Alga kompetitor pada rumput laut menghambat sinar matahari, sehingga mengganggu proses fotosintesis. Penelitian dilakukan di Desa Pager Betoh Kecamatan Bluto dan Desa Tanjung Kecamatan Saronggi Kabupaten Sumenep, dengan mengkaji identifikasi spesies alga kompetitor dan prevalensi spesies alga kompetitor. Parameter penunjang mengenai kualitas perairan. Spesies alga kompetitor dari dua Stasiun di lokasi penelitian sebanyak 6 spesies yaitu Chaetomorpha crassa, Sargassum sp., Turbinaria ornata, Acanthophora spicifera, Enteromorpha intestinalis, dan Hypnea cervicornis. Rata-rata prevalensi gangguan alga kompetitor tertinggi di Desa Pager Betoh pada Stasiun 1 rakit ke 1 yaitu spesies Chaetomorpha crassa dengan persentase mencapai 17,24%.

Algae seaweed competitors at blocking sunlight, thereby disrupting the process of photosynthesis. The study was conducted in the village Pager Betoh District of Bluto and Desa Tanjung subdistrict Saronggi Sumenep, by reviewing competitors algal species identification and prevalence of algae species competitors. Supporting parameters regarding water quality. Algae species competitors of the two stations in the study site as much as 6 species are Chaetomorpha crassa, Sargassum sp., Turbinaria ornata, Acanthophora spicifera, Enteromorpha intestinalis, and Hypnea cervicornis. The average prevalence of nuisance algae which compete with highs in the village Pager Betoh at Station 1 raft to 1 ie species Chaetomorpha crassa with the percentage reached 17.24%

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