Reports

Processing in line boats / Processing in line boats

Published:

01/10/2010

Authors:

Róbert Hafsteinsson, Albert Högnason, Sigurjón Arason

Supported by:

Technology Development Fund

contact

Sigurjón Arason

Chief Engineer

sigurjon.arason@matis.is

Processing in line boats / Processing in line boats

This project is a collaborative project of the following companies; Matís ohf, Brim hf, Samherji hf, Vísir hf, Hraðfrystihúsið Gunnvör hf and 3X Technology. The aim of the project is to improve the processing processes of longline vessels with a view to reducing the cost of processing, increasing work efficiency and product quality. The result of this report is: Design of a production process on board liner vessels, a result report. Experimental report on thawing of bait, saury, condoms and herring. And a preliminary draft for the design of an automatic train system on board a liner. The main results of the project are the following: Great optimization involves thawing the bait in so-called snail tanks, the thawing time will be reduced from 17 hours to about 2-3 hours. Instead of taking the bait out 17 hours earlier, it is fed directly into the thawing tank from the bait freezer. This method saves a lot of time. Experiments show that fish that are allowed to bleed for approx. 10-15 minutes during a large water change, are then gutted and then cooled down to zero degrees for approx. A special processing process was designed on board liners that addresses these quality stamps. A preliminary draft of an automatic train system on board future liner vessels was also designed. The purpose of such a system is to have no train attendant on board the train, but to arrange and sort it on top of the working deck in the trolleys. The tub then goes into a specially designed tub lift, which was also designed for this project, onto the train and onto special train straps that move the tub to the relevant place on the train.

This project is a collaboration work between; Matis ohf, Brim hf, Samherji hf, Vísir hf, Hradfrystihusið Gunnvör hf and 3X Technology. The object of this project is to improve the process in line boats by reducing production costs, improve working conditions and product quality. The projects payoff is; Design of processing line onboard line boats, payoff report. Experiment report on thawing of bait, Saury, Cuttle and Herring. Also preliminary design of automatic system for loading boxes from holds in line boats. The primary results from this report are as follows: A great increase in efficiency is by thawing the bait in so called screw tanks, the thawing time reduced from 17 hours (current thawing method) down to appr. 2 - 3 hours. Instead of taking the bait out of the freezer 17 hours before use, the screw tank is feed from the freezer simultaneously. Previous experiments show that when the fish is bleeded for appr. 10‐15 minutes, and then gutted and afterwards cooled down to zero degree on Celsius for approx. 20-25 minutes in a special screw tank filled with slush gives increased fish quality. A special processing trail was designed for lineboats which takes into account this quality.

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Reports

"Fat is the bait" - bait from fishery byproducts

Published:

01/11/2007

Authors:

Rósa Jónsdóttir, Soffía Vala Tryggvadóttir, Margrét Bragadóttir, Haraldur Einarsson, Höskuldur Björnsson, Sveinbjörn Jónsson

Supported by:

AVS Fisheries Research Fund

contact

Rósa Jónsdóttir

Group Leader

rosa.jonsdottir@matis.is

"Fat is the bait" - bait from fishery byproducts

The aim of the project was to develop and produce composite baits for longline fishing from underutilized raw materials with newly developed snow technology that has been granted a patent. The chemical composition of bait raw material and the use of algae as antidote in bait were examined, in addition to which fishing experiments were carried out. In connection with the project, an application machine was designed and built, and experiments carried out with it in the spring of 2007 ended with 97% application. The use of algae as an antioxidant in bait was not very effective. The bait was quite developed right at the beginning of the storage experiment, so most likely the algae did not work properly. Vitamin C ice cream coating seemed to provide some protection, although vacuum packaging was most important. Many of the experiments that were carried out on the bait aimed to compare the bait with traditional baits made from the same material. Usually, less power was obtained from the bag bait, which can be traced in part to storage, but more problems are needed for storing bag bait than conventional bait. These experiments aim to test whether the bag bait has any repellent effect on fish approaching it. When interpreting the results, however, it must be borne in mind that raw material can be used in bag bait that cannot be used in traditional bait, better utilization of bait raw material is obtained and it is probably best for bag bait to be frozen in the sea. Towards the end of the project, fishing experiments indicated that bag bait yielded similar catches as traditional bait. During the last fishing trip in November 2006, haddock catches were better on bag bait than normal bait, but a flaw in the set-up of the experiment somewhat diminishes the veracity of the result. In addition, vitamin C-fortified bag bait gave slightly more catch than bag bait without vitamin C.

The aim of the project was to develop and produce effective bait for long line fishing from under-utilized raw material using newly developed snow technology that has been patented. The chemical composition of bait raw material and the use of seaweed as an antioxidant in the bait were studied and fishing experiments were done. In connection with the project a baiting machine was designed and produced. Experiments using the machine gave 97% of baited hooks. The use of seaweed as an antioxidant was not successful. The antioxidant activity of the seaweed was probably limited because the bait raw material was already oxidized in the beginning of the storage study. Icing the bait with vitamin C did give some protection although the most important factor seems to be the vacuum packaging. The aim of the fishing experiment was to study the attractiveness of the artificial bait. Most of the fishing experiments were done by studding the artificial bait against the traditional bait using the same raw material. The catch was often less from the artificial bait compared to traditional bait. This can possibly be explained by lower storage stability of the artificial bait due to oxidation. Using artificial bait mainly based on waste from fish processing plants and / or pelagic fish instead of expensive traditional bait material is however promising. The latest fishing experiments showed better results given similar catch for both the artificial and traditional bait. In the last experiment in November 2006 the haddock catch was better for the artificial bait that the traditional bait although it has to be mentioned that the experimental design was incomplete. Artificial bait with vitamin C added gave also better result than the artificial bait without vitamin C.

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