Reports

Hunting, processing and exporting of live bait king

Published:

06/12/2018

Authors:

Jónas R. Viðarsson, Ásbjörn Jónsson

Supported by:

AVS Fisheries Research Fund (V 11005-11)

Contact

Jónas Rúnar Viðarsson

Director of Business and Development

jonas@matis.is

Hunting, processing and exporting of live bait king

This report outlines the implementation and main results of a research project that took place in the years 2012-2013. The reason for delaying the publication of the final report of the project is that in 2013 the owner of the project, Sægarpur ehf. bankrupt. The project was therefore not completed and has been largely dormant since 2013. However, since most of the project had been completed before Sægarpur went bankrupt, the authors consider it right and obligatory to publicly report here what took place in the project and what the main results are. its were. The aim of the project was to develop fishing, processing, storage and transport of live bait kingfishers, as well as to explore the market for such products. Experiments were carried out with different catch treatments on board a fishing vessel and storage or transport, which gave indications that with the right handling and finishing it would be possible to keep the bait king alive for approx. week. the aim had been to ensure at least 10 days of survival in order for it to be considered realistic to intend to export a live bait king. However, the results of the experiments showed that when more than a week had passed since the hunt, survival decreased rapidly and the meat had become unfit for consumption on the tenth day. It is possible that these processes could be better developed to ensure better survival, but based on these results, the shelf life is not long enough to be considered a viable option at this time. Attempts were also made to keep the bait king alive in a cycle system in a fish tank. The aim of these experiments was to investigate whether it was possible to store live bait king in a "warehouse" for processing on land. A circuit system was equipped with filter equipment that was sufficient to keep the bait king alive for a week. The authors believe that it would be possible to extend the time with more powerful filtering equipment. These results must be considered positive and conducive to the fact that they could be taken up by companies that process bait king. Markets for live bait king were also examined, but it can be said that this survey has finally brought home the truth that the export of live bait king is not a viable option. It is simply a better option to win the bait king here at home. If market conditions change, however, it is not ruled out that processes can be improved to make such exports possible.

This report contains an overview of the progress and main results in a research project that ran in 2012-2013. The reason for the delay in publication of this final report is that the project owner was declared bankrupt in 2013 and the project has been dormant since then. The authors of the report did however feel obligated to make public the progress and main results that were achieved before the owner went out of business. The aim of the project was to develop best practice for catching, handling, packaging, storage and transport of live whelk; as well as studying the markets for live whelk. Experiments were made with different onboard handling, storage and transport of live whelk. These experiments indicated that it should be possible to keep the whelk alive for one week after capture, with correct handling. The goal had however been to ensure that the whelk could be kept alive for at least ten days. Experiments were also made where it was attempted to keep whelk alive in a regular plastic fish-tub equipped with a circulation system. The objective with this was to examine if whelk could be stored, in a relatively simple and inexpensive manner, in-stock for land-based processing. The results indicate that such a system could be used to keep a living inventory of whelk for the processing. The authors of this report are confident that the timeframe could be extended by fitting the system with more efficient filtration equipment. The markets for live whelk were briefly analyzed and the results of that analyzes indicate that export of live whelk from Iceland is not economically feasible or practical. There is simply too little premium paid for live whelk at the moment.

View report

Reports

Use of bioactive substances in halibut farming

Published:

01/12/2007

Authors:

Jónína Þ. Jóhannsdóttir, Heiðdís Smáradóttir, Jennifer Coe, Rut Hermannsdóttir (MS student), María Pétursdóttir, Rannveig Björnsdóttir

Supported by:

Líftækninet HA (2005-2007), KEA University Fund (2006)

Use of bioactive substances in halibut farming

The main goal of the project was to promote the increased performance of halibut in fire and use environmentally friendly methods. Bioactive substances were used that were easy to obtain, contributed to the increased value of seafood and also had some of the desired activity, ie. bactericidal / inhibitory, prebiotic or immunostimulatory activity. Experiments were made with various materials in the project, ie. chitosan derivatives as well as peptides derived from blue whiting, cod and saithe. The effect of treatment with the substances was assessed in terms of the growth and performance of larvae and forage animals as well as in terms of the composition of the bacterial flora and the stimulation of a non-specific immune response in larvae. The main results indicate that the most suitable method for introducing substances into larvae is to use feed animals (Artemia) and a method was developed in the project to treat them. The bioactive substances did not appear to have a bactericidal effect in the rearing environment of the feed animals, but did contribute to a change in the composition of the bacterial flora. Bioactive substances seemed to be used primarily as supplements as feed animals were plump and playful. The performance and quality of larvae in the breeding units of Fiskey hf. is very different and there is no obvious relationship between the performance of the peritoneal stage and the performance and quality of the larvae at the end of the initial feeding. The composition of bacterial flora was also found to be very different in peritoneal larvae and larval feeding larvae. Three separate experiments were carried out in the Fiskey juvenile farm where the larvae in the initial feeding were treated with bioactive substances. The main results showed that it is important to treat with the right concentration of substances and for a reasonably long time as too much concentration can have a negative effect on the growth and metamorphosis of larvae. Treatment with blue whiting peptides was thought to give promising results and have a beneficial effect on larval metastasis. Bioactive substances did not appear to have a decisive effect on the number of bacterial bacteria in the gastrointestinal tract of larvae, but treatment with blue whiting and cod peptides could potentially alter the composition of the flora. Studies on the non-specific immune response of halibut larvae revealed the presence of C3 and Lysozyme from the end of the peritoneal stage, but IgM production does not begin until about 28 days after the start of feeding. Higher levels of IgM were detected during the first weeks in larvae treated with saithe peptides and this may indicate an immunostimulatory effect. The results of the project as a whole indicate that the bioactive substances studied did not have a decisive effect on the bacterial flora of the farm, but the treatment of larvae in starter feeding with the right concentration of bioactive substances could have a good effect on larval performance and stimulate larval immune response. of the farm when they have not yet developed a specialized immune response.

The aim of this project was to promote increased survival of halibut larvae during first feeding by using bioactive products. The bioactive products were selected by the criterion that they were easily accessible and induced any of the desired effects ie inhibiting bacterial growth, prebiotic effects or immunostimulants. The products studied are chitosan and peptide hydrolysates from blue whiting, cod and saithe. The effects of treatment were evaluated with respect to growth and survival of larvae and the live feed (Artemia) as well as effects on bacterial numbers or the community structure of the intestinal microbiota of larvae and stimulation of the innate immune system of the larvae. The results indicate that treating live feed (Artemia) is a suitable method to carry the bioactive products to the larval intestines during first feeding and a new technique has been standardized for treatment of the live feed with the products. The bioactive products did not affect the total bacterial count in the Artemia but the composition of the bacterial community may be changed as a result of the treatment. The Artemia seems to use the bioactive products as a food supplement and was well suited to be used as live feed. A significant variation in overall success of larvae was observed without any obvious correlation between survival of larvae at the end of the yolk sac stage and at the end of first feeding. A different bacterial pattern was observed in the intestine at the yolk sac stage compared to first feeding larvae. Three separate experiments were carried out in the halibut production units at Fiskey Ltd. where larvae were treated with various bioactive products. The results emphasize the importance of treating larvae with the appropriate concentrations of the products, as elevated concentrations can negatively affect growth and metamorphosis of the larvae. Treatment with peptides from blue whiting resulted in relatively good survival of larvae with similar success of metamorphosis compared to control units. The bioactive products did not affect bacterial growth but there were indications that peptides from blue whiting and cod may affect the composition of the intestinal community of bacteria in the larvae. Results from studies of the immunological parameters indicate the presence of C3 and Lysozyme already from the end of the yolk sac stage and the initialization of IgM production after approximately 28 days in feeding. Production of IgM was stimulated in larvae treated with peptides from saithe, indicating immunostimulating effects of this product. The overall results indicate that the bioactive products studied did not affect the bacterial flora during the first production stages of halibut larvae. However, if used in the appropriate quantities and at the right time, the products may promote survival and growth and stimulate the innate immunity of larvae.

View report
EN