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"Microalgae has high nutritional value and are used to feed adult and larval stages of bivalves, the larvae of some fish and crustaceans and zooplankton. However, microalgae production for aquaculture animal is very expensive. To overcome this, the use of preserved microalgae such as algae concentrate and dried algae, or algal substitutes has been developed. There are both advantages and disadvantages to this alternative food. For example, even though the cost production for algal substitute yeast-based diet is cheaper, their nutritional value is much lower compared to fresh microalgae. Moreover, there is no significant difference in nutritional value between preserved (concentrated or dried) and fresh microalgae; however, preserving microalgae for long periods will affect their nutritional value. In spite of this problem, preserved microalgae such as algal concentrate and dried algae seem to be more effective to feed bivalves than algal substitutes yeast based diet due to their availability and relatively high nutritional value. Furthermore, algae concentrates are more suitable to replace fresh algae than dried algae. "

"Penelitian dilakukan untuk mengidentifikasi dan mengetahui kelimpahan mikroplastik yang terkandung pada sampel air, sedimen, kerang dara (Anadara granosa), kerang kampak gigi (Pinna muricata) dan kerang bulu (Anadara gubernaculum) yang diambil di Perairan Pulau Pramuka, Kepulauan Seribu, DKI Jakarta. Sampel air, sedimen dan Bivalvia diambil menggunakan metode jelajah bebas pada bagian selatan dan barat Perairan Pulau Pramuka. Sampel Bivalvia diambil masing-masing 10 sampel pada setiap spesiesnya. Analisis mikroplastik pada penelitian ini menggunakan metode pengapungan. Hasil penelitian menunjukan bahwa semua sampel yang didapatkan mengandung ke 4 jenis mikroplastik yaitu fiber, frgamen, film dan pellet dengan dominasi mikroplastik jenis fiber dengan persentasi lebih dari 75 % pada setiap sampelnya. Hasil penelitian menunjukan kelimpahan mikroplastik pada sampel air sebesar 54,5 ± 4,45 partikel L-1, pada sampel sedimen sebesar 58.000 ± 14.519,25 partikel Kg-1, sampel kerang dara 26,84 ± 3,88 partikel / g Ind-1, sampel kerang kampak gigi sebesar 82,06 ± 30,10 partikel / g Ind-1 dan pada sampel kerang bulu sebesar 27,83 ± 9,14 partikel / g Ind-1. Hasil uji non-parametrik Krusskal-wallis pada rata-rata kelimpahan mikroplastik pada sampel Bivalvia menunjukan bahwa terdapat perbedaan rata-rata antara kelimpahan mikroplastik pada sampel Bivalvia di Pulau Pramuka, Kepulauan Seribu, DKI Jakarta.

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This research was conducted with the aim of identifying and knowing the abundance of microplastics contained in samples of water, sediment, blood cockles (Anadara granosa), Prickly pen shells (Pinna muricata) and Hairy arck cockles (Anadara gubernaculum) taken in the waters of Pramuka Island, Seribu Islands, DKI. Jakarta. Samples of water, sediment and bivalves were taken using the free roam method in the southern and western parts of Pramuka Island waters. Bivalvia samples were taken from 10 samples from each species. Microplastic analysis in this study used the flotation method. The results showed that all samples obtained contained 4 types of microplastics, namely fiber, fragment, film and pellet with a predominance of fiber type microplastic with a percentage of more than 75% in each sample. The results showed the abundance of microplastics in the water sample was 54.5 ± 4.45 L-1 particles, the sediment sample was 58.000 ± 14,519.25 particles Kg-1, blood cockles sample was 26.84 ± 3.88 particles /g Ind-1 particles, prickly pen shells sample was 82.06 ± 30.10 particles /g Ind-1 and 27.83 ± 9.14 particles / g Ind-1 on hairy arck cockles. The results of the Krusskal-wallis nonparametric test on the average abundance of microplastics in the Bivalvia sample showed that there was an average difference between the abundance of microplastics in the Bivalvia sample on Pramuka Island, Seribu Islands, DKI Jakarta."