Judul: Restocking model of kerapu macan (Epinephelus fusgoguttatus) in sea ranching sistem in Semak Daun shallow water, Kepulauan Seribu
Abstrak: The releasing in the ocean is known as sea ranching. In addition to improving the cultivation and improvement of economic levels of society, the main goal of sea farming is restocking. This study estimated the carrying capacity of the Semak Daun water for the KJA and sea ranching. Estimated carrying capacity of the KJA performed with a load close to the waste feed. Meanwhile, the carrying capacity for sea ranching is approached with primary productivity through the content of chlorophyll-a in the waters. This review based on the carrying capacity of the sewage effluent P found that the carrying capacity of water for KJA is 12.5 – 21.6 ton. Meanwhile, the carrying capacity for brown grouper fish in the sea ranching systems is between 0.70 – 1.06 tons / year with an average of 0.88 tons / year. Growth parameters of the brown grouper are K = 0.27 per year, L ∞ = 97.48 cm, and t0 = -0.44. The natural mortality M = 0.445 per year, and length-weight relationship: W = 0.008L3.16. Restocking model is based on three criteria: the optimal catch corresponding carrying capacity, optimal economic value of yield, and the ability to recover the stock. The study found out that the best alternative policy for sea ranching recruitment type is the A-8, which is 17 cm length seed, stocking density of 2000 fishes, with fishing mortality 0.4. The model produces optimal restocking yield 529.045 kg/year. On the other hand, the best alternative policy for sea ranching harvest type is 17 cm length seed with stocking density 4000 fishes.
Keyword: Kepulauan Seribu, Carrying capacity, Sea farming, Sea ranching, Restocking

Judul: Keberlanjutan Program Sea Farming di Perairan Kepulauan Seribu, Propinsi DKI Jakarta: Analisis Penangkapan Ikan Rucah sebagai Pakan Utama
Abstrak: In order to improve the fish stock, rehabilitation of fish habitat and creating an alternative income for local fishermen in Seribu Island, an integrated program of sea farming has been developing by the local government and supported by Center for Coastal and Marine Resources Studies (CCMRS/PKSPL) IPB. Brown-marbled grouper and humpback grouperhas been selected as the main farming species for this program. The development of grouper aquaculture activites in sea farming needs trash fish as main feed which is derived from fish by sea farming fisherman group and by bought from the others fishermen. The main fishing gears used by the sea farming fisherman’s group in Seribu Islands were fish hook, nylon hook, trap and gill net. This study was conducted in order to investigate the caracteristics of trash fish as a main feed for the sea farming program; to estimate the avaibility and needs of the trash fish for the sea farming program; to evaluate the feasibility of the integrated sea farming business of the trash fish basis in the study area. The result showed that there were 19 species of trash fish has been identified in the study area. The diversity of trash fish which caught by sea farming fisherman’s groups was less than those on another fishermen group. The avability of the trash fish in Seribu Island that caught by sea farming fishermen’s group can fulfill the cultivation needs. Sea farming fishermean group was profitable due to the high value of revenue cost ratio (R/C > 1). The financial analysis indicated that the sea farming fishermen’s group who only bought the trash fish was more profit than the group who caught the trash fish by them self.
Keyword: 

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: