Effects of different feeds for the survival potential on early larval stage of white blotch snapper, Lutjanus rivulatus

Ching , Fui Fui (2007) Effects of different feeds for the survival potential on early larval stage of white blotch snapper, Lutjanus rivulatus. Masters thesis, Universiti Malaysia Sabah.

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Abstract

The high mortality in the early larval stage of Hoi Tai Kai, Lutjanus rivulatus had caused to the failure in seed production. Three factors were responsible for the mass mortality: Small body size at hatching (2.19 mm), small mouth size at first feeding (80 pm) and short nutrition transition period (18 hours). The difficulty of larvae to consume rotifer, Branchionus sp. had restricted the success first feeding. The available rotifer (150-230 pm) is considered too large for the small mouth size larvae to consume. Five artificial feeds and two live feeds were tested as starter feed in this study: boiled egg yolk (BE), cod oil juice (COJ), raw egg yolk (RE) and combination feeds of BE and CO] (BE+COJ), combination feeds of BE and RE (BE+RE), rotifer and natural plankton. The effect of these different feeds to the survival potential of larvae was indicated. Finding shows larvae were only able to consume artificial feed based on the gut content observation. BE was found able to contribute the highest survival rate (87.7±3.3) and larvae succeed to survive in 9 dAH. The factors cause BE to become the most effective starter feed for larvae. Several factors responsible for the success use of BE: consumable by larvae, offer wide range of size (10-180 pm), highly preferred to be consume, Chesson index a (0.99), short gut passage time at the fist feeding day (30 minutes), resembles an attractive feed for the visual feeder larvae to detect feed in the rearing water as well as able to being nutritious feed for larvae.

Item Type:Thesis (Masters)
Uncontrolled Keywords:Lutjanus rivulatus, first feeding, survival potential, selectivity of feed size, selectivity of feed type.
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions:SCHOOL > Borneo Marine Research Institute
ID Code:6797
Deposited By:IR Admin
Deposited On:21 Aug 2013 15:12
Last Modified:21 Aug 2013 15:12

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