Time filter

Source Type

Daoud D.,Institute des Sciences de la Mer de Rimouski | Daoud D.,Maurice Lamontagne Institute | Daoud D.,Coastal Zones Research Institute Inc. | Lambert Y.,Maurice Lamontagne Institute | And 2 more authors.
Marine Biology | Year: 2010

Growth of Pandalus borealis post-larval stages was measured in relation to size and temperature. Growth characteristics, including intermolt period (IP), molt increment (MI) in size and mass, and tissue allocation in juvenile, male, and female shrimp, were evaluated at 2, 5, and 8°C, the temperature range where this species is generally found in the Northwest Atlantic. Significant variations in growth were associated with temperature and shrimp size. IP (days) increased significantly with shrimp size and was inversely related to temperature. Size (cephalothorax length in mm) and temperature effects were best described by IP = 10(0.67 log(CL) - 0.06 T - 1. 34). The pronounced effect of temperature on IP while MIS changed little indicated that the main influence of temperature on growth rate of P. borealis was through IP. Specific growth rate (SGRS) decreased rapidly with size to near zero values in females. Overall, juveniles were much more sensitive to temperature variations than adults, suggesting that temperatures encountered during the juvenile stage will largely influence the growth trajectory of the population. © 2010 Her Majesty the Queen in Rights of Canada. Source

Gionet C.,University of Moncton | Gionet C.,Coastal Zones Research Institute Inc. | Mayrand E.,University of Moncton | Landry T.,Northwest Atlantic Fisheries Center
Aquaculture International | Year: 2010

The Mercenaria mercenaria notata line was introduced into the Canadian Atlantic provinces in the late 1990s because of its fast growth rate when compared with that of the current native line. The purpose of this study was to compare the development of two groups of M. mercenaria notata, according to the initial size of the individuals, in order to check whether the current hatchery practice of keeping only the largest larvae may ultimately eliminate the best performing animals. The larvae were raised and sorted by size according to standard hatchery practices. On the tenth day post-fertilization, the two larval size groups were formed. The "initially smaller" (IS) and the "initially larger" (IL) animals were grown separately. Mortality, shell length and energy reserves were measured for both groups at three stages: veliger, post-settling and juvenile. The observed mortality in the two groups was low varying from 8.1 to 19.6%. The IS animals had a higher shell growth rate (18.2 μm/day) when compared to the IL group (12.7 μm/day) with the result that at the end of the experiment, the IS animals were larger than the IL. In both groups, the lipid and protein concentrations diminished rapidly during the veliger stage but faster in the IL group. The glycogen level remained at the limit of detection for all the three stages. The use of energy reserves followed a different pattern according to the group size. This study indicates that culling would have led us to discard the animals which in fact have the best growth potential in that their rate of shell growth is the highest. © 2009 Springer Science+Business Media B.V. Source

Aube M.,Coastal Zones Research Institute Inc. | Quenum M.,Coastal Zones Research Institute Inc. | Ranasinghe L.L.,Theriault and Hachey Peat Moss Ltd.
Mires and Peat | Year: 2015

Sphagnum cultivation on harvested peatlands to meet wetland restoration objectives could be an economically feasible activity since cultivated Sphagnum has potential horticultural applications. We compared the characteristics of cultivated Sphagnum from Shippagan (Canada) with those of non-cultivated Sphagnum products from Chile, New Zealand and Canada, and assessed its potential as a perlite and vermiculite substitute in horticultural peat-based substrates. Shippagan cultivated Sphagnum was shorter than the Chilean and New Zealand products with which it was compared, yet more similar to them than to the Canadian product currently on the market. Laboratory tests on physical properties and greenhouse growth trials indicated that 50–100 % of the perlite or vermiculite of a peat-based substrate can be successfully replaced with cultivated Sphagnum. Non-sieved coarsely shredded Sphagnum or the large (> 6.3 mm) fragments of sieved coarsely shredded Sphagnum best replicated the aeration provided by perlite and vermiculite in the substrates that were tested. Decomposition tests and comparisons of changes in physical properties of substrates containing Sphagnum after six weeks of growth trials indicated that Sphagnum degradation leading to reduced substrate performance is not likely to be an issue. Therefore, cultivated Sphagnum has great potential as a substitute for perlite and vermiculite. © 2015 International Mire Conservation Group and International Peat Society. Source

Jiao G.,Coastal Zones Research Institute Inc. | Jiao G.,National Research Council Canada | Hui J.P.M.,National Research Council Canada | Burton I.W.,National Research Council Canada | And 11 more authors.
Marine Drugs | Year: 2015

Northern shrimp (Pandalus borealis) oil, which is rich in omega-3 fatty acids, was recovered from the cooking water of shrimp processing facilities. The oil contains significant amounts of omega-3 fatty acids in triglyceride form, along with substantial long-chain monounsaturated fatty acids (MUFAs). It also features natural isomeric forms of astaxanthin, a nutritional carotenoid, which gives the oil a brilliant red color. As part of our efforts in developing value added products from waste streams of the seafood processing industry, we present in this paper a comprehensive characterization of the triacylglycerols (TAGs) and astaxanthin esters that predominate in the shrimp oil by using HPLC-HRMS and MS/MS, as well as 13C-NMR. This approach, in combination with FAME analysis, offers direct characterization of fatty acid molecules in their intact forms, including the distribution of regioisomers in TAGs. The information is important for the standardization and quality control, as well as for differentiation of composition features of shrimp oil, which could be sold as an ingredient in health supplements and functional foods. © 2015 by the authors; licensee MDPI. Source

Tripoteau L.,Laboratoire Of Biotechnologie Et Chimie Marines | Tripoteau L.,Coastal Zones Research Institute Inc. | Bedoux G.,Laboratoire Of Biotechnologie Et Chimie Marines | Gagnon J.,Coastal Zones Research Institute Inc. | Bourgougnon N.,Laboratoire Of Biotechnologie Et Chimie Marines
Process Biochemistry | Year: 2015

Herpes Simplex virus 1 (HSV-1), responsible for the common cold sore, can also lead to serious infections in immunocompromised people. Current antiviral chemotherapies face obstacles including the toxicity of therapeutic molecules, interference with normal cellular metabolism, genetic variability and the incurable nature of latent infections. Therefore, the search for new treatments is a public health issue. Marine invertebrates have held great potential for finding novel antiviral compounds. Little is known, about the antiviral activities of compounds isolated from holothurians. In New Brunswick, holothurian is fished for its edible bodywall and muscle, but its processing generates high amounts of byproducts. In vitro evaluation of the anti-HSV-1 activity by cell viability was performed on nine hydrolysates obtained by enzyme-assisted extraction and four solvent extractions from aquapharyngeal bulb and internal organs of Cucumaria frondosa at an MOI of 0.001 ID50/cells. After 72 h, four enzymatic hydrolysates from the aquapharyngeal bulb presented effective antiherpetic activities (EC50 = 7.2-15.2 μg/mL). After evaluation at a higher MOI (0.01 ID50/cells), the most efficient extract (Papain hydrolysate) was fractionated to identify the active fraction. The fraction superior to 100 kDa showed the highest antiherpetic activity (EC50: 18.2 μg/mL). In conclusion, upgrading byproducts of sea cucumber fisheries offers new sources of bioactive molecules. © 2015 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations