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Global Summit on
October 26-27, 2018 | Boston, USA
Agriculture, Food Science and Technology
Advances in Crop Science and Technology | ISSN: 2329-8863 | Volume: 6
Influence of some natural factors on the survival, growth performance and production of European sea
bass fish (
Dicentrarchus labrax
) larvae and juveniles
Heba S El-Sayed, Khouloud M Barakat, Nagy El-Bermawi, Mohamed A Essa
and
Khaled A Fadel
National Institute of Oceanography and Fisheries, Egypt
A
ddition of different microalgae as green water,
Nannochloropsis salina, Isochrysis galbana, Tetraselmis chuii, Chlorella salina
and a mix of them, to enrich the rearing water during the larval to post-larval stages of sea bass (
Dicentrarchus labrax
) was
evaluated in terms of growth, survival and metabolic chemical composition. The present study was carried in Marine Hatchery
of NIOF, Alexandria, where first it starts from the third day after hatch till the 45
th
day of aged post-larvae. The results revealed
that the user of the
Isochrysis galbana
promoted growth performance by increasing weight gain (WG) to 12.75mg/fish compared
with control 10.18mg/fish and also achieved survival percentage 46.08%, which was 20.09% in control group. Moreover,
I. galbana
and mixed algae showed the highest values for protein, lipid and dry matter contents at significance level P<0.05 compared to the
control treatment. Microbiological analysis showed highest total bacterial count in the water containing
I. galbana
, considering
this microalga may benefit larvae by producing probiotic as bacterial associated communities that promising green water effect for
enhancing the appropriate larval environment, growth and survival of the
D. labrax
larvae during the early larval stage. Secondly, this
present study also dealt with weaning period in post larval stages to Juveniles by applying five different treatments of food additives
in the diets formulations composed of natural Seafood sources compared to artificial food. (DZ) Zoo control dry feed 45% protein,
(DS) dry feed 30% protein, (FF) equal mixture proportions of fresh sardines and squid and crab eggs and decapsulated artemia cysts,
(D+A): 80% dry feed (Skretting) dry feed addition to 5% Fish oil (weight of dry feed Hendrix) and 20% decapsulated artemia cysts
by on a dry weight basis and (D+C): 80% dry feed (Skretting) dry feed addition to 5% fish oil (from weight Hendrix) +20% Minced
crab hydrated by on a dry weight basis. The result revealed a significant difference (P<0.05) in FW and WG between the control basal
diet and the other experimental diets. The FW and WG showed the highest value recorded for FF (37.34±0.183 and 33.90±0.18g/fish
respectively as well as highest survival percentage (100%) while the lowest performance was obtained for (DS) treatment with values
9.00±0.317 and 5.58±0.30 g respectively & 90.00±5.774) % for survival which increased gradually in DZ (control) to 96.67±3.333%.
hebasaad2222@yahoo.comAdv Crop Sci Tech 2018, Volume 6
DOI: 10.4172/2329-8863-C2-009