Handling of fish on-board Quality and safety issues
Handling of fish on-board Quality and safety issues in fish handling ----- A course in quality and safety management in fishery harbours in Sri Lanka NARA, DFAR, ICEIDA and UNU-FTP Department of Fisheries and Aquatic Resources (DFAR)
National Aquatic Resources Research and Development Agency (NARA) United Nations University Fisheries Training Programme (UNU-FTP) Icelandic International Development Agency (ICEIDA)
Sri Lanka Sri Lanka Iceland Iceland Content Video about handling on-board
Current practices and improvements Handling of tuna on-board Learning objectives After this lecture the participants will have: an overview of the situation in Sri Lanka regarding handling on board ideas on how to improve the situation Video Handling of fish on-board
- UK - Current practices Fish is put in hold at sea temperature Fish is stored loose in hold (pressure on fish in lower layers) Fish is cooled with crushed block ice or flake ice Handling time on deck is long (in heat) Gutting and bleeding usually not practised
Video Storing fish in the hold Possible improvements Put fish into ice slurry in an insulated tub after catch for cooling down fast for bleeding
Put cold fish into boxes in hold easier handling less pressure on lower layers possible to use day markings Manual transport equipment Sack or case truck
Hand-drawn truck Hand pallet truck Temp. (C) Cooling rates in the center of cod comparison of flake ice and liquid ice Flake ice
Ice Iceslurry slurry Time (hours) Cooling /keeping cool Ice slurry is good for cooling fish down quickly compleatly surrounds the fish
good heat transfer Flake ice is good for keeping fish cool keeps fish moist while melting blood water and slime is washed off This may require less ice than the current practices and give much better quality fish Video
Small boat in Reykjavik harbour PRE-HANDLING AND HOLDING METHODS FOR OCEAN TUNA Content of this lecture The importance of handling and storage of ocean tuna
Diagram of handling and storage of raw material COMMON SPECIES OF OCEAN TUNA IN SRI LANKA Big eye tuna Yellow fin tuna
The importance of prehandling and holding of ocean tuna Assure good quality of raw material Prevention of histamine formation
Maintain quality of raw ocean tuna If catching, pre-handling and holding is not done properly Appearance will be changed
Colour and flavour of flesh can be changed The importance of handling and holding of ocean tuna (Continued) Histami ne Histidine
Histidine decacboxylaza Histamine Diagram of HANDLING and holding of OCEAN TUNA Catching, gaffing and landing
CATCHING, GAFFING AND LANDING THE FISH Always gaff the fish through the head. Use two gaffs for big fish, the second through the mouth It is advisable to lift the fish tail to help haul it on-board Carry out all subsequent
handling on a foam pad KILLING THE NEWLY- LANDED TUNA Once aboard, the fish should be killed immediately Bleeding Bleeding the tuna by making a cut in the side of the fish with a knife, five to ten centimeters behind the base of pectoral fin recess, on both sides of
the fish. Blood should flow freely from these cuts. GUTTING OF FISH The gutting of fish can bring about the following advantages: Make subsequent chilling more effective
Remove undesirable digestive enzymes Prevent undesirable bacteria in the fish intestine from spreading Avoid the penetration of parasites such as nematodes from the gut into the flesh
Cleaning of fish Scrub the inside of the abdominal cavity without removing the white membrane which covers the backbone. Carefully rinse the fish, inside and outside. The fish is now ready to be placed in brine or ice. ON-BOARD STORAGE It is recommended to use the two following staged procedure to obtain a top-quality fish (like in pre-handling of raw
materials). Lower the internal temperature of the fish by placing it in chilled brine (a slurry of crushed ice and seawater). After the core temperature reaches 0C, put the fish in ice and keep it there until arrival at port. Alternatively, the tuna can be iced directly to reduce temperature. However this method takes longer time
On-board storage UNLOADING of fish The following rules are important during loading: Do not twist the fish when removing them from the ice. They should be held by the head rather than the tail. Handling the fish gently. Do not leave the fish too long in the open air or sunlight. References
1. Training materials on catching and on-board handling of ocean tuna. Pacific Ocean Organisation. 2. INFOFISH (1999) 3.
Hall, G.M (1997). Fish Processing Technology 4. Scombroid Poisoning. FDA (1999) 5. FDA (2003)
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