103,553 research outputs found
Protein and energy nutrition of marine gadoids, Atlantic cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.)
No full text Primary goals of this thesis were to: 1) examine the in vivo digestion of macronutrients from conventional or alternative feed ingredients used in practical diets of juvenile gadoids (Atlantic cod and haddock), 2) document growth potential of fish at the juvenile grower phase given varying levels of dietary protein and energy and 3) assess the potential of in vitro pH-Stat methods for rapid screening protein quality of feed ingredients, specifically for gadoids. All primary research questions were linked to and built upon one another with the goal of gaining a better understanding of protein and energy utilization of juvenile grower phase gadoids. Studies showed that cod and haddock have a high capacity to utilize a wide range of dietary feed ingredients, such as fish meals, zooplankton meal, soybean products (meal, concentrate and isolate) and wheat gluten meal. New dietary formulations for gadoids may also utilize pulse meals, corn gluten meal, canola protein concentrate and crab meal. Digestibility data in this thesis is currently the only research that examined both in vivo and in vitro macronutrient digestibility of a large number and wide range of individual ingredients, specifically for gadoids. This is essential to gain new knowledge on protein and energy utilization as well as for least-cost ration formulations and effective substitution of ingredients into new formulations. Data has demonstrated a dietary digestible protein/digestible energy (DP/DE)ratio of 30 g DP/MJ DE is required for gadoids during the juvenile phase (in vitro closed-system pH-Stat assay for rapid screening protein quality of test ingredients that is ‘species-specific’ to gadoids. It is demonstrated that in vitro results generally reflected results obtained through conventional in vivo protein digestibility methods. Studies resulted in the first generation of a ‘gadoid-specific’ proteolytic enzyme extraction method and in vitro closed-system pH-Stat assay which may be useful to investigate protein digestion, absorption and metabolism of gadoids and further development of their feeds. </p
The Evolving Research Library: Responsive Organizational Change
No full textCitation: Goetsch, L., Haddock, M., & Stockham, M. (2017). The Evolving Research Library: Responsive Organizational Change. Library Leadership & Management, 31(2).Because of the pace of change in library environments, the organization is continuously evolving and the days of having a structure etched in stone are gone. Kansas State University Libraries engaged in a major organizational restructuring in 2009-2010 and, based on studies and assessments, two smaller but significant changes again in 2015. To assess and redesign the organization, analysis of new and emerging work, staff resources, budget, and space were critical, but the important constant was library users and meeting their needs. This article outlines development of the structural reorganizations, issues encountered during the changes, examples of task force work, lessons learned about process and outcomes, and resulting changes that were made
Round Haddock Landings in Newfoundland: Quantity and Quality Relative to Gutted Haddock
No full text Late in 1953 when large haddock became scarce on the Newfoundland banks, fish plants, which previously had found haddock less than 45 cm. (18 in.) in length to be unacceptable for filleting, began to handle quantities of smaller haddock, 33 to 43 cm. (13 to 17 in.), and generally in an ungutted condition.Determination of the trimethylamine values of fillets from round and gutted haddock showed average values of 0.66 mg. per 100 g. of fillets for round and 0.73 for gutted fish from research vessel and 1.39 for round and 1.61 for gutted from commercial trawlers. These differences were not statistically significant. Using trimethylamine values as indicators of spoilage, round haddock were kept under ice up to 9 days under experimental conditions and produced unspoiled fillets. </jats:p
Inhibition of sexual maturation in tank reared haddock (Melanogrammus aeglefinus) through the use of constant light photoperiods
No full textThe haddock (Melanogrammus aeglefinus) is believed to be a potential candidate for aquaculture in the Atlantic coastal countries including the UK, Norway and Canada. However, under culture conditions, haddock will sexually mature prior to the attainment of a suitable harvest weight. Therefore, a long term tank based experiment was performed where three populations of haddock (hatched spring 2002, approximately 150 fish per population) were exposed to either a simulated natural photoperiod (SNP) or SNP until January or July 2003 and thereafter continuous illumination (Jan LL or July LL respectively) with individual growth rate and maturation status being recorded until July 2004 (27 months post-hatch). While the SNP treated population matured in the spring of 2004 (two years post-hatch) with 88% of the population being observed to release gametes, no mature individuals were observed in either of the LL treated populations and furthermore there was no evidence of gonadal development or elevation in sex steroids (testosterone, estradiol- 17 beta or calcium). The application of LL appeared to directly stimulate the growth rate of haddock (e.g. 14 to 27% increase in weight thermal growth coefficient) and improve food conversion rates. At the end of the trial there was an approximate 50% increase in wet weight (SNP: 647 +/- 53 g, Jan LL: 982 +/- 34 g and July LL 985 +/- 33 g), however no significant difference in weight in relation to the length of LL exposure was observed. Plasma melatonin analysis revealed that the natural diel rhythm had been inhibited in both LL treated populations. Along with highlighting the similarity in reproductive entrainment between haddock and other gadoids, these results demonstrate how photoperiod manipulation could be used as a management strategy to improve growth performanance in farmed haddock stocks. (c) 2007 Elsevier B.V. All rights reserve
Effect of dietary lipid level on fatty acid beta-oxidation and lipid composition in various tissues of haddock, Melanogrammus aeglefinus L
No full textHaddock (Melanogrammus aeglefinus) is a gadoid fish species that deposits dietary lipid mainly in the liver. The fatty acid (FA) beta-oxidation activity of various tissues was evaluated in juvenile haddock fed graded levels of lipid. The catabolism of a radiolabelled FA, [1-(14)C]palmitoyl-CoA, through peroxisomal and mitochondrial beta-oxidation was determined in the liver, red and white muscle of juvenile haddock fed 12, 18 and 24% lipid in the diet. There was no significant increase in the mitochondrial or peroxisomal beta-oxidation activity in the tissues tested as the dietary lipid level increased from 12 to 24%. Peroxisomes accounted for 100% of the beta-oxidation observed in the liver, whereas mitochondrial beta-oxidation dominated in the red (91%) and white muscle (97%) of juvenile haddock. Of the tissues tested, red muscle possessed the highest specific activity for beta-oxidation expressed on a per mg protein or per g wet weight basis. However, white muscle, which forms over 50% of the body mass in gadoid fish was the most important tissue in juvenile haddock for overall FA catabolism. The total lipid and FA composition of these tissues were also determined. This study confirmed that the liver was the major lipid storage organ in haddock. The hepatosomatic index (HSI; 10.0-15.2%) and lipid (73.8-79.3% wet wt.) in the liver increased significantly as dietary lipid was increased from 12 to 24% lipid. There was no significant increase in the lipid composition of the white muscle (0.8% wet wt.), red muscle (1.9% wet wt.) or heart (2.5% wet wt.).LR: 20061115; PUBM: Print; JID: 9516061; 0 (Carbon Radioisotopes); 0 (Dietary Fats); 0 (Fatty Acids); 0 (Lipids); 0 (Lipoproteins, VLDL); 1763-10-6 (Palmitoyl Coenzyme A); ppublishSource type: Electronic(1
Sostenibilità urbana
No full textDefinizione del concetto di sostenibilità urbana; ricostruzione storica dei principali fattori di insostenibilità urbana; quattro approcci sociologici allo studio della sostenibilità urbana; problemi e metodologie appropriate per la ricerca sulla sostenibilità urban
Norwegian investigations on young cod and haddock in the Barents Sea during the winter 1982
No full textAn acoustic survey and a bottom trawl survey were carried out in the Barents Sea during winter 1982. Both surveys showed that there has been a reduction in the total number of cod of about 50% and about 75% for haddock in the area surveyed. This reduction mostly reflect the reduction of fish 6 years and older for cod and 5 years and older for haddock. This is probably due to an early maturing of the 1975 yearclass of cod
and the 1976 yearclass of haddock and a migration to spawning areas south of the area surveyed. For cod 2-4 years old no reduction was observed, and for young haddock the 1979 yearclass was reduced. The investigations indicate that the yearclasses 1977-1980 are very poor for both cod and haddock
Do haddock select habitats to maximize condition?
No full textHaddock Melanogrammus aeglefinus in the North sea increased their distributional range when more abundant, but this density dependent habitat selection (DDHS) explained only a small part of the year-on-year variation in distribution patterns. The condition of haddock was examined at 24 sites in the North Sea in August and September 2004 and related to their abundance, to examine if the ideal free distribution theory (IFD), which assumes that organisms select habitats that maximize their rate of food intake, can be used to explain this variation in large scale distribution patterns. At a given temperature, condition (hepato-somatic index, IH) was better at stations where haddock were most abundant. Therefore, haddock were not distributed perfectly according to the IFD in 2004. The positive correlation between abundance and IH, however, indicated there was some habitat selection by haddock, as in the total absence of habitat selection no correlation between IH and abundance, and no spatial variation in abundance was expected. DDHS may only explain a small part of the yearly variation in the distribution because haddock did not equalize and maximize their fitness at the scale of the North Sea. In addition, stable isotope analysis of muscle samples showed that haddock did not avoid competition for food when at high abundance by feeding at a lower or wider range of trophic levels
Distribution and abundance of 0-group Norway pout and haddock in the North Sea july - august 1978
No full textIn order to assess the 0-group abundance of Norway pout and haddock in the North Sea a combined acoustic/trawl survey was carried out in July - August 1978. The 0-group of both species were concentrated in a scattering layer between surface and 40 m depth during the night. During the day all the 0-group Norway pout and most of the 0-group haddock were found in the vicinity of the bottom but a minor portion of the 0-group haddock occurred in scattered schools throughout the entire water column.
Acoustic estimates of the 0-group stocks of the two species amounted to 165 * 10^9 specimens of Norway pout and 23 * 10^9 specimens of haddock. The figure for Norway pout compares
resonably well with estimates based on independent data, but regarding the haddock the acoustic estimate seems high compared with estimates based on other data sources
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