Induced spawning, larval development and rearing of two indigenous Malaysian mahseer, Tor tambroides and T. douronensis   总被引：2，自引：0，他引：2  

Brett Ingram  Stephen Sungan  Geoff Gooley  Sih Yang Sim  David Tinggi  & Sena S De Silva 《Aquaculture Research》2005,36(10):983-995

The Mahseers (Tor spp.) are highly valued freshwater fishes across the Himalayan and South‐east Asian regions. Over exploitation of natural stocks because of high demand and the deteriorating environmental conditions have resulted in marked decline of mahseers in the wild. Malaysian mahseers, T. tambroides (Bleeker) and T. douronensis (Valenciennes), locally known as empurau, kelah or belian and semah, respectively, have significant cultural and economic importance but both species are now threatened in the wild because of environmental degradation and over fishing. A captive breeding programme was instigated to attempt to propagate these two species artificially for conservation and aquaculture purposes. Both pond‐reared and tank‐held T. tambroides and T. douronensis reached sexual maturity in captivity and were successfully induced to spawn using hormone treatments. Ovaprim (0.5 mL kg^?1) was the most successful hormone treatment for both species. Pre‐treatment of fish with Ovaplant (28–68 μg kg^?1, 2–7 weeks before spawning induction) greatly improved the success rate of spawning induction. Repeat spawning (within 4 months of initial spawning) was induced in some captive fish. Use of formalin baths improved hatching by preventing fungal infections. Embryonic development and hatching are described. Juveniles were reared in static greenwater ponds. Tor tambroides reached 142–179 g (max 270 g) in 60 weeks. These results represent the first successful captive spawning and rearing of both species. Options for future research to improve production are discussed.  相似文献   

Development of a feeding strategy for silver perch, Bidyanus bidyanus (Mitchell), based on restricted rations   总被引：1，自引：0，他引：1  

Stuart J Rowland  Geoff L Allan  Charlie Mifsud  Mark Nixon  Peter Boyd  & David Glendenning 《Aquaculture Research》2005,36(14):1429-1441

To develop a feeding strategy for the Australian freshwater fish silver perch (Bidyanus bidyanus Mitchell), a series of eight experiments was done in 1 m³ cages in an aerated, earthen pond to determine the effects of feeding rate (% body weight) and feeding frequency (no. of feeds day^?1) on the growth and feed conversion ratio (FCR) of fingerlings and larger fish under ambient water temperatures over the range 13.8–30.6°C. Fish were fed extruded pellets of a silver perch diet containing 34% digestible protein and 14 MJ kg^?1 digestible energy. Commercial silver perch farmers were consulted about feeding practices for large fish (>500 g) and at water temperatures below 12°C, and winter feeding practices for other warmwater species were used to complete the strategy. In the feeding experiments, growth and FCR increased with increasing feeding rates to a level above which only FCR increased. Optimal feeding rates and frequencies were those which resulted in maximal growth, while minimizing effort (feeding frequency) and FCR. The highest feeding frequency required for maximal growth, including that of small fingerlings was twice (2 ×) daily, and the optimal feeding rates varied with water temperature and size of fish. The optimal daily regimes were: small fingerlings (initial mean weight, 2.0 g) 7.5% 2 × at a mean temperature of 23.3°C; fingerlings (14.9–27.7 g) 7.5% 2 × at 27.1°C, 5.0% 2 × at 23.7°C and 2.0% 1 × at 16.8°C; and large silver perch (162.5–510.6 g) 0.5% 1 × daily or 1.0% on alternate days at 15.6°C, 1.0% 1 × at 17.3°C, 3.0% 2 × at 24.1°C and 2.0% 2 × at 27.9°C. It is suggested that regimes of 0.5% 1 × daily for fingerlings (<50 g) and 0.5% 1 × on alternate days for larger fish are used at temperatures of 9–12°C, and 0.5% 3 days week^?1 and 0.5% 1 day week^?1 for fingerlings and larger fish, respectively, at 6–9°C. Feed inputs should not exceed 150 kg ha^?1 day^?1 in ponds less than 0.3 ha and 100 kg ha^?1 day^?1 in larger ponds. Our research has established a feeding strategy for silver perch based on restricted rations.  相似文献   

Prospects and problems: considerations for smallholder cattle grazing in oil palm plantations in South Kalimantan,Indonesia     

Bremer  Jori A.  Lobry de Bruyn  Lisa A.  Smith  R. Geoff B.  Darsono  Wahyu  Soedjana  Tjeppy D.  Cowley  Frances C. 《Agroforestry Systems》2022,96(7):1023-1037

Current Indonesian beef production only meets 45% of local demand. Increasing local beef production through integration of cattle production in pre-existing oil palm plantations is a possible solution to meeting this shortfall. The oil palm understorey provides feed, alleviating the need to convert additional land to agriculture. Smallholders are important contributors to both Indonesian cattle and palm oil production. This case study research seeks to understand key aspects of smallholder cattle management in palm oil production areas, to highlight opportunities and barriers to cattle integration. Thirty-nine smallholder cattle farmers from four villages in South Kalimantan were individually interviewed. The lack of alternative feed sources was the major driver towards the adoption of cattle production using oil palm understorey as feed. Cattle grazing was uncontrolled due to labour shortages and occurred in individually owned and ‘plasma’ plantations, with cattle penned at night where possible to avoid theft. Arrangements on land access and use between stakeholders are needed for systematic cattle grazing and to control cattle theft.

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Identification of anthracnose resistance in yellow lupin (Lupinus luteus L.) and its incorporation into breeding lines     

Kedar N. Adhikari  Geoff Thomas  Bevan J. Buirchell  Mark W. Sweetingham 《Plant Breeding》2011,130(6):660-664

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Moso bamboo (<Emphasis Type="Italic">Phyllostachys edulis</Emphasis> (Carriere) J. Houzeau) invasion affects soil phosphorus dynamics in adjacent coniferous forests in subtropical China     

Chunsheng Wu  Qifeng Mo  Hankun Wang  Zhijian Zhang  Guoxian Huang  Qing Ye  Qin Zou  Fanqian Kong  Yuanqiu Liu  G. Geoff Wang 《Annals of Forest Science》2018,75(1):24

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Comparing morphology and physiology of southeastern US <Emphasis Type="Italic">Pinus</Emphasis> seedlings: implications for adaptation to surface fire regimes     

Lauren S. Pile  G. Geoff Wang  Benjamin O. Knapp  Guohua Liu  Dapao Yu 《Annals of Forest Science》2017,74(4):68

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