EVALUATION OF MICROBIAL FLOC AND MICROALGAE Spirulina platensis COMBINATION FOR JUVENILE COBIA Rachycentron canadum DIETS ON GROWTH AND PHYSIOLOGICAL RESPONSES AFTER IMMERSION IN FRESHWATER

Suryadi Saputra, Muhammad Agus Suprayudi, Enang Harris, Mia Setiawati, . Widanarni, Suci antoro
https://doi.org/10.29244/jitkt.v8i1.13084

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Issue
Vol. 8 No. 1 (2016): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Accepted
31 August 2016
Published
11 November 2016
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Abstract

In marine aquaculture, immersing marine fish species in fresh water can remove ectoparasite that adhere to all over the fish body. This study aimed to evaluate the impacts of combining microbial floc and microalgae Spirulina platensis in juvenile cobia diet on growth performance and stress responses after immersion in aerated fresh water for 15 minutes. The fishes were reared in concrete tanks for 40 days before collecting data on their growth performance. The stress response was determined by mea-suring both glucose and cortisol levels before (0 h) and after (1, 2, 4, 6, 24 hours) immersion. The fish-es fed on the 15% of combining microbial flock and microalgae Spirulina platensis diet showed the highest growth rate with the lowest feed conversion ratio compared to other treatments. The cortisol level of juvenile cobia in both the 15% and 30% combination of microbial floc and microalgae Spiru-lina platensis treatments did not increase during the first hour following the immersion compared to the control treatment. The glucose level also increased after one hour immersion in freshwater of all treatments. This indicated that feeding juvenile cobia on microbial flocs and microalgae diets had a retarding effect on the physiological responses (cortisol and glucose) after immersion in fresh water.

Keywords: microbial, microalga, Spirulina, glucose, cortisol, stress, cobia

Authors

Suryadi Saputra
Main Center for Marine Aquaculture, Minister of Marine and Fisheries Affairs, Lampung
sy.saputra1973@gmail.com (Primary Contact)
Muhammad Agus Suprayudi
Aquaculture Department, Faculty of Fisheries and Marine Sciences, Bogor Aqricultural University, Bogor.
Enang Harris
Aquaculture Department, Faculty of Fisheries and Marine Sciences, Bogor Aqricultural University, Bogor.
Mia Setiawati
Aquaculture Department, Faculty of Fisheries and Marine Sciences, Bogor Aqricultural University, Bogor.
. Widanarni
Aquaculture Department, Faculty of Fisheries and Marine Sciences, Bogor Aqricultural University, Bogor.
Suci antoro
Aquaculture Department, Faculty of Fisheries and Marine Sciences, Bogor Aqricultural University, Bogor
SaputraS., SuprayudiM. A., HarrisE., SetiawatiM., Widanarni., & antoroS. (2016). EVALUATION OF MICROBIAL FLOC AND MICROALGAE Spirulina platensis COMBINATION FOR JUVENILE COBIA Rachycentron canadum DIETS ON GROWTH AND PHYSIOLOGICAL RESPONSES AFTER IMMERSION IN FRESHWATER. Jurnal Ilmu Dan Teknologi Kelautan Tropis, 8(1), 227-235. https://doi.org/10.29244/jitkt.v8i1.13084
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