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Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology
Published by Universitas Diponegoro
ISSN : 18584748     EISSN : 25490885     DOI : -
Core Subject : Education,
Education
SAINTEK PERIKANAN (p-ISSN: 1858-4748 dan e-ISSN: 2549-0885) adalah jurnal ilmiah perikanan yang diterbitkan oleh Jurusan Perikanan Fakultas Perikanan dan Ilmu Kelautan Universitas Diponegoro. Jurnal ini diterbitkan 2 (dua) kali setahun (Februari dan Agustus).
Arjuna Subject : -
Articles 502 Documents
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SEASONAL VARIATIONS IN THE REPRODUCTION OF TWOSPOT CATFISH (Mystus nigriceps) FIN THE CICINGGULING RIVER, KEBUMEN, CENTRAL JAVA Siti Rukayah; Agus Nuryanto; W Lestari; Isdy Sulistyo
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 22, No 2 (2026): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.22.2.102-108

Abstract

The Cicingguling River in Kebumen Regency is a freshwater ecosystem that serves as a critical habitat for native fish species, including Mystus nigriceps, which holds high ecological and economic value. This study aims to examine the reproductive characteristics of M. nigriceps over a full annual cycle (November 2022 - October 2023) using a survey method with purposive sampling. Field and laboratory sampling were conducted monthly to evaluate sex ratio, gonadal maturity stage (GMS), gonadosomatic index (GSI), fecundity, and egg diameter. The results showed an unbalanced sex ratio, with the number of female fish far exceeding that of males throughout the year. The GMS III and IV were higher during the rainy season, with GMS III at 295 individuals (female) and 170 individuals (male), and GMS IV at 259 individuals (female) and 144 individuals (male). The GSI and fecundity increased from December to February, coinciding with increased rainfall. The highest GSI and fecundity were recorded in January at 12.98% (females) and 6.63% (males), with fecundity reaching 17,927 eggs, accompanied by high rainfall (403 mm). Egg diameter during the rainy season showed a single peak (0.41–0.50 mm). In conclusion, M. nigriceps exhibits a seasonal reproductive pattern, indicating that the development of aquaculture and population dynamics depend on season-based management strategies. These findings provide a biological basis for data-driven conservation and support the sustainable management of freshwater fish resources in Central Java.
THE HATCHING OF JAVA COMBTAIL (Belontia hasselti) EGGS IN MEDIA WITH DIFFERENT pH LEVELS Danang Yonarta; Ayu Maslamia; Mochamad Syaifudin; Madyasta Anggana Rarassari
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 22, No 2 (2026): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.22.2.133-138

Abstract

The production of java combtail fry still relies heavily on wild catches, necessitating the development of semi-natural breeding techniques. One important factor influencing hatching success is the medium's pH. The pH value influences the activity of the enzyme chorionase, which softens the chorion, making the eggshell softer and facilitating hatching. This study aims to determine the optimal pH for the Java combtail hatching medium. The research method employed a completely randomized design (CRD) with 5 treatments and 3 replicates. The pH treatments for hatching were: medium pH 4±0.3 (P1), pH 5±0.3 (P2), pH 6±0.3 (P3), pH 7±0.3 (P4), and pH 8±0.3 (P5). The results showed that different pH levels in the hatching medium significantly affected hatching percentage, hatching duration, fry survival, fry length growth, and absolute fry weight. However, they had no significant effect on the percentage of larval abnormalities. P4 was the best treatment, yielding the highest hatching percentage of 90.00±0.82%, a hatching duration of 27.33±0.14 hours, and a larval survival rate of 96.19±2.43%, no larval abnormalities, absolute length growth of 4.94±0.05 mm, and absolute weight growth of 0.042±0.0010 g. This is likely because a pH of 7 (P4) represents the optimal condition supporting chorionase enzyme activity, thereby accelerating chorion softening and enhancing hatching success. Water quality during the study remained within the tolerance range for hatching and rearing of mudskipper fry. The research results serve as a reference for mudskipper fish farmers.

Page 51 of 51 | Total Record : 502

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