Rumput laut adalah salah satu komoditas perikanan yang perlu mendapatkan perhatian khusus terkait kualitas rumput laut untuk mendapatkan agar-agar berkualitas tinggi. Gracilaria verrucosa merupakan jenis rumput laut yang paling utama sebagai sumber penghasil agar (agarofit) yang sebagian besar dimanfaatkan baik dikonsumsi secara langsung maupun untuk kebutuhan industri. Penelitian ini bertujuan untuk mengetahui kualitas rumput laut yang meliputi kandungan rendeman agar, kadar air, kadar abu, serat kasar, Clean Anhydrous Weed (CAW), pengotor, viskositas, gel streght, derajat putih serta kadar sulfat rumput laut yang dibudidaya di tambak Kabupaten Karawang, Jawa Barat, dengan pendekatan analisis diskriptif berdasarkan hasil uji kimia di laboratorium. Penelitian ini dilakukan pada Bulan September 2017, dengan mengambil sample rumput laut dan kualitas air tambak sebanyak 15 stasiun secara acak. Berdasarkan hasil analisis kualitas agar-agar Gracilaria verrucosa di Kabupaten Karawang menunjukkan bahwa secara umum kualitas cukup baik. Kadar sulfat hanya mencapai 4.82% yang artinya bahwa zat pengotor dalam kandungan agar-agar relative rendah, yaitu di bawah 6%. Akan tetapi terdapat beberapa parameter yang kualitasnya cukup tinggi yaitu viskositas dan gel strenght. Viskositas agar mencapai 201.6 cps dan kekuatan gel strenght 356.76 g/cm2.

Abalone is one of aquaculture commodity that has a high value including in Indonesia due to its price, taste and nutrition content. Unfortunately there is problem in abalone's transportation process which caused stress and even death. Clove oil can be used as anesthetic agent for abalone to obtain a high survival rate because of its eugenol content. This research tried to evaluate the the effect of clove oil as anesthesia agent to determined induction time, survival rate and oxygen cosumption in H squamata. This study used an experimental method and used a completely randomized design with treatment concentration of clove oil solution were 0.5 ml/L (A), 0.7 ml/L (B), 0.9 ml/L (C), and 1.1 ml/L (D) which each treatment was repeated three times, and calculated the value of the abalone (H. Squamata) survival rate after maintenance for 14 days. The results of the study showed that the survival rate of abalone seeds obtained in the treatment with the concentration of 1.1 ml/L (D). In the treatment also showed the fastest induction time with 96.67 seconds. The lowest oxygen comsumption rate in this study was treatment D with concentration of 1,1 ml/L. It could be concluded that using clove oil with concentration of 1.1 ml/L as anasthesic compound for abalone showed effectiveness in induction time, survival rate, and oxygen consumption rate.

The fish cultivation system in several villages in Kalitengah District uses an overtime system, namely a fish cultivation system that is carried out within 1 year (12 months) without passing rice planting. The research objective was to determine the abundance of plankton and the status of water quality fish cultivation “sawah tambak” with overtime system in Kalitengah District Lamongan. This is a quantitative research using descriptive methods. Based on the plankton abundance value at Station 1,2 and 3, the waters in the overtime system of ponds are in the Eutrooph category, with the abundance value > 12,000 Ind / L. Meanwhile station 4,5, and 6 are included in the Oligotrooph category since its abundance <10,000 Ind / L. The diversity value is within the range of 0.714267-1.823 which include in the category of small diversity and low community stability because the value of 0 <H '<1.5. All stations are in a moderate level of pollution which the diversity index value is within the range of 1 <H '<3. The Dominance Index (D) is in the range 0.212-1.224, Station 1 has a high dominance value because of the dominant species, namely Batrachospermum. Water quality parameters at all stations such asthe temperature ranges between 28.8-34.2 0C; the pH 8.5-9.2; Dissolved oxygen  4-10.44 mg / l; ammonia 0.009-0.17 mg / l; phosphate ranges from 0.025-2.3 mg / l. From the measurement results, water quality parameters show a good value for the growth of aquatic organisms.

This study aims to determine the highest production of planting Gracilaria verrucosa wich is cultivated in the ponds of Tlogosadang Village, Paciran Sub-District, Lamongan District by treating different spacings and initial seed weights. The cultivation method used was longline with a distance of 25 cm between longlines. The treatments were given in the form of spacings of 10 cm, 20 cm, and 30 cm, while the treatments of seed weights were 50 g, 100 g, and 150 g. Treatments were carried out in a pond measuring 20x5 m with a water depth between 90-102 cm depending on the tides. Sampling was conducted every 7 days for 50 days of maintenance by weighed, controlled, and measurement water quality. Before planting seaweed, pond preparation were carried out which included drying, liming, fertilizing to filling the water. This study used a Completely Randomized Factorial (CRF) Design consisted of two factors, namely spacing and seed weight, each with three levels. Data analysis used One-Way ANOVA showed that the treatment of spacing and seed weight gave a very significant difference (P <0.01), so it was continued with the Orthogonal Polynomial Test to see trends. The test results showed that the highest seaweed production was found at a spacing of 20 cm and a seed weight of 50 g, namely 2423.7 g/m. The water quality as a support for the growth of seaweed measured during the study showed that the waters ware classified as good and suitable for the cultivation of Gracilaria verrucosa seaweed.   Keywords: Gracilaria verrucosa, longline, seaweed, seed weight, spacing

Sutchi Catfish is one of the important fish commodities in Indonesia. Unfortunately, its seasonal spawning pattern causes limited supply. Cryopreservation is a solution to solve limited supply since it can store the spermatozoa in low temperature so that physiological, biological and morphological functions still remain. Improving the quality of cryopreservation is important to increase the success of Sutchi Catfish aquaculture. Adding honey in cryopreservation process is expected to increase the quality of spermatozoa since it contains with sugars as a source of spermatozoa's energy. This study tried to compare the effectivity of honey in cryopreservation process with no addition. The treatments used in this study were T1 (0% honey), T2 (0.2% of honey), T3 (0.4% of honey), T4 (0.6% of honey) and T5 (0.8% of honey). 30 days after stored, the spermatozoa were checked their motility, viability, abnormality, fertility and hatching rate. This study showed that honey addition could increase the motility significantly (P<0.01) to 23.14% better than control. The viability increased significantly (P<0.01) to 23.17% better than control. The abnormality test did not show significant difference between honey addition and control although the abnormality value in control was the highest (10.75%). The fertilization rate increased significantly (P<0.01) to 28.85% better than control. The hatching rate increased significantly (P<0.01) to 29.78% better than control. The success of all test indicated that the addition of honey in cryopreservation process of spermatozoa could be performed on Sutchi Catfish to increase its production even though the limited spawning pattern.

An abalone is a group of marine molluscs that have high economic value. To increase abalone production, such cultivation needs to be done considering that abalone production still dominating. However, there are still obstacles in the cultivation which is the high mortality rates on the grading process of juvenile abalone. The fatality occurs due to the traditional grading process by gouging abalone to separate abalone that is attached to the substrate. The use of ethanol as an anesthetic material is expected to minimize the mortality and increase the survival rate of abalone. In this study, the use of ethanol by 30 ml/L as an anesthetic material can separate the abalone from its substrate 447.67 seconds faster than the dose of 10 ml/L. However, the 30 ml/L dose also showed the lowest survival rate of 86.67%. The best recovery test is at 10 ml/L with the fastest recovery time of 143.33 seconds which has a high survival rate of 98.33%. The success of anesthesia by using ethanol in this study can also be done in the grading process of abalone seed and can minimize death due to the traditional grading process.

Waduk Joto merupakan waduk yang berada di Kabupaten Lamongan yang biasa digunakan oleh masyarakat sekitar untuk aktifitas sehari-hari. Selain itu aliran air waduk juga digunakan untuk kegiatan perikanan dan pertanian. Dalam pengelolaan suatu perairan yang lestari dan berkelanjutan diperlukan informasi dasar mengenai tingkat kesuburan perairan guna pemanfaatan yang tepat. Penelitian ini bertujuan untuk mengetahui kualitas air dan status kesuburan perairan di Waduk Joto Kabupaten Lamongan. Metode pengumpulan data menggunakan purposive random sampling pada tiga stasiun yaitu bagian inlet, tengah, dan outlet. Penentuan status kesuburan perairan berdasarkan perhitunganmenggunakan Carlson Trophic State Index (TSI). Pengambilan sampel air dilakukan dengan interval waktu satu bulan sekali selama 3 bulan pada bulan Desember 2020 sampai Februari 2021. Parameter yang diamati meliputi suhu, kecerahan, pH, salinitas, oksigen terlarut (DO), nitrat, total fosfat, klorofil-a. Hasil penelitian menunjukkan bahwa status kesuburan perairan Waduk Joto pada bulan Desember 2020 – Februari 2021 berdasarkan TSI Carlson termasuk dalam kategori perairan hipereutrofik dengan nilai sebesar 74. Disarankan untuk melakukan penelitian lanjutan pada musim yang berbeda untuk mengetahui status kesuburan perairan di musim kemarau.

Udang vaname (Litopenaeus vannamei) merupakan salah satu sumberdaya hayati perairan bernilai ekonomis penting dan telah dibudidayakan secara komersial adalah pada penerapan teknologi sederhana sampai intensif dalam produksi udang vaname di wilayah tropis telah menunjukkan bahwa udang vanamei memiliki keunggulan dibandingkan dengan jenis udang yang lain. Tujuan dari penelitian ini adalah untuk mengetahui strategi pemasaran gelondongan udang vaname yang diterapkan oleh pengusaha udang vaname di Kabupaten Lamongan (yang dilaksanakan di Kecamatan Glagah, Kecamatan Deket dan Kecamatan Babat). Jenis penelitian ini adalah kualitatif dengan teknik pengumpulan data yang digunakan yaitu data primer dan data sekunder. Metode penelitian ini menggunakan studi kasus (case study). Analisis data yang digunakan dalam penelitian ini analisis deskriptif (akumulasi atas data dasar dalam cara deskriptif semata-mata tidak perlu mencari atau menerangkan saling berhubungan, menguji hipotesis, membuat peramalan, atau mendapatkan makna atau implikasi). Hasil penelitian ini menunjukkan bahwa berdasarkan perhitungan matriks SWOT posisi. Strategi untuk pengembangan gelondongan udang vaname di Kabupaten Lamongan berada pada kuadran I yaitu menggunakan Strategi Agresif dimana pengusaha memiliki kekuatan dan peluang yang besar. Jadi di harapkan pengusaha harus lebih meningkatkan usahanya sehingga bisa mencapai peluang dan bisa menambah kekuatan dari usahanya.