Agriculture, Fisheries and Conservation Department


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Technological development

Adaptive development studies are conducted to improve productivity and enhance sustainability of the local aquaculture industry. To provide greater variety of choice of species for culture and to enhance the competitiveness of Hong Kong fish farmers, continuous effort is made to identify suitable new species with good market potential for extension to farmers.

Culture trials of Jade Perch

In 2004, we conducted collaborative trials on culture of Jade Perch and the results were successful. However, the fry of Jade Perch from Australia are produced in November to January of the next year in the spring of the southern hemisphere which are the fall and winter months of Hong Kong. Therefore, the fry have to be kept in Australia until the winter has passed and then transported to Hong Kong for stocking in spring. This may increase the cost of rearing and transportation of the fish fry considerably. We therefore conducted trials on hatching of Jade Perch eggs in 2005 and 2006 with a view to reducing the cost of fish fry from import. Batches of fertilized eggs were imported from Australia and the eggs were hatched and reared in temperature controlled tanks and concrete ponds. The trial was successful. Altogether about 14,000 juvenile fish were sold to local fish farmers for stocking into appropriate ponds in July 2005 and May 2006.

Starting from 2007, AFCD has successful produced Jade Perch fry with a view to help fish farmers secure a stable supply of fish fry at lower costs.

Jade Perch Larvae


[Jade Perch Larvae - Day 1]
Day 1
[Jade Perch Larvae - Day 3]
Day 3

[Day 8 - first feeding]
Day 8 - first feeding
 
[Fry in tank ]
Fry in tank
[Fry in concrete pond]
Fry in concrete pond
[Fingerling ready for stocking]
Fingerling ready for stocking
[Jade perch stocked in pond]
Jade perch stocked in pond
[Marketable size Jade Perch]
[Jade Perch]


Culture trials of other species

 

Trials on culture of hybrid-striped bass and sleepy cod were completed in 2005. The collaborative trial on hybrid-striped bass with fish farmers was successful. With pellet feeds dispensed by automatic feeding machine, the fish grew fast and reached marketable size in 6 to 8 months. The flesh of hybrid-striped bass has few bones and tastes good. On the other hand, the growth of sleepy cod in the trials was relatively slow but the flesh was tender and tasted good. Fish farmers showed initial interest and considered it a good choice for stocking in polyculture ponds as it may fetch higher price than other freshwater fish.

[Hybrid-striped bass ]
Hybrid-striped bass 
[ Sleepy cod]
 Sleepy cod

Promotion of pellet feeds

Continuous effort is being made in promoting the use of pellet feed to replace trash fish, traditional feed for aquaculture.


Dry pellet fish feed is getting popular among aquaculture industry in the last few years. The main ingredient of dry pellet fish feed is fishmeal, protein from other animal or plant origin, fish oil or other kinds of lipids, vitamin premix, minerals and binders are also added in accordance with the nutritional requirement of the target cultured species. The combined ingredients are extruded into pellets of different sizes and densities to suit the feeding behavior of different types of cultured fish. Dry pellet fish feed can significantly reduce pollution caused by fish feeding and improve both the feed efficiency as well as fish health. Commercially available dry pellet fish feed are collected regularly for nutritional analysis to assist fish farmers in choosing suitable dry pellet fish feed.

[Pellet feed]
pellet feed

[trash fish]
trash fish


  Telephone No.
Techniques & management /Pond fish culture 2471 9174
Techniques & management /Marine fish culture 2150 7083

 

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Last Review Date : 04 July 2017