Judul: Study on Standing Stock of Small Pelagic and Demersal Fish Assessment and Its Relationship with Oceanographic Condition in South China Sea, Indonesian Waters
Abstrak: An accurate data and information of standing stock of fish resources are much needed to exploit target fish. Joint field survey of standing stock assessment were counducted in Indonesian Southern part of the South China Sea on Juni 2005 and July 2006 by PRPT Fisheries Research Center (BRPK-Marine and Fishery Research Agency) Marine and Fishery Ministry and South East Asean Fisheries Development Centre (SEAFDEC). The objectives of this study are to assess the standing stock of fish resources and its relationship between fish distribution and density with oceanographic parameters. The estimation of standing stock was conducted using three different methods. First, by acoustic method to obtain the distribution, density and biomass of fish from scientific echosounder split beam transducer. Echograms were processed and analyzed using Sonar Data EchoView software. Secondly, by remote sensing method to obtain net primary productivity from MODIS AQUA satelite. Satellite images were analyzed using Data Analysis System (SeaDAS). Thirdly, by swept area method to obtain biomass of demersal fish from trawling. The acoustic result show that distribution of single fish target strength in location survey is dominated by the small fish of < 10 cm long. In June 2005, the average density of the fish is between 0.006 to 10.96 fish m-³, and in July 2006 is between 0,05 to 2,95 fish m-³. In Juni 2005, the standing stock of fish by acoustic method was 2 055 148,61 ton (18.07 ton km-²). Of this, 1 070 798.83 ton (9.41 ton km- ²) were pelagic fish and 984 615.26 (8.66 ton km-²) demersal fish. While in July 2006, overall fish were 707 317,22 ton (9.22 ton km-²), 222 029,53 ton (2,89 ton km-²) pelagic fish and 485 287,70 ton (6,23 ton km-²) demersal fish, respectively. The standing stock of fish by remote sensing method were 1 941 202.60 ton in 2005 and 524 314.86 ton in 2006. The standing stock of demersal fish by swept area method was 95 630.80 ton with density of 0.84 ton km-². Base on the fish production data in 2004 was 420 282 ton y-1, so the level of exploitation has reached 26.29% in 2005 and 85.31% in 2006. The pelagic fish was considered over exploit in 2006 than 2005, while the demersal fish was still under exploitation.
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Judul: Stock and fishing capacity analysis for demersal fisheries in  Togean Islands, Central Sulawesi
Abstrak: The information on stock and fishing capacity in a particular fishing ground can be a useful information for the sustai nable fisheries management in the area. Fishing capacity is one of the important indicator to assess the pressure on the use of marine resources. There are two objectives of the study; to analyze the distribution, density, and abundance of demersal fish, and to analyze the efficiency of fishing capacity of the demersal fish in Togean Islands, Centra l Sulawesi. The study was conducted in two stages. The first stage was done by analys ing the stock using split beam echosounder hidroacoustic to obtain the di stribution, density and abundanc e of fish; and the second stage was done by analysing fishing capacity of demersal fish by using Data Envelop Analysis (DEA) method to estimate the effi ciency level of the fishing vessels and gear in Togean Islands.
Keyword: density and abundance of fish, fishing vessels, total biomass, bottom gillnet

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf