The Celebes rainbowfish (Marosatherina ladigesi) is a species of sailfin silverside native to to Sulawesi in Indonesia. Unfortunately; reproductive capacity of this precious fish is declining and it is at the verge of extinction; reported by International Union for Conservation of Nature1. Therefore, M. ladigesi should be domesticated for preservation purpose.
The survival rate of larvae is still near to the ground at the early stage of their life and high cases of mortality were observed because of insufficient nutrition after absorption of the yolk-sac and the first feeding of larvae2. Moreover, this food does not communicate with the development of digestive organs and digestive enzyme activity3. The capability of this particular fish to devour food depends on the fully developed of the digestive organs and digestive enzymes4. In addition, digestive physiology also directly influences the development, survival and the growth of fish5. Accordingly, this information during the early stages of larval development; can be useful in the artificial feeding management6. Investigation regarding activities of digestive enzymes including protease, lipase and amylase during larval development of Celebes rainbow fish has not been done yet. For that reason, Jayadi , Amrah Husma and Ilmia conducted a research to investigate activities of digestive enzymes of M. ladigesi larvae during ontogeny by providing a mix of natural food such as Infusoria sp., Daphnia sp. and Artemia salina under controlled conditions for 35 DAH.
In this experiment, scientists collected the larvae from natural spawning and the mixed live feed: Infusoria sp., Daphnia sp. and Artemia salina were given twice a day. Feed intake, growth, survival, activities of protease, lipase and amylase enzymes were examined during 3, 5, 10, 15, 20, 25, 30, 35 Days after Hatching (DAH). Complete randomized trial design was followed to analyze the data.
Scientists noted that the activity of the enzymes accelerated at the age of 10-15 DAH larvae entering a phase of flexion. Therefore, Jayadi and colleague concluded that the application of mixed live feed Infusoria sp., Daphnia sp. and A. salina contribute to enzyme protease, lipase and amylase activities during the ontogeny stages of M. ladigesi. Moreover, the maximum activity of protease exhibits that the fish have carnivorous feeding habits. These findings can pave a way to improve the maintenance technique of M. ladigesi larvae to amplify growth and improve survival for accelerating the production of M. ladigesi.
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17 November, 2019