Judul: Status stok sumberdaya ikan lemuru (Sardinella lemuru) di Perairan Selat Sunda
Abstrak: Sardinella lemuru is one of small pelagic fish and become one of fishing target. The aim of this research is to determine the stock status, proper and sustainable management of Sardinella lemuru in the Sunda Strait area based on fish catch landed on PPP Labuan. This research was conducted from May- September 2014. Data analysis consist of sex ratio, length and weight relationship, condition factor, gonadal maturity level, fecundity, length distribution, age group identification, growth parameter, exploitation rate and surplus production model. The result of this research showed that the growth pattern of female Bali Sardinella is negative allometric and the male Bali Sardinella is isometric. Exploitation rate has exceeded the optimum exploitation rate. Surplus production model analysis showed that MSY is 372.46 ton per year and optimum effort amount is 285 trip per year. Management that can be suggested are the limitation of fishing effort and yield, the selectivity of fishing gear, and determine fishing season.
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Judul: Status stok sumberdaya Ikan Lemuru (Amblygaster sirm Walbaum, 1792) di Perairan Selat Sunda
Abstrak: Ikan lemuru salah satu sumber daya yang tertangkap di PPP Labuan, Banten merupakan pelagis kecil yang hidup pada perairan tropis. Penangkapan yang dilakukan terus menerus diduga mengakibatkan penurunan populasi ikan lemuru di Selat Sunda. Penelitian ini bertujuan untuk menentukan status stok bagi ikan lemuru di Perairan Selat Sunda. Penelitian dilakukan pada bulan Mei-Spetember 2016. Jumlah ikan lemuru contoh adalah 873 ekor yang terbagi dalam 553 jantan dan 320 betina dengan sebaran panjang 120-220 mm. Analisis pola pertumbuhan didapatkan hasil bahwa ikan lemuru betina bersifat allometrik negatif sedangkan pada jantan bersifat isometrik. Nilai hasil tangkapan maksimum lestari (MSY) dan upaya optimum (fMSY) yang diperoleh dari model Fox adalah sebesar 727,5 ton dan 2433 trip. Laju eksploitasi ikan lemuru baik betina dan jantan sudah melebihi nilai optimum. Status stok ikan lemuru di perairan Selat Sunda berdasarkan analisis laju eksploitasi sudah mengalami overexploitation. Upaya penangkapan ikan lemuru masih dapat ditingkatkan karena masih dalam status underfishing.
Keyword: growth, spotted sardinella, surplus production model

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
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