Survival rate and growth rate of milkfish (Chanos chanos, Forsskal 1775 ) seeds in the acclimatization process at Ir. H. Djuanda Reservoir

Abstract

Milkfish is one of the important economical fish species that usually lives and cultivated in estuarine areas. However, milkfish can adapt to habitat with salinity ranging from 0 - 40 ppt. Therefore, milkfish is a potential choice of introduced fish in freshwaters. This study aims to determine the survival rate and growth rate of milkfish seed in the waters of Ir. H. Djuanda Reservoir. H. Djuanda. The study was conducted experimentally in November – December 2017, every week for five weeks in floating net cages with a size of 7 x 3 m and depth 0.75 m at Ir. H. Djuanda Reservoir with three treatments of densities that are 4,000; 6,000 and 10,000 seeds. The size of milkfish seeds used was 3-5 cm because it was able to adapt in freshwaters. The milkfish was cultivated by the extensive system without a commercial feed so they only use natural food. The results showed that the number of dead milkfish increased with increasing density and the highest mortality occurred on the day 7th in 10,000 density treatment. The milkfish seed mortality began to decrease on the day 9th of the trial and the deaths did not occur again on the day 19th-21st. The highest survival rate was 79.21% for 6,000 densities. The highest length growth rate was 0.93 mm/day for 6,000 densities. The smallest estimated investment was 10,000 densities, but it has the largest losses due to seed death. Because the condition was dense, there was competition for food, oxygen, and space. Therefore, seed acclimation is carried out in stages.

The Assessment of Water Compatibility of Adaptable Stick-Net Cage for Resilience Milkfish Cultivation in Tanjung Mas, Indonesia

“…The water temperature of the KJT location in Tanjung Mas ranges between 31ºC -37ºC. This temperature is not suitable for milkfish cultivation because the optimal temperature for milkfish growth goes from 27ºC -30ºC (Astuti & Warsa, 2020). The high temperature in the KJT areas may be influenced by the long dry season that increases the water surface temperature due to the high intensity of sunlight.…”

Analisis Efisiensi Faktor Produksi Pada Usaha Budidaya Ikan Bandeng Di Kecamatan Seruway Kabupaten Aceh Tamiang

“…Ikan bandeng (Chanos chanos), merupakan ikan yang memiliki tubuh tergolong ramping dan agak pipih, lengkap dengan sirip punggung dan ekor yang kuat. Ikan ini memiliki sirip ekor terbagi menjadi dua bagian, membantu ikan ini berenang dengan cepat (Astuti & Warsa, 2020). Ikan bandeng banyak ditemukan di wilayah perairan tropis dan subtropis, termasuk Indonesia, Filipina, Thailand, Taiwan, dan Australia Utara (Djumanto et al, 2017).…”

The productivity phenomenon of tilapia floating net cages in Jatiluhur Reservoir in line with the Citarum Harum program

“…This temperature range is still good for fish cultivation in net cages because it is still in the range of 23-28 °C [19]. Water temperature in Jatiluhur Reservoir in November-December 2017 ranged from 29.0-30.8°C [20]. Temperatures in the Jatiluhur Reservoir in February-August 2018 ranged from 26.0-28.3 °C [21].…”

“…Decomposed organic matter will cause a decrease in dissolved oxygen concentration [24]. Research in November-December 2017 stated that dissolved oxygen concentrations ranged from 2.14-4.29 mg/L [20]. In 2014, the dissolved oxygen concentration showed a value that was still quite high, above 6 mg/L, but in 2015 and 2016 there was a decrease in dissolved oxygen concentration and continued until 2018 [7].…”

“…Meanwhile, the water temperature ranges from 26.0-32.0 °C which is included in the relatively optimal category for fish growth. pH value in 2017 ranged from 6.7-7.4 [20], and in 2018 it ranged from 6.5-7.0 [21]. Most natural waters have pH values between 6.5-9.0, pH values below 4 and IOP Publishing doi:10.1088/1755-1315/1119/1/012060 8 above 10.5 can cause fish death, pH between 4.0-5.0 and 9.0-10.5 fish can not reproduce, and pH between 4.0-6.5 fish experienced in slow growth, and fish can grow well at a pH between 6.0-8.0.…”