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Tingkat Kematangan Gonad dan Fekunditas Abalon (Haliotis squamata) Dewa Ayu Angga Pebriani; I Ketut Wija Negara
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This study aimed to find out the relationship between the maturity level of female abalone gonads with fecundity and egg diameter size of abalone. The results obtained showed that abalone having gonadal maturity level 1 was in the range of 3-4.5cm; gonadal maturity level 2 in the range size of 4.6-6 cm; and gonadal maturity level 3 in the size range> 6 cm. The results of the abalone gonad histology test showed that abalone with gonadal maturity level 1 had more ootid distribution than the primary oocyte. gonadal maturity level 2 has more ootid distribution, primary oocytes than secondary oocytes. Whereas in gonadal maturity level 3 it appears that secondary oocytes dominate which means the gonads are mature and ready to be spawned. The oocyte diameter is getting bigger and more similar simultaneously with an increasing level of gonad maturity. Abalone with gonadal maturity level 1 has an average oocyte diameter of 187 ?m gonadal maturity level 2 of 190 ?m, and gonadal maturity level 3 of 217 ?m.Abalone fecundity for gonadal maturity level 1 ranged from 60,480-86,190 oocytes; TKG 2 ranges from 196,560-214,520 oocyte grains; and TKG 3 ranges from 483,600-518,880 oocyte grains. Based on the results obtained, it can be concluded that the higher the level of maturity of the abalone gonad, the greater the fecundity with the distribution of more secondary oocytes seen in the results of the gonad abalone histology test.

Diversitas Perifiton Pada Daun Lamun Enhalus acoroides Di Perairan Karangsewu, Teluk Gilimanuk, Taman Nasional Bali Barat Arliza Cynthia Razali; Ni Luh Watiniasih; Ayu Putu Wiweka Krisna Dewi
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Seagrass is one of the important ecosystems, both physically and biologically. In addition, seagrasses also act as the main producers in food webs, become shelters, forage and breed various types of biota, one of which is periphyton. Periphyton is a collection of micro-organisms and plants (a collection of cyanobacteria and microinvertebrate algae) that live around the epiphyton in the waters. This study aims to determine the type composition and diversity of periphyton that attaches to seagrass leaves. The method used is the observation method. Data retrieval is done by the transect line method. Periphyton compositions obtained were as many as 23 types of periphyton consisting of 4 classes, namely Bacillariophyceae (16 species), Cyanophyceae (4 species), Euglenophyceae (1 species) and Chlorophyceae (2 species). The highest composition was found in the Bacillariophyceae class, which was 63% and the lowest composition was in the Chlorophyceae class of 1%. Periphyton diversity includes diversity index, uniformity index and dominance index. Where the value of the diversity index is classified as moderate, perifiton uniformity index value is high, and the perifiton dominance index value is relatively low.

Keanekaragaman Gastropoda Sebagai Bioindikator Kualitas Perairan di Pantai Bangklangan Kabupaten Karangasem Bali Dahlia Sandewi; Ni Luh Watiniasih; Dewa Ayu Angga Pebriani
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This research was done at Bangklangan Beach, Perasi Village, Karangasem Regency, Bali. The purpose of this study was to determine diversity of Gastropods as bioindicator of water quality in Bangklangan Beach. Gastropods sampling was done by using a line transect technique stretched along 75 meters parallel to the shoreline. The size of the quadrant used is 1m × 1m. Result of research found 48 species Gastropoda joined in 14 Family. The density number of the gastropods in Bangklangan Beach was 218.25 ind/m2. The diversity index of the gastropods ranged from 2.21 to 2.83, the evenness index ranged from 0.76 to 0.78, the dominance index ranged from 0.11-0.18. The value of water quality in Bangklangan Beach such as water temperature ranged from 29.8?C-30.6?C, pH waters ranged from 8.3-8.4, dissolved oxygen ??ranged from 5.4-5.6 mg /l, water salinity ranged from 29.1-30.3 mg/l, water turbidity ranged from 1.25-1.64 NTU, BOD5 ranged from 7.54-8.69 and TSS ??ranged from 0.80-0.95 mg/l. Based on the correlation of temperature with H' has a very weak positive correlation with a value of 0.149, dissolved oxygen with H' has a very weak positive correlation with a value of 0.177, acidity with H' has a very weak negative correlation value of -0.236, salinity with H' has a weak negative correlation with a value of -0.459, turbidity with H' has a weak positive correlation with a value of 0.332, BOD5 with H' has a very weak positive correlation value with a value of 0.147. TSS with H' has a very weak positive correlation value of 0.013.

Endoparasit Pada Ikan Kakap Merah (Lutjanus sp.) di Pantai Kelan, Bali; Potensi Bersifat Zoonosis Sri Hartini; I Made Damriyasa; Endang Wulandari Suryaningtyas
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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One of the factors that reduce fish production and population is disease. This study aims to determine the various types of zoonotic endoparasites, prevalence, intensity, abundance, diversity index, relationship of fish length-weight, relationship length with the intensity of parasites, and the relationship between weight and intensity of parasites. This research was conducted at Kelan Beach, Bali from December 2018 to April 2019. The research used a descriptive method using purposive sampling for data retrieval. Endoparasites were found in 9 types, namely Cucullanus sp. (3 ind), Anisakis sp. (7 ind), Lecithochirium sp. (1 ind), Hamacreadium lethrini (6 ind), Helicometra sp. (1 ind), Siphoderina sp (7 ind). Trypanorhyncha (32 ind), Tetraphylidea (4 ind), and Acanthocephalus sp. (1 ind). Organs infected by endoparasites were stomach (34%), liver (3%), and intestine (63%). The highest prevalence obtained was Trypanorhyncha (37.5%). The highest intensity obtained was Hamacreadium lethrini and Cucullanus sp. about 3 ind / fish. The highest abundance obtained was Trypanorhyncha (80%). The diversity index was 1,583. The length and weight relationship of Red Snapper (Lutjanus sp.) shows isometric relationship after t-test. Long relationship with parasite intensity has a very low relationship with a velue (r) of 0,142. The relationship between weight and parasite intensity has a very low relationship with a velue (r) of 0,139. Based on 9 types of endoparasites found 1 type is zoonotic namely Anisakis sp. that cause Anisakiasis disease.

Potensi Probiotik Skala Rumah Tangga untuk Meningkatkan Laju Pertumbuhan Ikan Nila (Oreochromis niloticus) Ni Luh Ayu Gita Astriani; I Wayan Arthana; Gde Raka Angga Kartika
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Aplikasi probiotik merupakaan salah satu metode alternatif untuk meningkatkan laju pertumbuhan ikan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemberian probiotik terhadap laju pertumbuhan ikan dan mendapatkan dosis optimum untuk Ikan Nila (Oreochromis niloticus). Bakteri yang digunakan dalam probiotik ini yaitu L. bulgaricus, Lactobacillus acidophilus dan Streptococcus thermophillus dengan kepadatan bakteri asam laktat 1.3 x107 CFU/ml. Penelitian ini bersifat eksperimental dengan menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari empat perlakuan dan tiga kali pengulangan yaitu perlakuan I (10 ml/kg pakan), perlakuan II (15 ml/kg pakan), perlakuan III (20 ml/kg pakan) dan kontrol (tanpa probiotik). Data pertumbuhan dianalisis menggunakan metode One Way ANOVA (Analysis of Variance) dengan program Statistical Product and Service Solution (SPSS) yang dilanjutkan dengan Uji Duncan pada taraf kepercayaan 95% Hasil laju pertumbuhan berat mutlak tertinggi terdapat pada perlakuan II yaitu 3,31 gram/28 hari, diikuti oleh perlakuan I 3,03 gram/28 hari, perlakuan III 2,82 gram/28 hari, dan kontrol 2,37 gram/28 hari. Laju pertumbuhan spesifik tercepat terdapat pada perlakuan II yaitu 4,95 %/hari, perlakuan I 4,70 %/hari, perlakuan III 4,54 %/hari dan kontrol 4,21 %/hari. Tingkat kelulushidupan tertinggi terdapat pada kontrol yaitu 97,78%, diikuti oleh perlakuan III yaitu 91,11%, perlakuan II 80% dan perlakuan I yaitu 71,11%. Tingkat konversi pakan (FCR) terbaik terdapat pada perlakuan II karena memiliki FCR terendah yaitu sebesar 0,98, kontrol 1,03, perlakuan III 1,04 dan perlakuan I yaitu 1,29. Perlakuan II merupakan dosis optimum untuk Ikan Nila karena mengahasilkan laju pertumbuhan dan FCR terbaik, serta tingkat kelulushidupan (SR) yang masih diatas perlakuan I.

Tingkat Kesuburan Muara Tukad Aya, Jembrana Bali Berdasarkan Kelimpahan Plankton dan Ketersediaan Nutrien Josua Siagian; I Wayan Arthana; Dewa Ayu Angga Pebriani
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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River estuaries have characteristics that were directly related to the sea, resulting of mixing water which resulting in a unique in terms of complex and dynamic environment and community structure of biota that was different from other waters. The purpose of this study was to determine the fertility level of Muara Tukad Aya base on the abundance of plankton. This research was conducted in February-March 2019 using descriptive quantitative methods. The average value of water quality in the three stations, namely turbidity ranges from 11.5 to 12.48 NTU, temperature 27.61-31.20C, current speed 0-0.2 m / s, brightness 72.32-86.8 cm, salinity 16.0-17.94 ppt, pH 8.02-8.14, Nitrate 0.5-1.05 mg / L, Phosphate 0.08-0.2 mg / L, DO 7.7- 8.8 (mg / L). The abundance of phytoplankton was found in 37 genera, the total abundance at station I (upstream of the estuary) was 1501 cells / l, at station II (open area of estuary) was 1322 cells / l and station III (close area of the estuary) with an abundance of 833 cells / l. Zooplankton abundance was 6 genera, where total abundance at station I was 9 ind / L, station II was 11 ind / l while station III was 10 ind / l . Water quality parameter values at estuary Tukad are still good and optimum except phosphate levels , The abundance of phytoplankton with nitrite and nitrate has a close relationship with the correlation coefficient -0.9014 and 0.8994.

Pertumbuhan Ikan Tongkol Abu-Abu (Thunnus tonggol) yang Didaratkan di Pangkalan Pendaratan Ikan (PPI) Kedonganan Muhammad Alfiansyah Mahmud; I Wayan Restu; Made Ayu Pratiwi; Gde Raka Angga Kartika
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Longtail Tuna fish (Thunnus tonggol) is one of economically important fish in the Bali Strait. The aim of this study was to assess the growth study of Longtail Tuna fish in the Bali Strait so as to provide an overview of the conditions and threats of Longtail Tuna fish landed at PPI Kedonganan. The study was conducted in November 2018 - January 2019. Data analysis consist of species composition, distribution of long frequencies, patterns and parameters of growth. Data processing was performed using Microsoft Excel and FISAT II. The results shown that Longtail Tuna fish landed at PPI Kedonganan included in fishermen's by-catchs and have a range of 418 mm - 643 mm. Longtail Tuna fish landed at PPI Kedonganan have growth pattern that is negative allometric (length increase is more dominant than weight gain) and parameters of growth asymptotic length (Loo) is equal to 675.15 mm with growth coefficient (K) is 0.10/month in and a life span is 164 months.

Identifikasi dan Intensitas Rocinela sp. Pada Ikan Kerapu di Pantai Kedonganan, Jimbaran, Bali Ni Luh Ayu Trisnayanti; I Made Damriyasa; Endang Wulandari Suryaningtyas
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This research was aims to determine the intensity level of Rocinela sp. in groupers. Grouper fish samples were taken at Kedonganan Beach, Jimbaran, Bali. Grouper fish is a type of fish that lives around coral reefs, that have a high economic value. Grouper fish sampling was done randomly method, so that the length and weight of the grouper samples used will be more diverse. Fish samples obtained at Kedonganan Beach will be excamine for parasites at the Fisheries Laboratory, Marine and Fisheries Faculty, Udayana University. The grouper samples observed in this study were 40 individuals. The type of parasite found in grouper is Rocinela sp. This parasite belongs to the order of Isopoda which is a type of ectoparasite that attacks fish. Ectoparasites are a type of parasite that infects the outside of a fish's body, such as the gills, mouth, eyes, and operculum. Ectoparasites can cause damage and impaired function in the infected organ. Based on the results of the study found Rocinel sp. in 26 fish sampled with a total number of parasites of 28 individuals. Most of these parasites were found in the gills with a percentage of 92.6% and some were found in the operculum with a percentage of 7.4%. The intensity value of parasitic Rocinela sp. that is 1,067, this value indicates infection of Rocinela sp. which is low in grouper fish at Kedonganan Beach, Jimbaran, Bali.

Potensi Pengembangan Budidaya Ikan Gurame (Osphronemus gouramy) di Keramba Jaring Apung Danau Batur Kintamani, Bali Gede Pasek Sutedja; I Wayan Arthana; Ayu Putu Wiweka Krisna Dewi
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Penelitian ini bertujuan untuk mengetahui ukuran benih ikan Gurame (O. gouramy) yang optimal untuk budidaya pada keramba jaring apung di Danau Batur yang dilihat dari laju pertumbuhan dan kelulushidupan benih ikan Gurame. Penelitian ini dilakukan di Keramba Jaring Apung yang terletak di Desa Trunyan, Bali. Pengambilan data dilakukan setiap dua minggu dalam waktu tiga bulan dari bulan November 2018 – Januari 2019. Pengukuran panjang benih ikan, berat benih ikan dan kualitas air dilakukan secara insitu. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari tiga perlakuan dan tiga kali pengulangan yaitu perlakuan A (Benih ikan ukuran 3 cm), perlakuan B (Benih ikan ukuran 4 cm), dan perlakuan C (Benih ikan ukuran 6 cm). Hasil penelitian ini mengindikasi benih ikan Gurame dapat hidup pada Keramba Jaring Apung di Danau Batur. Benih ikan Gurame perlakuan A menunjukan pertumbuhan yang paling baik dengan nilai SGR 0,80± 0,058%/hari, panjang mutlak 3,49 ± 0,22 cm/3 bulan, panjang nisbi 116,44 ±7,43%/3 bulan, dan nilai SR sebesar 72 ± 0,061%/3 bulan. Kualitas air yang didapat selama penelitian yaitu suhu dengan nilai rata-rata 26,8 ± 0,89 ºC, nilai pH rata-rata sebesar 8,3 ± 0,93, dan nilai DO rata-rata sebesar 6,3 ± 1,45 ppm.

Tingkat Dekomposisi Bahan Organik Pada Substrat Dasar Tambak Udang Vannamei (Litopenaeus vannamei) di Desa Patas Bagian Timur, Buleleng, Bali Yuli Andriani Situngkir; Alfi Hermawati Waskita Sari; Ima Yudha Perwira
Current Trends in Aquatic Science Vol 2 No 2 (2019)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Budidaya udang vannamei secara intensif memberikan konsekuensi peningkatan bahan organik yang diakibatkan oleh sisa pakan dan kotoran udang. Penelitian ini bertujuan untuk mengetahui tingkat dekomposisi bahan organik substrat dasar tambak udang vannamei intensif yang ada di Desa Patas Bagian Timur Buleleng. Sampel substrat dasar tambak diambil dari 8 petak tambak yang ada di Desa Patas Bagian Timur Buleleng. Sampel tersebut kemudian dianalisa kandungan C-organik, nitrogen total dan jumlah total bakterinya. Kandungan C-organik dianalisa dengan menggunakan metode Walkley and Black, kandungan nitrogen total dianalisa menggunakan metode Indophenol dan jumlah total bakteri dianalisa dengan menggunakan metode Total Plate Count. Berdasarkan hasil analisa diketahui bahwa rata-rata C-organik, nitrogen total dan jumlah total bakteri masing-masing sebesar 29,4%, 1,6%, dan 5,8×105 CFU/ml. Dari hasil tersebut diketahui nilai rasio C/N sebesar 20,33 dengan kata lain tingkat dekomposisi pada substrat dasar tambak dalam kondisi seimbang. Analisa korelasi menunjukkan bahwa terdapat hubungan antara rasio C/N dengan jumlah total bakteri (R2=0,7237). Kondisi kualitas air berada dalam kondisi yang optimal sesuai dengan baku mutu kualitas air menurut PERMEN-KP RI Nomor 75 Tahun 2016 tentang Pedoman Umum Pembesaran Udang Windu (Penaeus monodon) dan Udang Vannamei (Litopenaeus vannamei).

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