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This study aims to evaluate the effect of different initial densities of Nile tilapia fingerlings on water quality, fish growth, and production of marjoram ( Origanum majorana L.) and sweet basil ( Ocimum basilicum L.) in a recirculating aquaponic set up. The experiment was carried out on randomized block design and comprised four fish densities (0, 150, 250 and 500 fish m -3 ) and two crops, in which each treatment was continued for 45 days and replicated three times. Except for pH and total alkalinity, all water physicochemical parameters were increased significantly at high fish densities. In contrast, most of the biological parameters for fish were unaffected by culture density, although at the highest density crude protein percentage was significantly increased and ether extract percentage was significantly reduced. Plant productivities were highest when fish were cultured at density of 500 fish m -3 , a density that was found to be appropriate for maintaining water quality and promoting fish growth while preventing toxicity and mortality. The present study has demonstrated the technical viability of coupling Nile tilapia culture coup with aquaponic production of marjoram and sweet basil.

acta scientiarum. technology/acta scientiarum. technology

&lt;b&gt;Integration of Nile tilapia (&lt;i&gt;Oreochromis niloticus &lt;/i&gt; L.) production &lt;i&gt;Origanum majorana&lt;/i&gt; L. and &lt;i&gt;Ocimum basilicum &lt;/i&gt; L. using aquaponics technology