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norskBlar i tittel Artikler, rapporter og annet (Norges fiskerihøgskole)
Viser treff 239-258 av 928
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Effect of a quality-improving codend on size selectivity and catch patterns of cod in bottom trawl fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-26)A new codend concept developed and tested exhibited significantly improved quality of caught cod (<i>Gadus morhua</i>) compared to that of the conventional codend used in the Barents Sea bottom trawl fishery. However, the design of the new quality-improving codend raised concerns about its size selectivity and the possibility that higher retention probability could negatively impact the catch pattern ... -
The effect of algae diets (Skeletonema costatum and Rhodomonas baltica) on the biochemical composition and sensory characteristics of Pacific cupped oysters (Crassostrea gigas) during land-based refinement
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-20)<p>Oyster refinement, a common practice in France, is aimed at increasing the weight of oyster tissue and influencing the taste properties of the refined oysters. Refinement usually takes place in land-based systems where the oysters are fed with relatively high concentrations of microalgae. In this study the impact of feeding <i>Skeletonema costatum</i> and <i>Rhodomonas baltica</i> on the biochemical ... -
Effect of an algal amendment on the microbial conversion of coal to methane at different sulfate concentrations from the Powder River Basin, USA
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-29)Biogenic methane is estimated to account for one-fifth of the natural gas worldwide and there is great interest in controlling methane from different sources. Biogenic coalbed methane (CBM) production relies on syntrophic associations between fermentative bacteria and methanogenic archaea to anaerobically degrade recalcitrant coal and produce methanogenic substrates. However, very little is known ... -
Effect of artificial lights on catch efficiency and capture patterns in Asian paddle crab (Charybdis japonica) gillnet fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-22)The gillnet fishery targeting Asian paddle crab (Charybdis japonica) is an important commercial fishery in the Yellow Sea of China. However, low catch rates represent a challenge, and solutions for improving the catch efficiency are crucial for economical sustainability in this fishery. Therefore, we tested whether the use of artificial fishing lights could improve gillnet catch performance. ... -
Effect of Bait Type and Bait Size on Catch Efficiency in the European Hake Merluccius merluccius Longline Fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-02-21)We investigated the effect of bait type and bait size on the catch ef fi ciency of a demersal longline fi shery targeting European Hake Merluccius merluccius in the North Sea. Automation of the labor-intensive processes onboard fi shing vessels requires fi nding alternatives to the traditional bait used in the fi shery (i.e., whole European Pilchard Sardina pilchardus ). Of the six ... -
The Effect of Buffer Towing on Quality Aspects of Frozen and Thawed Atlantic Cod (Gadus Morhua)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-16)A large part of the Northeast Atlantic cod caught with trawls is landed frozen, processed, and sold thawed. Many trawlers have adapted a fishing practice termed ‘buffer towing’, causing probability for poor exsanguination and fillet redness. Here, the effect of buffer towing upon color and hemoglobin concentration in cod loin section is studied, and the development of TVB-N during chilled storage ... -
Effect of chrysophanic acid on immune response and immune genes transcriptomic profile in Catla catla against Aeromonas hydrophila
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-12)The effect of chrysophanic acid (CA) (2, 4, and 8 mg kg<sup>−1</sup>) on the immunity and immune-related gene profile of Catla catla against Aeromonas hydrophila is reported. In both control and treated groups fed with 2 mg kg<sup>−1</sup> (2 CA), the phagocytosis, hemolytic, myeloperoxidase content, and superoxide anion production decreased significantly between 6th and 8th weeks, whereas when fed ... -
The effect of CO2, total ammonia nitrogen and pH on growth of juvenile lumpfish (Cyclopterus lumpus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-12)The objective of this study was to examine the effects of CO<sub>2</sub>, total ammonia nitrogen (TAN: nitrogen bound as either NH<sub>3</sub> or NH<sub>4</sub><sup>+</sup>) and pH on the growth and survival of juvenile lumpfish in a two-month growth study. The results demonstrate the complex interactions of these water quality variables. The specific growth rate (SGR) of the lumpfish was progressively ... -
Effect of Codend Circumference on the Size Selection of Square-Mesh Codends in Trawl Fisheries
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-07-29)It is well established that increasing mesh number in the circumference of a diamond-mesh trawl codend can reduce size selection for round fish, whereas selection for flat fish species is unaffected. This effect has also been documented in Mediterranean trawl fisheries. In contrast, no information is available with regard to the effect of increasing mesh number in the circumference of square-mesh ... -
Effect of Codend Design and Postponed Bleeding on Hemoglobin in Cod Fillets Caught by Bottom Trawl in the Barents Sea Demersal Fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-03)Previous studies have reported that cod caught using a newly developed dual sequential codend showed significant reduction in external catch-related damage compared to cod caught by a conventional codend. In this study, it was investigated whether this new codend affects residual blood in cod fillets and/or mitigates the effect of postponed bleeding. Residual blood was assessed by measuring ... -
Effect of codend mesh sizes on the size selectivity and exploitation pattern of cocktail shrimp (Trachypenaeus curvirostris) in shrimp trawl fishery of the South China Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-29)This study aims at improving fishery management by testing and comparing the size selectivity and exploitation pattern of diamond-mesh codends, with mesh sizes ranging from 25 to 54 mm, for cocktail shrimp (Trachypenaeus curvirostris) in the South China Sea (SCS). Beginning from 25 mm, the minimum mesh size regulated by the shrimp trawl fishery industry, we investigated how the mesh sizes of ... -
Effect of Diet Supplemented With Rapeseed Meal or Hydrolysable Tannins on the Growth, Nutrition, and Intestinal Microbiota in Grass Carp (Ctenopharyngodon idellus)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-25)Grass carp (<i>Ctenopharyngodon idellus; n</i> = 320) were received four different diets for 56 days. The experimental diets were: fishmeal (FM) containing 10% fishmeal (without rapeseed meal), and rapeseed meal (RM) containing 50% rapeseed meal (without fishmeal), and two semi-purified diets either without (T0) or with 1.25% (T1) supplemental hydrolysable tannin. The approximate content of tannin ... -
Effect of dietary components on the gut microbiota of aquatic animals. A never-ending story?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-07)It is well known that healthy gut microbiota is essential to promote host health and well-being. The intestinal microbiota of endothermic animals as well as fish are classified as autochthonous or indigenous, when they are able to colonize the host’s epithelial surface or are associated with the microvilli, or as allochthonous or transient (associated with digesta or are present in the lumen). ... -
Effect of Extension Piece Design on Catch Patterns in a Mediterranean Bottom Trawl Fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-18)The catch composition of bottom trawls is commonly refined and improved through changes in codend design. Measures like reducing the number of meshes in codend circumference or turning diamond netting by 90 degrees are well known to improve the size selectivity of fish species with rounded cross-sectional shape. Based on this we speculated whether the same measures, if applied in other parts of ... -
Effect of gear design on catch damage on cod (Gadus morhua) in the Barents Sea demersal trawl fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-18)Damage incurred during the catch process is an indicator of the overall quality of fish and fish welfare. Because catch quality is difficult to improve once it has deteriorated, it is important to preserve quality during the catch process. Atlantic cod (<i>Gadus morhua</i>) is the most important species in the Barents Sea bottom trawl fishery. Bottom trawling is a non-benign fishing method, and it ... -
Effect of gillnet twine thickness on capture pattern and efficiency in the Northeast-Arctic cod (Gadus morhua) fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-15)Gillnets are among the most common fishing gears worldwide. They are often made of thin twine, which is prone to wear and tear, limiting the lifespan of the gillnet. This increases gillnet turnover, and consequently increased risk of gear discarding, gear loss, ghost fishing and marine pollution. This might be mitigated by increasing twine thickness, and thereby breaking strength. However, the ... -
Effect of grid section design on trawl size selectivity
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-12)Sorting grids are introduced in trawl fisheries to improve size selectivity and reduce the variability of results obtained with sorting devices constructed of netting e.g., codends. Grids are rigid or semi-rigid structures where the bar spacing defines the sizes of fish that can pass through. However, for size selection to occur, fish need to be oriented towards the grid in specific ways, which ... -
Effect of ground gear modification on bycatch of rays in mediterranean bottom trawl fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-28)Bycatch of rays and skates in towed fishing gears represents one of the major threats to these relatively slow-growing marine species. The objective of this study was to modify ground gear in a bottom trawl fishery to increase the escape of these species during towing without associated loss of target catch. Sea trials were carried out with a research vessel in Mersin Bay, North-eastern Mediterranean. ... -
The Effect of Gut Microbiota and Probiotics on Metabolism in Fish and Shrimp
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-03)The present paper presents an overview of the effects of gut microbiota and probiotics on lipid-, carbohydrate-, protein- and amino acid metabolism in fish and shrimp. In probiotic fish studies, the zebrafish (Danio rerio) model is the most frequently used, and probiotic administration reveals the effect on glucose homeostasis, anti-lipidemic effects and increasing short-chain fatty acids, and ... -
Effect of Hook and Bait Size on Catch Efficiency in the Persian Gulf Recreational Fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-15)The effect of hook and bait sizes on the catch efficiency and size composition of Spangled Emperor <i>Lethrinus nebulosus</i>, Orange‐spotted Grouper <i>Epinephelus coioides</i>, and Narrowbarred Mackerel <i>Scomberomorus commerson</i> was investigated in the recreational and semi‐subsistence handline fishery in the Persian Gulf. Based on expectations that increasing hook and bait sizes would decrease ...
