Na Hang Nature Reserve, Tat Ke Sector - Frontier-publications.co.uk

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Na Hang Nature Reserve, Tat Ke Sector 1997 8.4.2 Aquaculture Within the Tat Ke sector, fish are cultivated in artificial ponds (200-600m 2 in surface area) and rice-paddies. The species involved include the Common Carp (Cyprinus carpio), White Carp (Hypophthalmichthys molitrix), Cirrhina molitorella, Spinibarbichthys denticulatus, Grass Carp (Ctenopharyngodon idella), Indian Carp (Labeo rhohita, Labeo mrigala), and Tilapia (Tilapia mossambica). The yield of cultivated fish is about 300-400kg/ha in the rice fields and 1500-2500kg/ha in the ponds, but during the wet season in the Tat Ke sector flash-floods often occur, washing pond fish out to streams and rivers. After these floods only the Common Carp (C. carpio) remains in the rice fields; most of the other species are washed away and the yield of cultivated fish decreases. For this reason, Common Carp is now the only species deliberately reared in the rice fields, and Common and Grass Carp are the main species reared in the ponds. Pond-reared Common Carp spawn in the spring (February to March), and young carp from these spawnings are used to stock rice paddies. Sometimes fish are caught from the River Nang and stocked in the ponds. These include Cirrhina molitorella and Spinibarbichthys denticulatus. The species Barbatula caudofurca and Zacco spilurus occasionally swim into the irrigation channels which feed the rice fields. Frontier-Vietnam Environment Research Report 9 32
Na Hang Nature Reserve, Tat Ke Sector 1997 9.0 AMPHIBIANS AND REPTILES 9.1 Introduction Previous studies of the Na Hang area have resulted in extensive species lists (65 species of reptile and 18 amphibians were recorded by Dang Huy Huynh, 1993). More recently, the reserve has hosted a foreign herpetological research expedition in 1996 (R. Murphy, Royal Ontario Museum, pers. comm.). During the previous SEE research in Na Hang's Ban Bung sector (Hill and Kemp, 1996), conditions for the collection of reptiles in particular were poor (cool, damp weather conditions meant that reptile activity was restricted), and relatively few species were taken. 9.2 Methods At Tat Ke, amphibians and reptiles were collected on sight, and, in the case of snakes, where they had been killed by local people. An effort was made to collect only one specimen of each species, although with certain species (particularly the Oriental Whip Snake or Vine Snake, Ahaetulla prasina, which has green and grey-brown colour phases) several specimens were taken. Tortoises were also observed in the wild, and after collection by locals. Preliminary identification of snakes was carried out in the field using A Field Guide to the Snakes of South Vietnam (Campden-Main, 1975), and The Snakes of Thailand and their husbandry (Cox, 1991). All specimens were identified in Hanoi by Dr Nguyen Van Sang of IEBR. 9.3 Results A list of the amphibian and reptile species collected or observed during the phase is given in Appendix 6. A large number of frogs were collected in pitfall traps set to collect insects (see Chapter 6, above), but these all proved to belong to one species, Rana limnocharis. 9.4 Discussion The most commonly seen reptile was the arboreal snake Ahaetulla prasina, which appeared to be common in the scrub and secondary forest close to the base camp. Specimens of six other snake species were collected, and several more were observed in the field but could not be positively identified. Two of the reptiles collected in the Tat Ke sector are listed as 'Threatened' in the Red Data Book of Vietnam (RDB, 1992). The small arboreal agamid lizard Acanthosaura lepidogaster is threatened particularly by forest loss, although widely distributed in Vietnam (particularly the North). The snake Elaphe moellendorffii is restricted to Frontier-Vietnam Environment Research Report 9 33
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Page 70 and 71: Appendix 1. Habitat; Plants Plant s
Page 72 and 73: Species Habitat Fertile Uses/Status
Page 86 and 87: stages SONNERATIACEAE 638. Duabanga
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Species Habitat Fertile Uses/Status
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FOREST TRANSECT 1 Key: Ac Ao Ar Cl
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FOREST TRANSECT 3 Key: Cl Clusiacea
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Appendix 3. Forest plot data
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Myrtaceae 4 1.081 3.60 8 1.250 4.66
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Nymphalidae 32. Cethosia biblis Dru
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Appendix 4b. Butterflies recorded a
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1 2 3 4 5 25 Opsarichthys uncirostr
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Appendix 6. Amphibians and Reptiles
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A B C Upupipae: Hoopoe 14. Hoopoe (
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A B C Subfamily Muscicapinae: Flyca
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7b. Formulation used for the assess
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Appendix 8. Key; A Identified from:
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Appendix 9. List of specimens Insec
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