Impact of mono or polyculture systems on water quality, growth performance and economic efficiency of Oreochromis niloticus (Linnaeus, 1758) and Hypophthalmichthys molitrix (Valenciennes, 1844)

This trial aimed to evaluate effects of stocking densities of 1-5 fish/m2 on growth performance, survival rate and economic efficiency of Asian seabass (Lates calcarifer) in earthen ponds. Fish with an initial length of 90.7 ± 0.1 mm and weight of 20.8 ± 0.1 g/fish and ponds with 600 m2 each and 1.5 m depth were used for this study. Experiment was designed with three treatments, including different stocking densities of 1, 3 and 5 fish/m2. The fish was fed with pellete feed containing 43 - 44% crude protein. Water quality parameters including temperature, dissolved oxygen, pH, salinity, transparency and ammonia concentration were measured once a week. Fish were sampled every 30-day intervals for length and weight measurement then for their growth estimation. Costs were recorded for economic efficiency estimation. Results showed that the water quality parameters were in suitable ranges for growth and development of Asian seabass. The final average length and weight of density 1 fish/m2 was significantly higher than those at 3 and 5 fish/m2 (P < 0.05). However, there was no significant difference on the fish growth in terms of daily length and weight gain, as well as survival rate and feed conversion ratio between different stocking densities. Asian seabass culture at 3 and 5 fish/m2 resulted in a higher profit compared to at 1 fish/m2. The highest economic efficiency in terms of area pond was showed at 5 fish/m2 treatment.

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Effect of fertilization sources with artificial feeding on growth performance, water quality and returns of monosex Nile tilapia (Oreochromis niloticus) reared in earthen ponds

Egyptian Journal of Aquatic Biology and Fisheries ◽

10.21608/ejabf.2013.2170 ◽

2013 ◽

Vol 17 (2) ◽

pp. 91-104

Author(s):

Abdel-Wahab Abdel-Warith

Keyword(s):

Water Quality ◽

Growth Performance ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Artificial Feeding ◽

Nile Tilapia Oreochromis Niloticus ◽

Earthen Ponds

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Evaluation of use effective microorganisms (EM) with different feeding strategies on growth performance, body chemical composition and economic efficiency of monosex Nile tilapia Oreochromis niloticus juveniles

Aquatic Living Resources ◽

10.1051/alr/2021021 ◽

2021 ◽

Vol 34 ◽

pp. 21

Author(s):

Mohamed F. Abdel-Aziz ◽

Yaseen A. Abdel-Tawwab ◽

Mohamed F. Sadek ◽

Abdel Moneim M. Yones

Keyword(s):

Chemical Composition ◽

Growth Performance ◽

Economic Efficiency ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Basal Diet ◽

Feed Utilization ◽

Fish Growth ◽

Feeding Strategies ◽

Effective Microorganisms

A factorial trial was conducted to detect the effect of different feeding strategies of supplementation of effective microorganisms (EM) liquid on the growth performance, feed utilization, body chemical composition and economic efficiency of monosex Nile tilapia (Oreochromis niloticus) juveniles. Three experimental treatments were formulated a basal diet without any addition of EM (control; A), a diet supplemented with 2% EM (B), and a diet supplemented with 4% EM (C). All treatments were offered to fish through two different strategies of feeding the meal: 2/3 in the morning and 1/3 in the afternoon or 1/3 in the morning and 2/3 in the afternoon. Each treatment was replicated three times. Juveniles Nile tilapia with an average initial body weight of 3.85 ± 0.22 g (± SE) were randomly stocked at a rate of 90 juveniles per 1.5 m3 tank. Fish growth performance and feed utilization significantly (P ≤ 0.05) increased with increasing EM supplementation and were positively affected by different feeding strategies. Moreover, the economic evaluation showed that there were more benefits by when using the 4% EM diet and feeding 2/3 of daily meal in the morning.

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