Southeast Asian Fisheries Development Center/Training Department (SEAFDEC/TD)


Catch per Unit of Fishing Effort and GHG gas of pilot purse seine fishing vessel

Catch per Unit of Fishing Effort and GHG gas of pilot purse seine fishing vessel
CPUE and GHG of the pilot vessel_revised.pdf
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03 December 2020

Catch per Unit of Fishing Effort and GHG gas of pilot purse seine fishing vessel

In Southeast Asia, Thailand is one of the contributions to global seafood because of the nutrition of marine productions. Purse seine fishing, take an account is one of the activities that contribute to seafood production, requires a consideration of energy (man and machine), and the negative impact of the fishing activities and vessel operations.

A pilot purse seine fishing vessel, namely “Nor. Lapprasert 8” is a vessel that has coordinated with the Southeast Asian Fisheries Development Center (SEAFDEC/TD) since 6 July 2018. The main objective of this project is onboard labor reduction during the fishing phase also enhance working practices and living conditions on board and aims with applied hygiene on board and LIFE concepts to catch fish and preserve freshness as fresh as at sea served to the consumers. This pilot purse seine fishing vessel was kickoff 1st fishing operation together with the SEAFDEC staff from 8 to 12 February 2019.   

Currently, the total period of the project by improving the fishing gears (Net plan), fishery machinery, and fish handling tools by adopting an appropriate technology to improve energy efficiency. (Fuel saving/energy efficiency) improve practices, working condition and reducing manpower on the fishing vessels had passed more than 2 years and 4 months


Results (before and after) implementing the project

Manpower Onboard (MO): Before implementing the project, the pilot purse seine fishing vessel needed more than 30 fishers for a fishing operation. With the objective to reducing the manpower on board from 30 to 17 fishers. The average hauling time from sea to onboard is less than an hour and a half, down for 30 minutes than before.

Living Space (LS):  The living space before had an approximate 72 square meter (4 levels of 3m x 6m space) was shared among 29 fishers (The skipper sleeps in a different area) each fisher had an average of 2.5 square meters of space onboard and After reconfiguration, the 72 square meter living area is now shared by only 17 fishers (excluding the skipper), hence each fisher now has 4.23 square meters of workspace.

Total Catch (CT): Since early 2019 till today. The first fishing operation till now the catch data (logbook) had recorded. The total catch of pilot purse seine fishing vessel an approximate 260,500 kg. and the average catch (Per voyage) amount of 13,583 kg. Which from the inquiries obtained the information on the average fish price per kilogram is approximately 30 Baht/kg Therefore, the fishing vessel owner will have a total income amounting to 7,815,000 Baht. (Not deducting expenses).

Fishing Trip (FT): Referring to the Thailand regulations as defined the fishing vessel more than 30 GT will have the fishing permitted not over 240 days/year. In practice, the average fishing voyage of a pilot purse seine fishing vessel is an approximate 11 days/trip referred to the statistics the total fishing operation of this vessel currently is 219 days completed.

Green House Gas Emission (GHG Emission): Carbon emission is the release of Carbon dioxide gas from the burned of fossil fuel into the atmosphere. Hence, this is simply talking about greenhouse gas emissions from the fishery sector as one of the sources of carbon emission which affects climate change. Because there are more than 5,500 commercial fishing vessels.

Fuel Consumption (FC): Fuel consumption is the rate at which an engine uses fuel, expressed in units such as voyage miles per liter, liters per working-hours, or liters per kilogram of the catch. Which is a pilot purse seine fishing vessel that used Cummins Engine brand model K-500. Since the first fishing operation till now and referring the data record for fuel consumption, Average fuel consumption, working-hours of engine operation as the detail follows: 

To calculate the CO2 emission from the fuel consumption: 1 liter of diesel weighs 835 grams. Diesel consists of 86,2% carbon or 720 grams of carbon per liter diesel. To burn this carbon to CO2, 1920 grams of oxygen is needed. The sum is then 720 + 1920 = 2640 grammes of CO2/liter diesel.

Example: The consumption of propulsion engine is 246.73 Liters/day then corresponds to 246.73 x 2.64 kg CO2    = 651.36 kg CO2 /Liters

Catch Per Unit Effort (CPUE): also called catch rate is frequently the single most useful index for long-term monitoring of a fishery. Which declines in CPUE may mean that the fish population cannot support the level of harvesting. Increases in CPUE may mean that a fish stock is recovering, and more fishing effort can be applied. CPUE can therefore be used as an index of stock abundance, where some relationship is assumed between that index and the stock size. The simple calculation of CPUE is the total catch divided by the total amount of effort used to harvest the catch.  


  1. The U.S. electricity generation by the electric power industry resulted in the emission of carbon dioxide (CO2). This equaled about 0.99 pounds of CO2 emissions per kWh.
  2. The approximate electricity consumption per ton of ice (box) produced for the icemaker and refrigeration plant for temperate and tropical areas approximately 60 kWh/ton. Do not include requirements for handling, crushing, or storage.




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