Give THREE (3) benefits of live feed.
triggered effect by their continuous movement, Enhanced perception by the feeding larva, good distribution of food,
Name the organism.
Moina
What are live food?
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.
Name the organism.
Copepod
Give TWO (2) limiting factors in selecting food for the first-feeding period.
Small mouth size, undeveloped perception organs, digestive system, cant produce enzyme to digest non-living diet.
Give the criteria of 2 types of larvae found in fishes
Precocial larvae - developed digestive system; Altricial larvae - lacking of a stomach
Give TWO (2) criteria for the food source that is suitable for fish larvae.
Easily digestible, contain enzyme for autolysis, supplies all essential nutrient required by the larval.
Give TWO (2) differences between Daphnia and Moina?
Moina small size; Daphnia contained 70% more protein.
Name the organism.
Daphnia
Discuss the reproduction mode for rotifer.
Asexual - good environment condition; sexual - harsh environment.
Give THREE (3) reasons for the success of rotifer culture.
Tolerate wide range of environmental condition, small size, slow swimming velocity, can rear at high density, reproduce rapidly.
Give THREE (3) examples of microscopic animal.
Rotifer, artemia, copepod, dahpnia, moina.
Give THREE (3) disadvantages of live feed.
Unreliable quality and quantity from wild, labour cost, specialist skills, cultured continuously.
Give the scientific name for this organism.
Brachionus plicatilis
Give THREE (3) nutrients that are contained in live food organisms.
essential proteins, lipids, carbohydrates, vitamins, minerals, amino acids and fatty acids