This article is almost a leaf out of the koi club book on fish breeding and larval rearing! What do koi breeders do at the moment? Preparation of the pond can take 2 weeks to a month. Some introduce medium sized koi to the fry pond to consume any of the large predatory insect larvae. Approximately one week prior to introducing the fertilised eggs to the pond, the large fish are removed and the pond is fertilised. This will help establish ‘green water’. What’s in this ‘green water’? Is it just algae? Are there bugs in there that fish eat?
Read on to find out more.
Aquaculture Research
Volume 44, Number 3 (February 2013)
Experimental evaluation of inorganic fertilization in larval giant grouper (Epinephelus lanceolatus) production
Authors: Kwee Siong Tew, Pei-Jie Meng, Hsi-Sheng Lin, Jian-Hua Chen, Ming-Yih Leu
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Source: Aquaculture Research, Volume 44, Number 3 (February 2013)
Page Numbers: 439 – 450
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Abstract: A major constraint in successful larviculture of groupers has been the small gape of the larvae and hence the requirement for small prey at first feeding. In this study, we examined how maintaining a phosphate concentration of 100 µg P L-1and an inorganic nitrogen (N) level of 700 µg N L-1 via weekly fertilization with inorganic fertilizers affected phytoplankton, zooplankton and giant grouper larval survival in relation to a control group that was provided with rotifers immediately after larvae hatched. Unicellular algae, zooplankton within the size ranges of 10–50 µm and 50–100 µm and survival of giant grouper larvae were all significantly higher in the fertilized treatment compared with the control. Stomach analysis revealed that ciliates and flagellates were actively consumed by larval fish in the fertilized group, whereas few rotifers were consumed in the control. We conclude that the inorganic fertilization method provides high densities of suitable-sized prey for larval groupers at the onset of exogenous feeding before they are able to consume larger, commercially available rotifers and copepods.
Citation: Kwee Siong Tew, Pei-Jie Meng, Hsi-Sheng Lin, Jian-Hua Chen, Ming-Yih Leu . Experimental evaluation of inorganic fertilization in larval giant grouper (Epinephelus lanceolatusBloch) production. Aquaculture Research, Volume 44, Number 3 (February 2013), pp. 439-450,
URL: http://ejournals.ebsco.com/direct.asp?ArticleID=454495BEFA1675A435E7
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Yours sincerely,
Dr Richmond Loh
BSc, BVMS, MPhil (Vet Path), MANZCVS (Aquatics), MANZCVS (Pathobiology), DipPM.
Veterinarian | Adjunct Senior Lecturer Murdoch University | WAVMA President-Elect |
Secretary Aquatic Animal Health Chapter – Australian and New Zealand College of Veterinary Scientists (ANZCVS)
The Fish Vet, Perth, Western Australia, AUSTRALIA.
Mobile Veterinary Medical & Diagnostic Services for fish and other aquatic creatures.
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383
