The aim of research on Economic Valuation of Marine Tourism Benan Island Senayang subdistrict Regency of Lingga, Riau Islands Province has been conducted in February-March 2018 with the respondents were 24 visitors by accidental sampling. The purposes of this research are (1) To analyse the cost of travel visitors; (2) Identify factors influencing the demand of recreation; (3) Analyse wilingness to pay the visitors; (4) Estimate the value of consumer surplus and economic value of marine tourism Benan Island. From the results of study is known tourists who visit is local tourists and foreign tourists, travel cost marine tour visitors on the Island of Benan is IDR.58.831.962 consisting of travel expenses, consumtion, admission, lodging fees, corporation fees and other expenses. The collected data were analyzed using multiple regression analysis model. Factors affecting local tourist visit include travel and distance while for foreign tourists include travel expenses, income, age, and distance. Willingness to pay local tourists IDR.13.611,- and foreign tourists are willing to pay IDR. 25.666,- seen form the average value. The accumulatedof the consumer surplus can generate economic value of marine tourism Benan Island. The value of consumer surplus obtained by local tourists IDR.437.580.527,8,- with the economic value IDR.54.403.454.471,- while foreign tourists surplus value of consumer IDR.1.881.652,496,- and economic value of IDR.210.662.562,5,- so that the total economic value marine tour of Benan Island is IDR.54.627.141.360,5,-.

Produktivitas alat tangkap telah menjadi hal penting bagi pengelolaan perikanan tangkap yang bertanggung jawab dan berkelanjutan. Tujuan Penelitian ini untuk mengetahui gambaran perikanan pukat cincin di Pelabuhan Perikanan Nusantara (PPN) Sibolga mencakup deskripsi armada, komposisi hasil tangkapan dan produktivitas penangkapan pukat cincin di PPN Sibolga berdasarkan trip penangkapan dan ukuran kapal. Penilitian ini telah dilaksanakan dari Bulan Juli hingga Agustus 2016 di Pelabuhan Perikanan Nusantara Sibolga Provinsi Sumatera Utara. Metode yang digunakan dalam penelitian ini yakni metode survei. Data diambil menggunakan kuesioner dengan metode wawancara. Armada penangkapan pukat cincin yang berbasis di PPN Sibolga memiliki Gross tonnage 58 - 117 GT dengan kapasitas penggerak berkisar antara 140-600 HP. Jenis ikan yang paling banyak tertangkap adalah cakalang yaitu 40.41 persen dari total hasil tangkapan sebesar 142.757 kg. Trip penangkapan tertinggi di peroleh tahun 2012 yaitu sebanyak 234 trip dari 207 unit penangkapan pukat cincin. Hasil tangkapan terbanyak terdapat pada tahun 2013 yaitu 352.246 kg dari 212 unit penangkapan pukat cincin. Produktivitas per trip tertinggi yaitu 2.57 ton/trip pada tahun 2013 dan produktivitas per GT tertinggi yaitu 3.87 ton/GT pada tahun 2013.

Fishing is a very dynamic activity. Fisheries activities in Indonesia are multispecies and multigear fisheries activities. In Indonesia, catching certain species targets with a variety of fishing gear, and vice versa one type of fishing gear captures various catch targets. This also happened to the Pantura fishermen in East Java, for example gillnet bottom. Bottom gillnet is mostly used by the East Java Pantura fishermen specifically to catch the crab like that of Paciran fishermen, Lamongan and some of them specifically catch important economical demersal fish such as gulamah fish, like those of Tuban fishermen. Various things carried out by the fishermen, are a form of adaptation carried out with the aim of getting the optimal catch. The pattern of adaptation by gillnet fishermen varies, for example by changing the length of fishing operations, changing fishing grounds, adding a piece of net or reducing a piece of net. Changes in the length of fishing operations are determined by the ability of the ship to operate. So far, various forms of adaptation, whether there are differences both designally and technically between gillnet specifically for fishing and gillnet crab catchers, and their compatibility with SNI (Indonesian National Standards), especially in Pantura, East Java, has not been done. The method used in the research in this study is descriptive analysis of the results of measuring the condition of fishing gear in the field which is then compared with the existing SNI. Based on the results of the study there are several regions that are not in accordance with the existing SNI, but based on the habits carried out by fishermen.

This research was conducted in November 2016 - May 2017 in Parasites and Fish Disease Laboratory of Marine and Fisheries Faculty University of Riau. The purpose of this research is to know the dosage and the ability of propolis solution in inhibiting the growth of Aeromonas hydrophila bacteria and the safe dosage used for common catfish with LD50tested by immersion. The used methodwere experiment and sensitivity test using Kirby Baeur Disk Diffussion method from dose 100% to 0.5% and repeated 3 times. The used dosage in Minimum Inhibitory Concentration (MIC) tests were 9%, 8%, 7%, 6% and 5%. While LD50 toxicity test using common catfish (Clarias sp) with dose 5%, 6% and 7% for 24 hours. The results showed that the propolis solution was able to inhibit the growth of A. hydrophila bacteria with the smallest dosage of 0.9% equal to 90 ppm, with the diameter inhibitory average zone of 6.78 mm, the safest dose of MIC was present at 6% doses equivalent to 600 ppm with 8,15 mm inhibition zone width and inhibited bacterial growth A. hydrophila with an average number of colonies as much as 278 Cells/mL. LD50toxicity test using MIC dosage results showed that no fish mortality for 24 hours.

This research was conducted in April 2019 to determined TSS concentrations using Landsat 8 OLI Satellite imagery and of to the coefficient TSS concentrations at period of before and after Lapindo mudflow event using Landsat 8 OLI satellite imagery in Porong River estuary Sidoarjo Regency East Java Province. TSS from 25 sampling points with 3 replication were taken from the estuary. The result showed that fluctuation of TSS occured around Porong River estuary before and after Lapindo mudflow event from 2000-2019. Algoritm of Budhiman (2004) got the best result for analyst TSS concentration around Porong River estuary. The highest concentration was in estuary. In 2008, the concentration in estuary was 216,07 mg/l. (R2 =0,915 ; r = 0,957). The Development of Algoritm of Budhiman (2004) produced formula of TSS (mg/l) = -6.7625 + (1.2129 * (8.1429 * (Exp (23.704 * 0.94 * Band-Red))))

This research was conducted from July-August 2017. The purpose of the research is to know the effect of adding the chicken feather meal in fish food which was fermented by Bacillus sp. The fermented chicken feather meal was added to the food for adjusting the leukocytes differentiation of Silver Pompano (Trachinotus blochii). The method was an experimental method with a Completely Randomized Design (CRD), one factor with six treatments level. The for 180 fishes. This research used six treatments such as, Kn (negative control): without fermented chicken feather meal by Bacillus sp. in the feed and were not infected by Vibrio alginolyticus, Kp (positive control): without fermented chicken feather meal byBacillus sp. in the feed and were infected by V. alginolyticus, P1-P4 respectively: fermented chicken feather meal by Bacillus sp. in the feed 5%, 10%, 15% and 20%. The collected data is; leukocytestotal, leukocytes differentiation, the average of weight, and survival rate. The results showed that there were a significant effect of adding the fermented chicken feather meal by Bacillus sp. in the feed to the leukocytes total and leukocytes differentiation of Silver Pompano (Trachinotus blochii). The best treatment was 10% of Bacillus sp.(P2) wich was shown by the80,53x103 cells of leukocytes total, 80,33% of lymphocytes, 9,67 % of monocytes, 10.00 % of Neutrophils, , 5,30 g was the average of weight and100 % of survival rate.

The research was conducted from October until Desember 2018 at the Laboratories of Marine Chemistry and Marine Microbiology, University of Riau and Integrated Chemical Laboratory, University of Muhammadiyah, Riau. The Purpose of this research was to determine the inhibition of Xylocarpus granatum extracts on the growth of pathogenic bacteria (P. aeruginosa, E. coli and V. alginolyticus). Samples used for were leaves, fruits, and rods extract of X. granatum andthe extacts was preferred different at concentrations 100%, 50%, 25% and 12,5%. The result showed that the highest concentration at 100 %, rod was the best extracts to against the growth of pathogenic bacteria and the antimicrobial compound could inhibit thr growth of pathogenic bacteria (P. aeruginosa, E. coli and V. alginolyticus) with intermediate ability with clear zone diameter between 0,3 – 10 m

This study aims to determine the effect different of temperature on growth and survival rateof Kryptopterus lais.This research was conducted at the Aquaculture Laboratory, Faculty of Fisheries and Marine Science University of Riau, on march to may, 2018. The trial fish used in this research was Kryptopterus lais.The experimental design used was completely randomized design with 5 treatments and 4 replicateswith four treatment temperature25oC, 27oC, 29oC, 31oC, and 33oC. Analysis was performed on specific growth rate weigh, ansolute growth, specific growth rate and survival rate. The results showed that the specific growth rate weigh (34,22 ± 0,22e), ansolute growth (5,75 ± 0,29c), specific growth rate(7,12 ± 0,03d) and survival rate (92,50 ± 2,89b) is highest in treatment temperature29oC.Temperature effect in treatment of 29oC had significant effect on specific growth rate weigh, ansolute growth, specific growth rate and survival rate(p < 0.05). it can be concluded that the optimum temperatureimproved specific growth rate weigh, ansolute growth, specific growth rate and survival rate.

This research was conducted in March-April 2019 in the waters of Tanjung Balai Asahan, North Sumatra Province. Aim to determine the particle size of sediments, determine the abundance and distribution patterns of kerang darah (A. granosa), and analyze the effect of particle size of sediments and organic matter on the abundance of kerang darah (A. granosa). Sediment and kerang darah (A. granosa) samples were taken using a grab sampler from 4 stations, each station consists of 5 sampling points. The results showed that the environmental conditions of Tanjung Balai Asahan waters were still able to support the life of kerang darah (A. granosa). The type of sediment in these waters is dominated by sandy mud.The average diameter of sediments (Mz) 3- 7.7 Ø with classification as very fine sand-very fine silt. The highest average content of organic sediment is found at station 2 (13.70%) which is located around the mangrove forest which is included in the classification of medium organic matter. The highest average value of kerang darah (A. granosa) abundance is at station 4 (54 ind/m2 ), with a clustered distribution pattern at all stations. The relationship between sediment characteristics and abundance of kerang darah (A. granosa) in Tanjung Balai Asahan waters is classified as a strong relationship with a determination coefficient (R2 ) of 0.529, this means that the size of sediment particles 52.9% affects the abundance of kerang darah (A. granosa) throughout the station while the remaining 41.7% are influenced by other factors not examined. The relationship of the content of organic matter with the abundance of kerang darah (A. granosa) is classified as a weak relationship, with a coefficient of determination (R2 ) of 0.004, meaning that the content of 0.4% sediment affects the abundance of kerang darah (A. granosa) throughout the temporary station 99.6% is influenced by other factors not examined