Penutupan, Rugositas Terumbu Karang dan Kelimpahan Ikan Karang di Perairan Utara Bangkalan

Abstract

Coral reefs are marine organisms in the form of limestone (CaCO3). Reef fish are fish associated with coral reefs. The abundance of reef fish is influenced by the fertility of coral reefs in the waters. This research was conducted in September 2021 in the waters of Lembung Paseser and Labuhan with 2 stations in the waters of Lembung Paseser and 2 stations in the waters of Labuhan. This study aims to determine the condition of coral reefs, percentage of live coral cover, abundance of reef fish, diversity index (H'), uniformity (E), dominance (C) and to determine the relationship between coral reefs and reef fish. The coral cover data collection method is LIT (Line Intercept Transect) and the coral reef rugosity data collection method uses the CIT (Chain Intercept Transect) method, while the coral fish data collection methods are the belt transect method and the Underwater Visual Census (UVS). Percentage of coral cover ranging from 11% to 37% classified as damaged to moderate damage. The abundance of reef fish at station 1 was 0.18 ind/m2, station 2 was 0.106 ind/m2, station 3 was 0.908 and station 4 was 0.216 ind/m2. The average rugosity value at station 1 is 1.17, station 2 is 1.23, station 3 is 1.33 and station 4 is 1.16. The indicator fish species in Lembung Paseser waters were Chelmon rostratus and Heniochus diphreutes as many as 7 individuals while the indicator fish species in Labuhan waters were Chaetodon vagabundus and Heniochus diphreutes as many as 15 individuals. The correlation between coral reef cover and reef fish was 54.06% which showed a strong correlation, while the correlation between coral reef rugosity was 73.52% which showed a strong correlation.

Terumbu karang merupakan organisme laut berupa batuan kapur (C_aCO₃). Ikan karang merupakan ikan yang berasosiasi dengan terumbu karang. Kelimpahan ikan karang dipengaruhi oleh suburnya terumbu karang di perairan. Penelitian ini dilaksanakan pada bulan September 2021 di perairan Lembung Paseser dan Labuhan dengan 2 stasiun perairan Lembung Paseser dan 2 stasiun di perairan Labuhan. Penelitian ini bertujuan untuk mengetahui kondisi terumbu karang, persentase tutupan karang hidup, kelimpahan ikan karang, indeks keanekaragaman (H'), keseragaman (E), dominasi (C) dan untuk mengetahui hubungan terumbu karang dan ikan karang.  Metode pengambilan data tutupan karang yaitu LIT (Line Intercept Transect) dan metode pengambilan data rugositas terumbu karang menggunakan metode CIT (Chain Intercept Transect), sedangkan metode pengambilan data ikan karang adalah metode belt transek dan Underwater Visual Sensus (UVS).  Persentase tutupan karang berkisar 11% sampai 37% tergolong rusak hingga kerusakan sedang.  Kelimpahan ikan karang pada stasiun 1 sebesar 0,18 ind/m², stasiun 2 sebesar 0,106 ind/m^2, stasiun 3 sebesar 0,908 dan stasiun 4 sebesar 0,216 ind/m². Nilai rugositas rata rata pada stasiun 1 yaitu 1,17, stasiun 2 yaitu 1,23, stasiun 3 yaitu 1,33 dan stasiun 4 yaitu 1,16. Jenis Ikan indikator di Perairan Lembung Paseser yaitu Chelmon rostratus dan Heniochus diphreutes sebanyak 7 individu sedangkan jenis ikan indikator di Perairan Labuhan yaitu Chaetodon vagabundus dan Heniochus diphreutes sebanyak 15 individu. Korelasi hubungan tutupan terumbu karang dan ikan karang sebesar 54,06% yang menunjukkan hubungan kuat sedangkan kolerasi hubungan rugositas terumbu karang sebesar 73,52% yang menunjukkan hubungan kuat.