Judul: Use of Coffee Coffea canephora husk waste in feed on the growth performance of goldfish Cyprinus carpio
Abstrak: Permasalahan pada budidaya ikan mas (Cyprinus carpio) adalah rendahnya efisiensi pakan, maka dari itu diperlukan suatu bahan untuk meningkatkan efisiensi pakan pada ikan mas. Penelitian ini bertujuan mengevaluasi pengaruh penggunaan limbah kulit kopi robusta (Coffea canephora) dengan dosis berbeda pada pakan terhadap kinerja pertumbuhan ikan mas. Ikan mas yang diuji pada penelitian ini memiliki bobot 7,14±0,2 g. Ikan dipelihara selama 60 hari pada akuarium berukuran 40×40×50 cm. Penelitian ini menerapkan rancangan acak lengkap dengan lima perlakuan pakan yang diberi limbah kulit kopi sebanyak 0%, 1%, 2%, 3%, dan 4% serta masing-masing perlakuan terdiri dari tiga kali ulangan. Hasil penelitian menunjukkan kinerja pertumbuhan terbaik pada perlakuan pemberian 1% kulit kopi dengan efisiensi pakan 49,53±0,03 %, dan laju pertumbuhan harian sebesar 1,36±0,00 g (p<0,05). Penambahan 1% dosis kulit kopi dapat meningkatkan laju pertumbuhan pada ikan mas., The problem in carp farming (Cyprinus carpio) is the low feed efficiency. Therefore, an ingredient is needed to increase feed efficiency in goldfish. This study aims to evaluate the effect of using robusta coffee skin waste (Coffea canephora) with different doses in feed on the growth performance of goldfish. The goldfish tested in this study weighed 7.14±0.2 g. The fish were reared for 60 days in an aquarium. The fish were reared for 60 days in an aquarium measuring 40×40×50 cm. This study applied a completely randomised design with five feed treatments containing 0%, 1%, 2%, 3%, and 4% coffee skin waste and each treatment consisted of three replicates. The results showed the best growth performance in the treatment of 1% coffee peel with, feed efficiency of 49.53±0.03%, and daily growth rate of 1.36±0.00 g (P < 0.05). The addition of 1% dose of coffee skin can increase the growth rate of goldfish.
Keyword: ikan mas, kinerja pertumbuhan, kulit kopi

Judul: Growth Performance of Common Carp Cyprinus carpio With Four Different Commercial Feeds
Abstrak: Pakan yang diberikan pada ikan mas harus memiliki kandungan nutrien yang dapat dicerna dengan baik oleh ikan mas sehingga ikan mas dapat tumbuh secara optimal. Penelitian ini bertujuan mengevaluasi kinerja pertumbuhan ikan mas (Cyprinus carpio) yang diberi pakan empat merek berbeda dengan kandungan protein yang sama. Penelitian menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan dan tiga ulangan, yaitu pakan komersial A (27,88%), pakan komersial B (27,86%), pakan komersial C (27,94%), dan pakan komersial D (27,85%). Ikan mas yang digunakan memiliki bobot 13,27 ±0,01 g/ekor dengan padat tebar 15 ekor per akuarium, dipelihara selama 50 hari. Parameter yang diamati, yaitu rasio konversi pakan (RKP), tingkat kelangsungan hidup (TKH), jumlah konsumsi pakan (JKP), laju pertumbuhan spesifik (LPS), rasio efisiensi protein (REP), retensi protein (RP), retensi lemak (RL), dan average daily gain (ADG). Pemberian pakan D menunjukkan kinerja pertumbuhan pada ikan mas yang lebih baik dibandingkan dengan pakan lainnya., The feed given to common carp must contain nutrients that can be digested properly by common carp so that common carp can grow optimally. This study aims to evaluating the performance of common carp (Cyprinus carpio) growth when provided with four different brands of feed with the same protein content. The study used a completely randomized design (CRD) with four treatments and three replications, namely commercial feed A (27,88%), commercial feed B (27,86%), commercial feed C (27,94%), and commercial feed D. (27,85%). The common carp used weighed 13,27 ± 0.01 g/individuals with a stocking density of 15 individuals per aquarium, reared for 50 days. Parameters observed were feed conversion ratio (FCR), survival rate (SR), total feed consumption (TFC), specific growth rate (SGR), protein efficiency ratio (PER), protein retention (PR), fat retention (FR), and average daily gain (ADG). D feeding showed better growth performance in common carp compared to other feeds
Keyword: Kinerja pertumbuhan, Ikan mas, Pakan

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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