1. live feeds production

The foundation of larval rearing in marine fish and many other fish species is live feed production.
Commercial dry feeds, while being the first choice based on convenience, are generally not attractive to larvae less than 25 days .It is believed that motion is an important stimulus which elicits early feeding behavior. Providing inanimate dry feed particles is therefore unsuitable until the larvae become more developed
Culture techniques have been developed for a number of live feed organisms, with two of the most common being the rotifer, Brachionus plicatilis and the nauplius stage of Artemia Salina. Both of these organisms are extensively used for sea bream, sea bass and mullet larval rearing. Rotifers, which rang in the size from 100- 200 micron, are provided during the first 21-28 days, while Artemia nauplii (450-500 micron) are provided on day 13 until the fry are harvested.
The nutritional quality of rotifers as a larval fish feed is related to the quality of feed they are provided while being cultured. The most common types of rotifer feeds are microscopic unicellular algae and yeast, as they both contain high levels of highly unsaturated fatty acids (HUFAs). Algae are third type of live feeds culture required for marine fish larval rearing.
Micro algae are use in marine hatcheries as a food source for larvae

TYPES OF MICROALGAE USED IN MARINE HATCHERIES

1. Nannochloropsis Oculata

2. Isochrysis Galbana

3. Tetraselmis Cuecica

** CHRACTERISTICS OF Nannochlopsis Ocualta
1. Belong to Golden Brown Algae
2. No motile algae
3. Small size 2 – 3 Micron
4. High unsaturated fatty acids (HUFAS)
5. Cell count reach 60 million per ml
6. Used as food source for Rotifers, Clams, marine fish larvae and larvae shrimp
7. The optimum conditions of algae growing
TEMP 20 - 22 C0
LIGHT 2500 - 5000 LUX
SATINTY 25 - 27 PPT
PH 8.2 - 8.7

** CHRACTERISTICS OF Isochrysis Galbana
1. Belong to Golden Brown Algae
2. Motile cell with 2 flagella
3. Golden in color and has a red eyespot
4. Used as food sours for Rotifers, Clams, marine fish larvae and larvae shrimp
5. Cell count reach 15 million per ml
6. The same conditions but temperature need higher than
Nannochloropsis Oculata

** CHARACTERISTICS OF Tetraselmis suecica
1. Belong to green algae
2. Motile with 4 flagella
3. 9 – 10 MICRON wide, 12 - 14 MICRON long
4. Used as food source for Rotifers, Clams,
5. Cell count reach 4 million per ml*************************************************************