Pulau Bunyu mempunyai luas 192.32 km2 memiliki potensi hasil perikanan tangkap berlimpah di wilayah lautnya, salah satunya yaitu sumberdaya ikan kerapu lumpur (Epinephelus sp.). Epinephelus sp. merupakan ikan dikenal dengan “groupers” memiliki sifat hidup soliter, memangsa ikan dan krustase serta komoditas perikanan mempunyai nilai ekonomis cukup tinggi. Penelitian bertujuan tentang model dan sifat pertumbuhan Epinephelus sp. Metode penelitian secara deskriptif kuantitatif dengan pengambilan sampel purposive sampling yang dilakukan di pos penjualan ikan pulau Bunyu selama 2 bulan (Febuari-Maret 2023) dengan 8 kali sampling, menghasilkan total sampel sebanyak 240 ekor. Analisis model pertumbuhan menghasilkan parameter pertumbuhan yaitu nilai koefisien pertumbuhan (K), panjang infinitif, dan dugaan umur pada panjang null (t0) pendekatan von Bertalanffy. Hasil penelitian menghasilkan struktur umur dengan persamaan y = 0.0142x + 2.85353 dan nilai R2 = 0.5826. Model (L∞)pertumbuhan persamaan model Von Bertalanffy adalah Lt = 131.608 {1 - 2.71828-0.0194(t - 0.801835)}. Parameter pertumbuhan panjang infinitive mencapai (L∞) = 131,608 cm diperkirakan terjadi ketika ikan kerapu (Epinephelus sp.) mencapai umur 918 hari. Koefisien pertumbuhan (Kn) 0,0194 cm/hari dan estimasi umur pada panjang teoritis null (to) = -0,801 hari. Sifat pertumbuhan diekspresikan dalam hubungan panjang berat Epinephelus sp. menunjukkan pola pertumbuhan allometrik positif dalam total sampling. Hal ini berarti pertambahan berat lebih cepat dibandingkan dengan pertumbuhan panjang atau kondisi tubuh ikan kerapu cenderung gemuk atau montok. Nilai faktor kondisi (Kn) rerata ikan kerapu yagn dihasilkan sebesar 1,88 dengan persentase jumlah sampel ikan kerapu yang bentuk tubuhnya montok/gemuk sebesar 51,25%.

Kata Kunci: Hubungan Panjang Berat, Ikan Kerapu Lumpur, Panjang Infinitive, Koefisien Pertumbuhan, Perairan Bunyu

Bunyu Island has an area of 192.32 km2 and has the potential for abundant capture fisheries in its marine area, one of which is mud grouper resources (Epinephelus sp.). Epinephelus sp. fish known as "groupers'' have a solitary nature of life, prey on fish and crustase and fishery commodities have a high economic value. The research aimed to find out the model and growth properties of Epinephelus sp. The quantitative descriptive research method with purposive sampling was cerried out in Bunyu island fish sales pots for 2 months (February-March 2023) with eight samplings, resulting the 240 samples. analysis of the growth model produces growyh parameters, namely the value of growth coefficient (K), infinitive lenght, (L∞) and estimated lifespan at the null lenght (t0) von bertalanffy approach. The results produced an age structure with the equation y = 0.0142x + 2.85353 and R2 value = 0.5826. The growth model equation of the Von Bertalanffy model is Lt= 131.608 {1 - 2.71828-0.0194(t - 0.801835)}. The infinitive lenght growth parameter reaching (L∞) = 131,608 cm is estimated to occur when grouper (Epinephelus sp.) reaches 918 days. Growth coefficient (Kn) 0,0194 cm/day and estimated lifespan at theoretical lenght null (t0) =-0.801 days. The nature of growth was expressed in the relationship of weight lenght Epinephelus sp. It showed a positive allometric growth pattern in total sampling. This means that weight gain was faster than the growth in lenght or body condition of groupers that tend to be fat or plump. The average condition factor (Kn) value of grouper produced was 1.88 with the percentage of grouper samples whose body shape was plump / fat of 51.25%. Keywords: Length Weight Relationship, Mud Grouper Fish, Infinitive Length, Growth Coefficient, Bunyu Waters