Fish surveys were conducted between 2011 and 2017 in the Brantian drainage, Sabah, Malaysia. The fish fauna of the Brantian drainage includes a total of 34 species in 14 families, of which 23 species are reported from this drainage for the first time. All recorded species except one (Oreochromis mossambicus) are native, and 25 species are endemic to Borneo. Rasbora pycnopeza, new species, is described herein, based on specimens from the Brantian drainage. Specimens of the new species were earlier identified as R. sumatrana, from which it is distinguished by a combination of characters, including: geographic distribution, slender body and distinctive caudal-fin colour pattern consisting of a thick distal black margin (covering ⅓ to ½ of upper and lower caudal fin lobes); a thin black lateral stripe and a black supraanal stripe.

Fish surveys were conducted between 2011 and 2017 in the Brantian drainage, Sabah, Malaysia. The fish fauna of the Brantian drainage includes a total of 34 species in 14 families, of which 23 species are reported from this drainage for the first time. All recorded species except one (Oreochromis mossambicus) are native, and 25 species are endemic to Borneo. Rasbora pycnopeza, new species, is described herein, based on specimens from the Brantian drainage. Specimens of the new species were earlier identified as R. sumatrana, from which it is distinguished by a combination of characters, including: geographic distribution, slender body and distinctive caudal-fin colour pattern consisting of a thick distal black margin (covering ⅓ to ½ of upper and lower caudal fin lobes); a thin black lateral stripe and a black supraanal stripe.

http://hdl.handle.net/2027.42/122721

The featured list is compiled from the first qualitative survey of Singapore Quarry’s aquatic biodiversity since it was incorporated into the Dairy Farm Nature Park by the National Parks Board in 2009. It must be noted that this body of freshwater was formed out of a disused granite quarry, and fed by rains and small streams flowing from Bukit Timah Hill. The aquatic fauna, whether locally native or otherwise, would have colonised the quarry from nearby sources of freshwater, or more likely (as with the fishes) introduced by humans Of the ten species of fish, five (50%) can be regarded as native to Singapore. These are Barbodes lateristriga, Aplocheilus panchax, Oxyeleotris marmorata, Trichopodus trichopterus and Channa striata. All the non-native fish species have been previously recorded from reservoirs and elsewhere in Singapore (Ng & Tan, 2010). In addition, one example of the red giant gouramy (Osphronemus laticlavius), presumably an abandoned pet, was recorded from Singapore Quarry in October 2010 (Lim, 2013). Of the two shrimps, only Cardina johnsoni is native to Singapore (Cai et al., 2007). Among the molluscs, only Melanoides tuberculata and Tarebia granifera are considered to be native to Singapore. The specific identity of the golden apple snail is unconfirmed pending further investigation. The two species known to occur in Singapore are best distinguished using molecular genetic methods (Ng et al., 2016). Note: The contributors thank the staff of Bukit Timah Nature Reserve (in particular Cheryl Chia and Lily Kwan), for logistical support and permission to participate in this survey. They are also grateful to Cai Yixiong for identifying the shrimps, and to Ng Ting Hui and Tan Siong Kiat for identifying the molluscs. The sizes of the fish are given in standard length (SL), measured from the tip of the snout to the base of the caudal fin. For the shrimps, TL refers to total length. For the molluscs, SH refers to shell height of the gastropods and SW refers to shell width of the bivalves.

The fish fauna of the Kranji Marshes has been treated by Baker (2013), Lim & Tan (2011, 2012) and Lim et al. (2013). The present report seems to be the first compilation that includes invertebrates such as shrimps and snails. Of the 18 species of fish recorded, only eight are regarded as native to Singapore. These are Dermogenys collettei, Monopterus javanensis, Oxyeleotris marmorata, Anabas testudineus, Betta imbellis, Trichopodus trichopterus, Trichopsis vittata and Channa striata. All the introduced fishes have previously been recorded from reservoirs and elsewhere in Singapore (Ng & Tan, 2010). Two species of shrimp are recorded, and only Caridina johnsoni is native (see Cai et al., 2007). Thirteen species of gastropod molluscs are recorded, but only Pila scutata and Melanoides tuberculata are confirmed to be native to Southeast Asia. Of the other eleven gastropods, the specific identity of the South American Pomacea sp. is unconfirmed pending further investigation. Pomacea canaliculata and Pomacea maculata, the two species of South American apple snails known to occur in Singapore, are best distinguished using molecular genetic methods (Ng et al., 2014). Note: The contributors are grateful to the staff of Sungei Buloh Nature Reserve (in particular How Choon Beng and Chua Yen Kheng) for logistical support and permission to participate in this aquatic survey; and to Cai Yixiong for identifying the shrimps. The sizes of the fish are given in standard length (SL), measured from the tip of the snout to the base of the caudal fin.