Judul: Visual and olfaction responses of groupers to baits in relation to fishing effectiveness
.
Abstrak: The mechanisms of bait detection by the groupers through vision and o lfactory sense in pot fishing have not been thoroughly studied. The general objective of this research is to reveal the vision and olfactory responses of groupers to various baits as attractors, and its relationship with the pot fishing effectiveness. The research was carried out from June 2007 to March 2008, conducted in two phases: phase I (laboratory scale) covering investigations on the grouper’s retinal physiology and brain weight ratio to reflect the function of olfactory and vision organs analysis o n chemical contents of baits, and reaction of groupers to the baits; phase II covering the field test, measuring the pot fishing effectiveness on groupers using natural and artificial baits. Comparative experiment methods were used and non parametric stat istical method (i.e. the median test) was applied to test the significancy of the results.
Keyword: catching effectiveness, density of cone cells, visual axis, sighting distance range, environment condition

Judul: The Use of Vertical Bait to the Catch of The Lift Net in Palabuhanratu Bay
Abstrak: Penggunaan umpan secara vertikal dilakukan karena adanya dugaan sifat ikan yang menyukai besaran iluminasi cahaya tertentu sehingga ikan tersebar pada kedalaman yang berbeda. Umpan vertikal berfungsi untuk memikat dan mengumpulkan ikan pada area penangkapan bagan apung. Penelitian ini bertujuan untuk membandingkan komposisi hasil tangkapan bagan apung perlakuan dan kontrol, menentukan pengaruh penggunaan umpan vertikal terhadap jumlah total hasil tangkapan dan frekuensi hauling. Penelitian ini menggunakan metode experimental fishing dengan analisis data yang digunakan yaitu analisis deskriptif dan analisis statistik. Hasil penelitian menunjukkan bahwa total hasil tangkapan bagan apung memperoleh 19 jenis ikan dengan 5 jenis ikan dominan yaitu ikan tembang (Sardinella gibbosa), lisong (Euthynnus affinis), pepetek (Leiognathus equulus), semar (Mene maculate), dan cumi-cumi (Loligo sp). Penggunaan umpan vertikal berpengaruh nyata terhadap hasil tangkapan bagan apung dan frekuensi hauling bagan apung perlakuan berjumlah 82 kali, frekuensi tersebut lebih banyak dibandingkan dengan bagan apung kontrol yang hanya berjumlah 50 kali., The initial indication of using vertical baits is that some fish are attracted by a certain amount of luminance so that the fish are depth-stratified. Vertical baits can help luring a large amount of fish at the nearby fishing ground. The purpose of this study is to compare results between the catch of the controlled variable (commercial floating liftnets) and liftnet with vertical baits, to determine the impacts of using vertical baits to the total catch and hauling frequency of the liftnet. The method used to conduct this study is experimental fishing with descriptive and statistics data analysis. Results showed that the catch could make as 19 species caught, with 5 most dominant species. Those are; goldstripe gardinella (Sardinella gibbosa), mackerel tuna (Euthynnus affinis), common ponyfish (Leiognathus equllus), moonfish (Mene maculata), and squids (Loligo sp). The results concluded that by using vertical baits had indeed a significant impact to the total catch and the hauling frequency with the number of 82. It was indeed improved plenty more than the controlled variable which is only 50 times.
Keyword: Attractor, bait, hauling, lift net, vertical

Judul: Sintesis Paduan Ti-6Al-4Nb sebagai Matrial Implan Pengganti Komponen Tibial
Abstrak: Synthesis of Ti-6Al-4Nb alloy was done by melting using Tri Arc Melting Furnace. Each sample was remelted five times to ensure the homogenity. Aluminum and niobium addition were expected to stabilize α phase and β phase until the αβ-titanium alloy was resulted. Yet based on the experiment, it was α-titanium alloy resulted. α-titanium alloy was a Hexagonal Close Packed (HCP) crystalline structure which would be cracked if deformation non-uniaxial happens. The presence of oxygen in pure titanium significantly increased the hardness of titanium. The addition of aluminum was also able to increase the hardness of titanium alloy because aluminum more stabilize the α phase in the α-titanium alloy. The corrosion ressistance of titanium could be increased by adding aluminum and niobium. Titanium coating with HA/chitosan composite was also proved in decreasing the corrosion rate because it barried direct interaction between titanium alloy and corrotion solution.
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