Abstract
The availability of copepodOithona similisas live food organism for shrimp and marine fish larvae is strongly influenced by the optimum feed and environment conditions. Optimization of dissolved oxygen (DO) forO. similiscan be carried out by providing proper aeration in culture media. Feeding with fermented organic diet besides phytoplankton is expected to support the individual growth, metabolism, and reproduction ofO. similis.The aim of this study was to examine the effect of different aeration flow rates on the growth performance and egg production ofO. similisand to determine the optimum aeration flow rate. Completely Randomized Design Experiment used in this study with 4 treatments and 4 replications. The treatment wasO. similisculture with different aeration flow rate of 0.00; 22.00; 45.67; 66.67 mL.second-1. The results showed that the difference aeration flow rate significantly affected (p <0.05) the growth performance and egg production ofO. similis. The aeration flow rate of 45.67 mL.second-1provided the best growth performance with total density of 81.25 ± 2.99 ind.mL-1; population specific growth rate 0.220 ± 0.002 day-1; and egg production28.40 ± 0.48 eggs.ind-1. Moreover, the optimum aeration flow rate culture medium forO. similisis 45.70 mL.second-1.
Highlights
Oithona sp. isolated from Indonesian coastal waters have been identified and classified as Oithona similis, which grow optimally at salinity of 19.4 ppt [3]
The availability of copepods including O. similis as larval feed is affected by media quality and optimum environment condition [1]
In O. similis culture, dissolved oxygen (DO) is one of environmental factors which has a role in metabolism processes
Summary
Oithona sp. isolated from Indonesian coastal waters have been identified and classified as Oithona similis, which grow optimally at salinity of 19.4 ppt [3]. Isolated from Indonesian coastal waters have been identified and classified as Oithona similis, which grow optimally at salinity of 19.4 ppt [3]. The availability of copepods including O. similis as larval feed is affected by media quality and optimum environment condition [1]. Environmental factors, i.e. temperature and dissolved oxygen (DO) are essential for the production of nauplii copepods, individual growth rate, and metabolism [5]. In O. similis culture, DO is one of environmental factors which has a role in metabolism processes. Optimization of DO for O. similis can be carried out by providing some amount of aeration flow rate into the culture media. Research about the effect of aeration flow rate in the culture media is very important to determine its optimum point for supporting O. similis growth at high density
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