小型イカ釣り漁船のエネルギー収支

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書誌事項

タイトル別名
  • Energy Audit of Small Scale Squid Jigging Boats in Western Japan
  • コガタ イカ ツリ ギョセン ノ エネルギー シュウシ

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説明

Squid jigging with fish attraction lamps is a selective fishing method that produce high quality squids, but considered to consume large amount of fuel. To secure the profitability of this fishing by reducing energy consumption, we need to perform an energy audit of squid jigging boat. Amount of fuel consumed and landing value for 34 boats of 19-ton class in Nagasaki showed a strong linear-relationship, but its slope was smaller than the past relationship due to a rise of fuel price and installation of more lamps. Voluntary regulated maximum electrical output for lighting for boats operating in a coastal area of Nagasaki has increased to approximately 20 times in 20 years while catch amount has increased to 2-3 times. Thus, excessive use of fuel for lighting power competition has gradually caused difficulty to keep a catch level that is appropriate to the invested value. Fuel consumption in operation processes such as fishing with light and cruising was investigated with considering energy management structure of squid jigging boats. All boats consumed the largest amount of fuel during fishing with light and the amounts consumed were expressed by a linear relationship that was proportional to amounts of electricity used by boat sizes. Fuel saving during cruising process was however efficient in some cases because fuel consumption in operation processes were different by fishing areas and seasons.

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