Li wrote:
>Table 2, The survival rates came from counting the number of fish.
>In slurry pond, the stocking number of Tilapia was 821, but the
>number of fish harvested was 9,080. Here a footnote was
>missing. It should add a symbol of ** to indicate that there
>were 8,259 fingerlings, which were self reproduced plus the
>stocked 821, and the total should be 9,080.

John Harris [jfhdally@agn.net.au] asked:
> Q1: After 202 days there where 8,259 Tilapia fingerlings in the slurry
> pond whereas the Manure pond had only adults. Are these fish
> normally so prolific this young?

Li responded:
>Q1: Yes. If the fish stocked are winter fingerlings of Tilapia oreochromis
>nilotica can grow from fry to adult in six months in Jiangsu Province and
>five months in southern provinces and then they begin to reproduce.

Table 2 showed a very impressive survival of the number of stocked
fingerlings to adults. In the manure-fed pond, eventhough grass was
provided and grass was not provided in the slurry-fed pond, of the 10
grasscarp fingerlings stocked in manure-fed pond, 5 of them died. Where
else you got 100 % survival of grass carp in slurry-fed pond without grass.

Q: is this a common survival rate of grasscarp (100 %) or was it a special
case in the manure-fed pond where survival was low (50%) for some reasons,
if known.

Q: is the survival of Tilipia, Crucian carp, common carp and Bream usually
100 % ? Since aeration is provided for the ponds, are there any other
factors that you ensured in order to have good survival of the fingerlings
? Do you have any predation by birds ?

regards
jacky