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1. Reproductive Cycle, Size at Maturity and Fecundity of Giuris margaritaceus in Limboto Lake.

Author

Lamadi, Arafik, Iranawati, Feni, Widodo, Maheno Sri, and Wiadnya, Dewa Gede Raka

Subjects
*MENSTRUAL cycle, *MARINE ecology, *FISHERIES, *FISHERS
Abstract

Understanding fish reproduction biology, particularly sexual maturity, the reproductive cycle, and fecundity, is useful for managing fisheries. The reproduction of Giuris margaritaceus in Limboto Lake is regrettably unknown. Over a year, fish specimens (N = 662) were gathered. They ranged in length from 6.5 to 20.9 cm (mean SD 10.9±2.5). Fecundity varied from 30,057 to 61,920. The first sexual maturity of male and female fish occurred at different sizes, 11.2 cm and 10.3 cm, respectively. This information is needed to determine this fish's lowest acceptable harvest length under the management aim to enter all-female fish for reproduction at least once. We estimated the reproductive of G. margaritaceus cycle using the size of the oocytes, histological analysis of the ovaries, and monthly mean GSI. These techniques produced the same reliable conclusion: G. margaritaceus can spawn yearly, with maximal between September and October. Based on this finding, spawners of G. margaritaceus can be kept from entering the reproductive stock between September and October. Future efforts to fine-tune fishing efforts for the effective management of G. margaritaceus may be aided by the study's findings. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Sexual Dimorphism of Ambigous Hulu'u Fish (Giuris sp. Limboto) from Limboto Lake, North Sulawesi.

Author

Lamadi, Arafik, Paricahya, Akhsan Fikrillah, Iranawati, Feni, Widodo, Maheno Sri, and Raka Wiadnya, Dewa Gede

Subjects
*SEXUAL dimorphism, *PRINCIPAL components analysis, *SEXUAL selection, *FEMALES
Abstract

Intraspecific sexual dimorphism between males and females is tied to sexual selection, such as body features and color patterns. Sexual selection pressure in the genus Giuris may occur in either or both sexes. The present study aimed to analyze the sexual dimorphism of Hulu'u fish (Giuris sp. Limboto) from Limboto Lake, Gorontalo Province, North Sulawesi. 272 individuals of Giuris sp. from Lake Limboto, were used with a male to female ratio of 1:1. The mean total length (TL) of male and female fish was 11.5± 2.1 and 12.2± 2.8cm, respectively. A total of 17 morphometric characters were analyzed using the morphometric truss method (dividing using TL) and analyzed by Z-test. Characters with significant differences between males and females were then analyzed using principal component analysis (PCA). The study found that male fish have longer fin sizes than females, including the length of the first dorsal, pectoral, pelvic, anal and caudal fin. In addition, male fish have longer heads than female fish. PCA analysis of the first principal component (C1) consisted of several characteristics: the length of the first dorsal, pectoral, and caudal fin length. The characteristics of head length, pelvic fin length, and anal fin length are associated with the second principal component (C2). The first and second main components could explain 78.3% of the data diversity. Furthermore, the male individuals had a conical genital papillae shape, contrasting with female individuals with bulbous genital papillae shape. In conclusion, males and females of Giuris sp. from Lake Limboto can be distinguished by their fins, heads, and papillae. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Peningkatan Daya Tetas Telur Dan Kelangsungan Hidup Ikan Komet (Carassius auratus) dengan Menggunakan Thyrax.

Author

adam, Angki, Syamsuddin, and Lamadi, Arafik

Abstract

Copyright of Journal of Aquaculture Science is the property of Universitas Airlangga and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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20. Padat Tebar Yang Berbeda Terhadap Kelangsungan Hidup Benih Ikan Mas (Cyprinus carpio L) Menggunakan Resirculation Aquaculture System (RAS)

Author

Lamadi, Arafik, Marapua, Reynaldo P. A, and Mulis, Mulis

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh padat tebar yang berbeda dengan menggunakan Resirculation Aquaculture System (RAS) terhadap kelangsungan hidup benih ikan mas. Penelitian ini dilaksanakan di Balai Perikanan Budidaya Air Tawar (BPBAT) Tatelu, Kecamatan Dimembe, Kabupaten Minahasa Utara, Provinsi Sulawesi Utara. Penelitian ini menggunakan metode eksperimen dengan Rancangan Acak Lengkap (RAL) yang terdiri dari 4 perlakuan dan 3 ulangan. Pengujian dilakukan dengan cara menebar benih ikan mas pada wadah budidaya dengan teknologi RAS dengan kepadatan yang berbeda. Perlakuan A (Kontrol), perlakuan B (10.000 ekor/m3), perlakuan C (15.000 ekor/m3) dan perlakuan D (20.000 ekor/m3). Hasil tingkat kelangsungan hidup benih ikan mas menunjukkan perlakuan A lebih baik dari perlakuan lainnya (56,02%) dan Perlakuan D menunjukkan nilai lebih buruk dari perlakuan lainnya (43,16%). Penelitian ini menggunakan Analisys of Varience (ANOVA) sehingga menunjukan padat tebar berbeda dengan menggunakan RAS memberikan pengaruh nyata. Parameter kualitas air selama penelitian menunjukkan nilai amonia (NH3) tinggi dikarenakan ketidaksiapan bakteri pada biofilter. Disarankan untuk mengembangkan bakteri (Nitrosomonas dan Nitrobacter) selama 45 hari.Kata Kunci : Ikan Mas, Padat Tebar, Resirculation Aquaculture System, Kelangsungan Hidup.

Published
2020
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21. Pengaruh Larutan Daun Teh terhadap Daya Tetas dan Kelangsungan Hidup Larva Ikan Mas | Effect of tea leaf solution on hatchability and survival of goldfish larvae

Author

Imran, Inka, Muharam, Ade, and Lamadi, Arafik

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan larutan daun teh dengan dosis yang berbeda terhadap daya tetas dan kelangsungan hidup larva umur 14 hari pada ikan mas (Cyprinus carpio). Desain penelitian yang digunakan adalah eksperimen dengan menggunakan rancangan acak lengkap (RAL) empat perlakuan dengan satu perlakuan kontrol dan tiga kali ulangan. Hasil penelitian menujukan bahwa nilai daya tetas telur ikan mas perlakuan A = 3g/l yaitu 77,66%, perlakuan B = 5g/l yaitu 74%, perlakuan C = 7g/l yaitu 85,33% dan perlakuan D = kontrol 61%. Sedangkan kelulusan hidup larva ikan mas, perlakuan A= 3g/l yaitu 85.27%, Perlakuan B = 5g/l yaitu 89,64%, perlakuan C = 7g/l yaitu 91,12% dan perlakuan D = kontrol 98,35. Hasil analisis sidik ragam (ANOVA) menunjukan bahwa perlkuan perendaman larutan daun teh dengan dosis yang berbeda terhadap daya tetas dan kelangsungan hidup ikan mas memberiakan pengaruh sangat nyata terhadap setiap perlakuan. Parameter kualitas air selama penelitian masih dalam kondisi normal untuk penetasan dan kelangsungan hidup larva ikan mas. This study aims to determine the effect of the use of tea leaf solution with different doses on hatchability and survival of 14-day-old larvae in carp (Cyprinus carpio). The research design used was an experiment using a completely randomized design (CRD) of four treatments with one control treatment and three replications. The results showed that the value of hatching goldfish treatment A = 3g / l is 77.66%, treatment B = 5g / l is 74%, treatment C = 7g / l is 85.33% and treatment D = control 61% . While the survival rate of carp larvae, treatment A = 3g / l was 85.27%, treatment B = 5g / l was 89.64%, treatment C = 7g / l was 91.12% and treatment D = control 98.35. The results of analysis of variance (ANOVA) showed that the need for soaking of tea leaf solution with different doses of hatchability and survival of carp gave a very significant effect on each treatment. Water quality parameters during the study were still in normal conditions for hatching and survival of carp larvae. Katakunci: Ikan mas; telur; larva; daun teh; daya tetas; kelangsungan hidup. Keywords: Carp; egg; larvae; tea leaves; hatchability; life sustainability.

Published
2020

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