Reproductive performance of crossbreeding between local female and imported male koi at CV. Indokoi Malang

¹ Aquaculture Department, Faculty of Agriculture and Animal Science, University of Muhammadiyah Malang, 65144 East Java, Indonesia
² CV. Indokoi Malang, Pakisaji, Malang District, Indonesia

^* Corresponding author: ganjar@umm.ac.id

Abstract

The high demand for koi fish must be supported by an adequate supply of fry, both in quantity and quality. High-quality fry comes from superior broodstock. This study aimed to evaluate the quantity, type, and quality of fry produced by crossbreeding local and imported broodstock. A descriptive quantitative method was used, with natural spawning at a ratio of 1:3 (female), involving Shiro F1, local Shiro, local Showa, and imported Ginrin Shiro. Results showed a fecundity of 103,800 eggs, with fertilization, hatching, and survival rates of 84%, 93%, and 74.7%, respectively. The first selection yielded 79% high-quality fry, while the second selection produced 10% high-quality fry. Showa fry dominated the second selection, comprising 84% of that batch and 9.2% of the total fry, while Shiro fry made up 16% of the second selection and 1.7% of the overall fry. The highest daily growth rate occurred in the first week (4.6%/day), while the lowest was in the second week (2.08%/day). The highest specific growth rate was also in the first week (36.43%/day), with the lowest in the fourth week (5.61%/day). Water quality remained suitable for koi fry survival throughout the study.