Pendugaan Hasil Maksimum secara Ekonomi (MEY) & Sosial

Pendugaan Hasil Maksimum secara Ekonomi (MEY) & Sosial

Pendugaan Hasil Maksimum secara Ekonomi (MEY) & Sosial (MScY) Daduks S Static efficient sustained yield Apakah MSY berarti efisiensi ?, efisiensi berkaitan dengan upaya memaksimalkan keuntungan bersih (net benefit) dari penggunaan sumberdaya SESY: tingkat pemanfaatan dimana jika bisa dipertahankan konsistensinya akan menghasilkan net benefit terbesar setiap tahunnya Asumsi (Gordon-Schaefer, 1959): 1. harga ikan konstan dan tidak bergantung pada seluruh penjualan 2. marginal cost dari sebuah unit effort adalah konstan 3. Catch proporsional dengan ukuran stok (Y = q f B) Keuntungan dan biaya fishing effort (dollar) Total cost R(Ee) Keuntungan

C(Ee) Ee Em Ec Gambar 12.2. Efficient sustainable yield dalam Perikanan Jumlah fishing effort (unit) Dalam setiap sustainable yield, catch, populasi, efffort levels dan net benefits konstan sepanjang waktu Ee = efficient level effort : net benefit maksimal MSY ??? Tidak effisient Keuntungan dan biaya fishing effort (dollar) Net benefit Total cost Y0 R(Ee) Keuntungan C(Ee) fMEY

fMSY f0 Jumlah fishing effort (unit) Prinsip Dasar Model Bioekonomi Gordon-Schaefer B r Y r * B * B 2 t k Y q * f * B q*k B k *f r r q * f * B r * B * B k r q * f * r * * B k q*k Y q * f (k *f) r q2 * k Y q * k * f *f2 r a

b Y q2 * k U q * k ( )* f f r U a b * f 2 Y/f, U (ton/unit) Y (catch, ton) SCHAEFER (1959) (a/2b , a /4b) 2 Y a * f b * f U a b * f (a/2b , a/2) a C E U a b * E 2

f, Effort (unit) f, Effort (unit) f MSY a 2b 2 YMSY a 4b a b Penerimaan (Revenue, R) dan Biaya (cost, c) TR p * Y TC c * f TR TC TR = Total penerimaan p = harga per satuan berat Y = hasil tangkap TC = Total cost (biaya) c = cost (biaya) f = Unit alat tangkap = manfaat ekonomi = keuntungan

p af bf 2 cf Catch(Y) $ (Rp) MODEL BIOEKONOMI BEP Profit max = Biaya (TC) Y_MSY Penerimaan (TR) Catch fMEY f_MSY f_MScY Fishing effort (f) KESEIMBANGAN BIOEKONOMI TR TC 0 TR TC p (a bf ) f cf a c fo b bp fo = f open access

=f Mscy Yo a . fo b . fo 2 ac c 2 Yo bp bp 2 c. f 0 Yo p Yo = Y open access =Y Mscy PENDUGAAN Max Economic Yield (MEY) 2 max p * a * f p * b * f c * f p.a 2 p.b. f c 0 f YMEY a f MEY b f MEY YMEY a2 c2 4b 4bp 2 2

f MEY ap c 1 fo 2bp 2 PENDUGAAN Max Economic Yield (MEY) R = Y x Harga = (a.f + b.f2) x Harga; fFAE x Biaya = (a fFAE + b fFAE 2) x Harga; sehingga: fFAE = (Biaya/Harga) a)/b. Tugas Rumah NO TAHUN EFFORT (purse seine = unit) CATCH (ikan lemuru = ton) (f) (Y) 1 1990

6 650 2 1991 12 1.050 3 1992 35 1.650 4 1993 67 1.700 5 1994 111 2.500

6 1995 145 3.000 7 1996 175 3.200 8 1997 180 3.000 9 1998 190 2.650 10 1999 192

2.000 11 2000 195 1.500 12 2001 198 1.200 13 2002 198 1.000 Dari Tugas 01, Jika diketahui: Harga ikan lemuru = Rp. 2.000.000 per ton & Biaya ( c) = Rp. 200.000/trip; 120 trip/thn PERTANYAAN: 1) Hitung jumlah hasil tangkap: tingkat sosial (YO) ; dan Maks ekonomi (YMEY) 2) Hitung Jumlah alat tangkap: tingkat sosial (fO) ; dan Maks ekonomi (fMEY) 3) Hitunglah keuntungan () pada saat effort MSY, MEY, MScY

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