What are live foods?
Able to swim in water column, Constantly available to fish and shellfish larvae, Likely to stimulate larval feeding response.
What is plankton?
the diverse collection of organisms that live in large bodies of water and are unable to swim against a current.
Why fish hatchery needs live feed?
Larval rearing success largely depends on fish larvae feeding
When fish larvae starts to eat? How many days old?
3 or 4-day-old
Give THREE (3) characteristics of fish fries.
Delicate and small, Power of movement + ability to feed - weak, Their diet is restricted to a number of items, Very low adaptive to environment.
Give TWO (2) reasons why fish larvae won't eat pellet?
Small size (small mouth size), Uncompleted development of their perception organs (eyes, chemo receptors), Digestive systems. Cant produce enzyme for digesting
Why hatchery has to culture microalgae?
food source for zooplankton, bivalve, gastropod, fish larvae, shrimp larvae
Give THREE (3) reasons why rotifer is so popular among fish hatcheries?
Tolerance to a wide range of environmental conditions, High reproduction rate, Small size, Slow swimming velocity.
Why Daphnia is not suitable for marine fish species?
Freshwater species, Low content of essential fatty acids, Low HUFA
Give TWO (2) differences between moina and daphnia
Moina is smaller in size, higher protein content.
Microalgae reproduce asexual or sexual?
Asexual and sexual
When rotifer reproduce sexually?
when environmental conditions are stressful.
Artemia is freshwater or seawater species?
seawater
Artemia can produce eggs asexually?
No. It reproduce sexually.
Daphnia can reproduce asexual and sexual?
Asexual and sexual
