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All Journal Jurnal Pertanian Terpadu Santo Thomas Aquinas
Sitaniapessy, Jolanda
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Veterinary

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Pengaruh lama Perendaman Hormon Methyltestosteron terhadap Maskulinisasi ikan Nila (Oreochromis niloticus) Ngantu, Robertus; Sitaniapessy, Jolanda
Jurnal Pertanian Terpadu Santo Thomas Aquinas Vol. 2 No. 1 (2023): Jurnal Pertanian Terpadu Santo Thomas Aquinas
Publisher : STIPER Santo Thomas Aquinas Jayapura

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Abstract

Masculinization is an attempt to increase the number of male fish or direct fish to become male. This is because reproduction energy is diverted to somatic growth. Monosex production of males using the hormone metyltestosterone is reported to be most effective using the larval immersion method during the sex differentation or critical period, in which the larval brain is still a biopotential state directing the formation of sexes in morphology, behaviour and function. Immersion is one of the methods used for male sex change apart from oral (feeding) and injection. Soaking the tilapia larval stage at the age of 10 and 14 days with 1,800 ug/LMT for 4 and 8 hours produced 91,6% and 98,3% of males. The study aimed to determine how long soaking of the larvae in the hormone methyltestosterone on the good masculinization of tilapia (Oreocrhomis niloticus) and what percentage of masculinization is in the larvae of tilapia (Oreocrhomis niloticus) using the hormone methyltestosterone through immersion.The result of ANOVA calculation show that the difference in the duration of immersion with the hormone methyltestosterone sygnificantly affect the percentage of the number of male fish produced.
ESTIMASI PENUTUPAN LAMUN DI PERAIRAN PANTAI BASE-G KOTA JAYAPURA Sitaniapessy, Jolanda
Jurnal Pertanian Terpadu Santo Thomas Aquinas Vol. 2 No. 2 (2023): Jurnal Pertanian Terpadu Santo Thomas Aquinas
Publisher : STIPER Santo Thomas Aquinas Jayapura

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The aim of this research is to determine the types of seagrass and seagrass cover. The research results obtained were that several types of seagrass were found based on the identification results, namely Cymodocea rotundata, Halophilia ovalis, Halodule pinifolia, Enhalus acroides and Syringodium isoeatifolium. Based on the results of calculating the highest percentage of seagrass cover. is from the Cymodoceae rotundata type, namely 26.31% on transect V, while the lowest is from the Syringodium isoetifolium type on transect 7, namely 1.78%. It can be said that Base G beach has a low percentage of seagrass cover. where each transect has a very low estimated value. It is estimated that this is because Base G beach is a tourist area where every day many visitors carry out activities on the beach and community activities around the area, thus disturbing the surrounding ecosystem. Based on the results of calculations of seagrass cover at Base G Beach, the condition of seagrass for all types in the area is poor because the estimated value is below 29.9%. Meanwhile, based on the scale of seagrass conditions at Base G beach, it shows that the presence of seagrass in the area is on a scale of 3, 2 and 1. For the Cymodeceae rotundata type it is in the range of 25 - 50%, categorized as rather good condition on a scale of 3, while the other 3 types are Halodule ovalis, Halodule pinifolia and Enhalus acroides fall into the range of 5 – 25%. On a scale of 2 with few conditions, while the Syringodium isoetifolium type is in the < 5% range in very few conditions.
Co-Authors Ngantu, Robertus