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Widigdo B, Rukisah, Laga A, Hakim AA, Wardiatno Y. 2017. Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia. Biodiversitas 18: 1316-1323. The mud crab, Scylla serrata lives associated with mangrove ecosystems and is widely distributed in the Indo West-Pacific. The present work was aimed to reveal the carapace length/width-weight relationships of Scylla serrata in two mangrove ecosystem area of Bulungan District, North Kalimantan- Indonesia, i.e. Kahayan Delta and Tibi Island. The crabs were collected by using ambau pancang (trap) for two months from November to December 2016. A total of 522 individuals were collected and their carapace length, carapace width, and weight were measured. The sex ratio of total collected samples (male to female) was 1:0.79. Carapace length and width of S. serrata caught in these two study area ranged from 40 to 89 mm for male; 32 to 91 mm for female and 59 to 128 mm for male; 53 to 122 mm for female, respectively. The carapace length-weight relationships of total samples showed logarithmic equations as follow: W = -3.2194 + 2.9725 Log CL for male and Log W = -2.2010 + 2.3750 Log CL for female. While the carapace width-weight relationships are as follow: W = -3.9162 + 3.1012 Log CW for male and Log W = -2.6001 + 2.3968 Log CW for female. The b values of carapace width-weight relationship indicated that the growth pattern of male was positive allometric and female was negative allometric. Size frequency of crab population is also presented.

Abstract. Widigdo B, Rifqi M, Mashar A, Nazar F, Wardiatno Y. 2020. The contribution of phytoplankton in the carbon adsorption and stock during shrimp culture in brackishwater ponds. Biodiversitas 21: 5170-5177. In environmental point of view, it is important to determine the potential of adsorption and stock of blue carbon during shrimp farming in ponds with three cultivation technologies namely: extensive/traditional, semi-intensive, and intensive. The aquatic primary productivity approach is used to measure the potential of carbon adsorption in shrimp ponds, while the carbon conversion of chlorophyll-a content is used to measure its stock. The primary productivity and chlorophyll-a content were measured using three ponds for each cultivation technology every ten days from stocking (DOC 0) until the harvest period. The sampling location is in the BLUPPB shrimp pond area of Karawang, West Java - Indonesia. The study concluded that the adsorption and stock of blue carbon varied during shrimp farming in ponds. The primary productivity and chlorophyll-a content of the three cultivation technologies were the significant difference as the results of ANOVA Single Factor. Carbon adsorption average during extensive/traditional, semi-intensive, and intensive shrimp farming in ponds was 1.912832 g C m-3 day-1, 7.097145 g C m-3 day-1 and 8.250195 g C m-3 day-1, respectively. While, the average carbon stock during shrimp farming in extensive/traditional, semi-intensive, and intensive ponds were 0.64896 g m-3, 14.97473 g m-3, and 25.11102 g m-3, respectively.

Carbon emissions and their relation to shrimp farming activities getting more attention by researchers and environmentalists. Emissions of carbon and other greenhouse gases are concluded as drivers of climate change due to global warming. On the contrary, climate change is proven to determine the continuity and sustainability of shrimp farming activities. The dynamics of carbon and profitability are different for the three cultivation technologies (extensive, semi-intensive, and intensive), it caused by differences in the number and types of production inputs, and facilities and infrastructure, and also differences in productivity. This study aims to formulate the blue growth of aquaculture areas in the coastal area of Karawang Regency-West Java related to carbon emission within the DPSIR framework and use trade off analyses to obtain shrimp farming technologies alternative that are low in carbon emissions. Our conclusion to be able to reduce the carbon emissions, and increase the carbon sequestration and stock as effort for shrimp farming blue growth through optimize the spatial use supervision and increase the productivity of shrimp farming. The lowest carbon emission of shrimp farming technology are semi-intensive, intensive and extensive, respectively

Kecamatan Indramayu merupakan salah satu kecamatan di pesisir Kabupaten Indramayu yang memiliki potensi besar dalam memberikan kontribusi produksi udang vaname melalui kegiatan budidaya baik dengan teknologi tradisional maupun intensif. Budidaya udang di Indramayu yang telah berlangsung sejak tahun 1980-an tentunya memberikan dampak terhadap keberlanjutan kawasan pesisir di sekitarnya. Penelitian ini bertujuan untuk menilai status keberlanjutan kawasan pesisir berbasis kegiatan budidaya udang vaname di Kecamatan Indramayu. Metode yang digunakan adalah metode analisis Rap-Shrimp Farm (Rap-SF) hasil modifikasi dari RAPFISH dengan menggunakan 5 dimensi yaitu ekologi, ekonomi, sosial, hukum dan kelembagaan, serta teknologi. Hasil penelitian menunjukkan bahwa status keberlanjutan kawasan pesisir di Kecamatan Indramayu berdasarkan tingkat teknologinya menunjukkan perbedaan. Indeks keberlanjutan kawasan pesisir berbasis budidaya udang vaname dengan teknologi tradisional plus dikategorikan kurang berkelanjutan dengan nilai indeks yang dihasilkan sebesar 50,36 dan untuk teknologi intensif dikategorikan cukup berkelanjutan dengan indeks keberlanjutan sebesar 51,85. Guna meningkatkan status keberlanjutannya maka direkomendasikan strategi pengelolaan kawasan pesisir berbasis budidaya udang vaname dilakukan dengan pendekatan pengelolaan kawasan budidaya berbasis klasterisasi.

Abstrak. Penelitian ini bertujuan untuk mengkaji potensi ekonomi kawasan mangrove serta potensi luas kawasan yang dapat dijadikan sebagai sempadan pantai. Adapun metode analisis yang digunakan yaitu nilai ekonomi mangrove di bagian barat Teluk Pangpang dengan menggunakan metode effect on production (EOP) dan kesesuaian kawasan sempadan pantai. Berdasarkan hasil kajian, diperoleh utilitas konsumen dari kawasan mangrove adalah sebesar Rp.33.187.626,12. Dengan jumlah nelayan mangrove sekitar 350 orang dan luas daerah penangkapan sekitar +489 Ha, maka nilai ekonomi sumberdaya kawasan mangrove dilihat dari fungsi pemanfaatan langsung adalah sebesar Rp.32.189.744,06 per hektar per tahun. Sedangkan untuk potensi kawasan yang dapat dijadikan sebagai kawasan sempadan pantai dari hasil perhitungan tumpang-tindih (overlay) dapat dihasilkan wilayah yang termasuk dalam kategori sangat sesuai yaitu + 127,5 ha, sedangkan sesuai luas + 257 Ha, dan kurang sesuai seluas + 442,1 ha dan tidak sesuai yaitu + 1.910,1 ha.Abstrak dalam bahasa indonesia, tidak lebih dari 250 kata (garamond fond 11)Kata kunci : Teluk Pangpang; Ekonomi mangrove; Sempadan pantai; Rehabilitasi

Scientist and environmentalist highlight the negative impact of a shrimp farm. The last decade analyzed numerous greenhouse gas emissions and aquaculture activities previously discussed. However, there are limited studies that reveal the emission of CO2 and CH4 related to aquaculture activities. The purpose of this study, therefore, is to examine the daily dynamics of these gases flux across the water-air interface of the shrimp ponds using a 3-day observation method and by examining the environmental factors responsible. This research was carried out in TIR Karawang shrimp farm area, with the gas samples were taken six times daily every 4 hours and analyzed using the gas chromatography. The results of this study show that in 24 hours, the minimum CO2 emission (-0.15841+0.19220 mg m-2 minute-1) found at 00.00 – 02.00 local time, and the maximum (0.22544+0.18361 mg m-2 minute-1) at 12.00-14.00 local time. Conversely, the minimum CH4 emission (-0.00024+0.00023 mg m-2 minute-1) was at 00.00-02.00 local time and the maximum (0.00023+0.00017 mg m-2 minute-1) at 12.00-14.00 local time. The dominant environmental factor influencing both gas is temperature. The semi-intensive shrimp farm CO2-e calculated is 0.02707 g C m-2 day-1, for 2,500 m2 ponds within a 110-day of culture, with 7.44545 kg C emitted.

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