly found in the Chaophraya River (Smith, in this genus: B. obscurus (Ng, 1999) and B. 1945) and in lower part of Mun River (Doungsawat majusculus (Ng, 2002). For B. obscurus, he and Choekachorn, 1991; Dumrongtripob et al., 1998; investigated 9 preserved specimens at the Chaengkij et al., 2004; Pilasamorn, 2004). Occurrence University of Singapore National Museum (USNM) in other rivers in Thailand has never been reported. B. macropterus is a tasty species after cooking. that were collected in Thailand from 1923 to 1975 for the first species, reporting that B. obscurus was It is also well known as a popular aquarium fish since morphologically very similar to B. macropterus in it has a unique, beautiful colour and is suitably sized general, but differentiated in having a uniformly to be raised in small indoor aquaria, as well as being a brown body without a pale midlateral stripe and no highly tolerant species. Bleeker was a pioneer pale blotches on the body sides, a more slender body, working on the identification of B. macropterus © Central Fisheries Research Institute (CFRI) Trabzon, Turkey and Japan International Cooperation Agency (JICA) 10 C. Philasamorn and R. Satrawaha / Turk. J. Fish. Aquat. Sci. 9: 09-15 (2009) Bleeker, 1853 (type locality: Muara Kompeh, River. Samples came from three districts in Sumatra). He originally classified it as Ubonratchathani province, North-East of Thailand: Pseudobagrichthys macropterus Bleeker, 1862. Later Khongjiam, Phiboonmongsaharn and Varinchaumrarb Günther (1864) accepted it as Bagroides macropterus (Figure 1). A pulsed - DC 220 V 650 W electro fishing Günther, 1864 with which Smith (1945) concurred for unit with a ring anode was used. The unit was applied fish studied in Thailand. Finally, in working on bagrid from a fibreglass boat. Each fish specimen was sexed, fish in Japan, China, Malaysia and Indonesia, Jayaram weighted and measured fresh in the field. Sexing was (1968) classified this species as B. macropterus. made by observing the appearance of the genital papillae However, Roberts (1989) suggested for western in males (Figure 2). Weight and length were recorded Borneo Indonesia the separation of B. macropterus in g and cm, respectively. Measurements were made on into a genus by the characteristics of mouth opening the left side of specimen (Figure 3a). A morphometric being relatively small and narrow, oral dentition study was performed for each sex. The mean data extremely reduced, jaws and palate with a few measured were compared. scattered teeth (sometimes apparently absent) deeply Fin ray and gill raker counts were obtained under a buried in soft tissue, dorsal fin spine relatively short binocular dissecting microscope using transmitted light. with 15 or fewer serrations, chin and mandibular barbel The subunits of the head are presented as a proportion of strongly crenulated, colour in life pale brownish or tan head length (HL); head length and measurements of with whitish or cream-colored light areas. body parts were given as proportion of the standard This study aimed to record detailed length (SL). Morphometric details follow Anseeuw et characteristics for this species under field conditions al. (2005) and Eschmeyer (1998). T-tests (Sokal and and to provide the first analysis of its morphometric Rohlf, 1995) were used to compare sexes. study. The knowledge obtained from this study is Morphological descriptions and measurements were expected to facilitate the proper classification of B. grouped into 8 categories as follows: macropterus in Thailand and to aid in its 1. Body length composed of a total length (TL; 1) conservation. measured from the tip of the snout to the end of the caudal fin, Fork length (FL; 2) measured from the tip of Materials and Methods the snout to the origin of the caudal fin fork and standard length (SL; 3) taken from the tip of the snout A total of 30 B. macropterus specimens were to the base of the caudal fin (Figure 3a). collected from January to May, 2007 from the Mun 2. Body distance: point to point lengthwise from 1 2 3 1= Varinchaumrarb district 2 = Phiboonmoangsaharn district 3 = Khongjiam district Figure 1. A map of Thailand showing sampling sites. C. Philasamorn and R. Satrawaha / Turk. J. Fish. Aquat. Sci. 9: 09-15 (2009) 11 Ventral fin Genital papillae Anal fin Female Male Figure 2. The ventral view of caudal flexure of a Bagrichthys macropterus showing the genital papillae (in males). Figure 3. The left side body of Bagrichthys macropterus showing measurement of body lengthwise (a), the head dorsal view (b), and the head ventral view (c). the tip of the snout to the origin of the fin including origin to the end of ventral fin base (Fig 3a). preanal length (PrAL; 4) measured from the tip of the 4. Body distance point to point lengthwise as a snout to origin of the anal fin, preventral length (PrVL; 5) fin to fin distance including dorsal fin to caudal fin measured from the tip of the snout to origin of the distance (Df-Cf; 15) measured from origin of the ventral fin, preadipose length (PrAfL; 6) measured from dorsal fin to base of the caudal fin, pectoral fin to anal the tip of the snout to origin of the adipose fin, predorsal fin distance (Pf-Af; 16) measured from origin point of length (PrDL; 7) measured from the tip of the snout to the pectoral fin to origin of the anal fin, anal fin to caudal origin of the dorsal fin and prepectoral length (PrPL; 8) fin distance (Af-Cf; 17) measured from origin of the measured from the tip of the snout to origin of the anal fin to base of the caudal fin, dorsal fin to anal fin pectoral fin (Figure 3a). distance (Df-Af; 18) measured from origin of the dorsal 3. Body distance point to point lengthwise from fin to origin of the anal
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