P - Fisheries and Marine
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Browsing P - Fisheries and Marine by Author "Ahmad, Muchtar"
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Item Fatigue And Stress For Jack Mackerel (Trachurus Japonicus) During Capture Process By Ecg Monitoring(2016-04-04) Nofrizal; Ahmad, Muchtar; Arimoto, TakafumiA simulation experiment was conducted in the flume tank to investigate fish stress and physiological condition during swimming in active sampling methods through electrocardiograph (ECG) monitoring. Jack mackerel, Trachurus japonicus of 18.68±0.90 cm fork length (average ± S.D., n = 90) was forced to swim in the flume tank with the swimming speed levels of 1.09-9.12 FL/s at 10, 15 and 22°C respectively. The heart rate was measured by impleting a pair of electrode at pericardial cavity region of fish, which was conected to digital oscilloscope via an bio-amplifier. The highest stress level was occurred at vicinity of the maximum sustained and prolonged swimming speed. This indicated that the heart rate was increasing steadily to reach 3.60 times greater than control value for 10°C, 4.03 for 15°C, and 4.20 for 22°C. The recovery time for post-exercise was monitored to be the longest (up to 543 min) at these swimming speed levels. The physiological conditions of jack mackerels are discussed in relation to the cardiac activities during active sampling gear process.Item Management and Production Technology of The Traditional Dockyard in Bagan Siapiapi, Indonesia(2016-03-30) Nofrizal; Ahmad, Muchtar; Syaifuddin; Sukandi, FarianA series research activity was conducted on four traditional wooden dockyards in Bagan Siapiapi, Indonesia to be conscious production technology and management system of the traditional dockyard for producing wooden boat. Six respondents were interviewed from four traditional wooden dockyards, which as an owner of dock yard, foreman, and carpenter. The data of wooden boatbuilding skill, management of employee, material and tools for wooden boatbuilding, and quality assurance were collected and then those are described and analyzed. The results show that the productions of traditional wooden dockyards were decrease since 2007 to 2012 due to limited wooden material for boat’s construction. Wooden boatbuilding technology is traditionally carried out by the simple equipment, i.e. 82.4% of tools used manually by hand and 17.6% mechanical equipment with electric power. Boatbuilding skill was obtained by them from generation to generation. Almost all of boat construction was made of wood, which they obtained around Rokan Hilir, Rokan Hulu and Bengkalis Regency. Wood processing for boat construction is conducted by sunlight drying, whichever after coated by kerosene or diesel oil. Even though, the boat production generated by the traditional wooden dockyard still gets quality assurance, such as boat performance and leak test. Further, production technology and management of the traditional wooden boat dockyard in Bagan siapiapi are discussed detail in this paper.