Publication Date:
2021-05-19
Description:
Fish meal production has been fixed in the world because of a limitation in fish stocks. On the other hand,
demand of fish meal is growing daily and consequent the cost, too. Therefor, attention to the other protein
sources is nessesary. Some plant protein sources, especially oilseeds, have valuable potentials for replacing fish
meal because of relative high production in the world and Iran and low cost. According to existing information
and availability, cottonseed meal and canola meal were selected as oilseeds; and Azolla was considered whether
to be controlled in north provinces of Iran as weed.
Growth indices (WG and SGR), food (FCR) and protein efficiency (PER and PCE) of fingerling Nile tilapia
Oreochromis niloticus were evaluated in 3 synchronous examinations with 12 treatments and 36 replications.
Groups of control, canola meal (at rates of 25, 50, 75 and 100%), cottonseed meal (at rates of 15, 25, 35 and
45%), as the replacements of expensive protein sources (fish meal and soybean meal), and azolla (at rates of 13,
21 and 29% of diet) were studied. Growth indices, total food intake and protein intake of control group were
higher than all diets contained plant protein sources. They decreased with plant protein increasing in every grous,
separagely (p〈0.05). FCR and protein efficiency indices didn’t show any significant differences (p〉0.05)
between control and canola meal (at rates of 25 and 50%), cottonseed meal (at rates of 15, 25 and 35%) and
azolla (at rates of 13 and 21%). All plant protein ingredients were unpalatable, and consequent total food intake,
protein consumption and growth decreased. It will be expected that Canola meal and cottonseed meal replace
expensive protein sources at the rates of 50 and 35% respectively, and azolla use at the rate of 21% in diets If the
problem in palatability solves.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Diet
;
Black tilapia
;
Replacement
;
Low-cost and native materials
;
Oreochromis niloticus
;
Material
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
57pp.
