Seasonal Changes in Dry Weight and Biochemical Composition of the Tissues of Sexually Mature and Immature Iceland Scallops, Chlamys Islandica

1981 ◽  
Vol 61 (4) ◽  
pp. 1001-1010 ◽  
Author(s):  
J. H. Sundet ◽  
O. Vahl
Keyword(s):  
Seasonal Changes ◽  
Biochemical Composition ◽  
Dry Weight ◽  
Transitional Zone ◽  
Chlamys Islandica ◽  
Iceland Scallop ◽  
Sexually Mature ◽  
Iceland Scallops

The Iceland scallop (Chlamys islandica) (O. F. Müller) has its main distribution within the subarctic transitional zone where it is found on gravel or sandy bottoms at depths ranging from 10–100 m and usually in places with strong currents (Ekman, 1953; Wiborg, 1962).

scholarly journals Collapse of the fishery for Iceland scallop (Chlamys islandica) in Breidafjordur, West Iceland

2006 ◽  
Vol 64 (2) ◽  
pp. 298-308 ◽  
Author(s):  
Jónas P. Jonasson ◽  
Gudrun Thorarinsdottir ◽  
Hrafnkell Eiriksson ◽  
Jon Solmundsson ◽  
Gudrun Marteinsdottir
Keyword(s):  
Stock Index ◽  
Steady Increase ◽  
Natural Mortality ◽  
Muscle Weight ◽  
Chlamys Islandica ◽  
Poor Recruitment ◽  
Low Levels ◽  
Iceland Scallop ◽  
Fishing Area ◽  
Very High

Abstract Jonasson, J. P., Thorarinsdottir, G., Eiriksson, H., Solmundsson, J., and Marteinsdottir, G. 2007. Collapse of the fishery for Iceland scallop (Chlamys islandica) in Breidafjordur, West Iceland. – ICES Journal of Marine Science, 64: 298–308. The stock index of the Iceland scallop (Chlamys islandica) in Breidafjordur on the west coast of Iceland has declined drastically in recent years. Total fishing mortality was very high throughout the study period from 1993 to 2003, a period characterized by a steady increase in summer sea surface temperature, in 2003 reaching the highest estimated level of the previous century. Between 1998 and 2005, estimates of chlorophyll a (food availability) fluctuated with periods of low chlorophyll followed by a reduction in muscle weight and high natural mortality. High levels of natural mortality were observed in the main fishing area in the southern part of Breidafjordur. There the stock index had been declining since 1994. Recruitment to the fishable stock was highly variable during the study period, with low recruitment towards the end of the 1990s. Subsequently the fishery has been on relatively few year classes, and the stock has been fragile because of several years of poor recruitment and high natural mortality. Consequently, the stock appeared unable to withstand the fishing pressure and declined to historically low levels, leading to a halt to fishing in 2004.

INFLUENCE OF FOLIAR APPLICATION OF NOVATEK SOLUB K-MAX FERTILIZER ON THE BIOCHEMICAL COMPOSITION AND COMMERCIAL AND CONSUMER QUALITIES OF APPLE FRUITS

2021 ◽  
Vol 64 ◽  
pp. 54-60
Author(s):  
D. R.  Useynov ◽  
E. F. Chelebiev ◽  
О. A. Denisova
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Biochemical Composition ◽  
Foliar Application ◽  
Mineral Fertilizer ◽  
Dry Weight ◽  
Water Soluble ◽  
Apple Fruits

The article presents data on the study of the effect of foliar water-soluble mineral fertilizer NOVATEK Solub K-Max 10-5-30 on the biochemical composition and commercial quality of apple fruits. A rise in vitamin C from the introduction of NOVATEK at a rate of 2.5 kg/ha indicates the effectiveness of this drug for optimizing the content of ascorbic acid in fruits. An increase in the content of monosaccharides and a decrease in disaccharides were found for all the studied rates of consumption of agrochemicals. The use of mineral fertilizer “Novatek Solub K-Max” contributed to increase the dry weight of fruits. The application of this mineral fertilizer is recommended for inclusion in the industry regulations for Apple cultivation as one of the elements of the technology. 

ARE BIOENERGETIC PROPERTIES LINKED WITH SHELL FLUCTUATING ASYMMETRY AND HETEROZYGOSITY IN ICELAND SCALLOP,CHLAMYS ISLANDICA?

2007 ◽  
Vol 26 (1) ◽  
pp. 17-23
Author(s):  
ISABELLE TREMBLAY ◽  
MARCEL FRÉCHETTE ◽  
JEAN-MARIE SÉVIGNY ◽  
HELGA E. GUDERLEY
Keyword(s):  
Fluctuating Asymmetry ◽  
Chlamys Islandica ◽  
Iceland Scallop

scholarly journals Factors affecting biochemical composition of seston in an eutrophic reservoir (Pampulha Reservoir, Belo Horizonte, MG

2000 ◽  
Vol 60 (1) ◽  
pp. 63-71 ◽  
Author(s):  
I. G. BOËCHAT ◽  
A. GIANI
Keyword(s):  
Seasonal Changes ◽  
Biochemical Composition ◽  
Abiotic Factors ◽  
Eutrophic Lake ◽  
Phytoplankton Assemblages ◽  
Factors Affecting ◽  
Physical Chemical ◽  
Algal Groups ◽  
Belo Horizonte ◽  
The Relationship

Sestonic biochemical composition (lipids, proteins and carbohydrates) may change with varying environmental fluctuations. These changes and the effects in the nutritional status of algae consists of an actual increasing source of interest. The aims of this work were to establish the relationship between biochemical composition of seston and 1) a range of physical, chemical and climatological factors, and 2) the natural fluctuation in the species composition in phytoplankton assemblages of the Pampulha Reservoir, an urban eutrophic lake located in Belo Horizonte, MG. Seasonal changes in the biochemical composition were observed in this study. None of the considered abiotic factors alone seem to affect the biochemical composition. So the effects could only be understood by interactions among different environmental factors. On the other hand, the dominant algal groups probably have some influence in the observed changes in biochemical composition of seston.

scholarly journals The Jellyfish Rhizostoma pulmo (Cnidaria): Biochemical Composition of Ovaries and Antibacterial Lysozyme-like Activity of the Oocyte Lysate

Marine Drugs ◽  
2018 ◽  
Vol 17 (1) ◽  
pp. 17 ◽  
Author(s):  
Loredana Stabili ◽  
Lucia Rizzo ◽  
Francesco Fanizzi ◽  
Federica Angilè ◽  
Laura Del Coco ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Biochemical Composition ◽  
Saturated Fatty Acids ◽  
Bacterial Overgrowth ◽  
Chemical Characterization ◽  
Dry Weight ◽  
Mature Female ◽  
Bioactive Metabolites ◽  
Negative Consequences ◽  
Positive Effects

Jellyfish outbreaks in marine coastal areas represent an emergent problem worldwide, with negative consequences on human activities and ecosystem functioning. However, potential positive effects of jellyfish biomass proliferation may be envisaged as a natural source of bioactive compounds of pharmaceutical interest. We investigated the biochemical composition of mature female gonads and lysozyme antibacterial activity of oocytes in the Mediterranean barrel jellyfish Rhizostoma pulmo. Chemical characterization was performed by means of multinuclear and multidimensional NMR spectroscopy. The ovaries of R. pulmo were mainly composed of water (93.7 ± 1.9% of wet weight), with organic matter (OM) and dry weight made respectively of proteins (761.76 ± 25.11 µg mg−1 and 45.7 ± 1.5%), lipids (192.17 ± 10.56 µg mg−1 and 9.6 ± 0.6%), and carbohydrates (59.66 ± 2.72 µg mg−1 and 3.7 ± 0.3%). The aqueous extract of R. pulmo gonads contained free amino acids, organic acids, and derivatives; the lipid extract was composed of triglycerides (TG), polyunsaturated fatty acids (PUFAs), diunsaturated fatty acids (DUFAs), monounsaturated fatty acids (MUFAs), saturated fatty acids (SFAs), and minor components such as sterols and phospholipids. The R. pulmo oocyte lysate exhibited an antibacterial lysozyme-like activity (mean diameter of lysis of 9.33 ± 0.32 mm corresponding to 1.21 mg/mL of hen egg-white lysozyme). The occurrence of defense molecules is a crucial mechanism to grant healthy development of mature eggs and fertilized embryos (and the reproductive success of the species) by preventing marine bacterial overgrowth. As a corollary, these results call for future investigations for an exploitation of R. pulmo biomasses as a resource of bioactive metabolites of biotechnological importance including pharmaceuticals and nutrition.

Use of Biochemical Genetic Markers to Discriminate between Adductor Muscles of the Sea Scallop (Placopecten magellanicus) and the Iceland Scallop (Chlamys islandica)

1993 ◽  
Vol 50 (6) ◽  
pp. 1222-1228 ◽  
Author(s):  
E. Kenchington ◽  
K. S. Naidu ◽  
D. L. Roddick ◽  
D. I. Cook ◽  
E. Zouros
Keyword(s):  
Genetic Markers ◽  
18S Rrna Gene ◽  
Rrna Gene ◽  
Placopecten Magellanicus ◽  
Sea Scallop ◽  
Chlamys Islandica ◽  
Adductor Muscles ◽  
Enforcement Programme ◽  
Iceland Scallop ◽  
Species Specific

Three biochemical techniques were applied to adductor muscles of Placopecten magellanicus and Chlamys islandica, two commercially important scallops, to search for species-specific genetic markers. Allozyme electrophoresis identified two enzyme systems, mannose phosphate isomerase and glutamic oxaloacetate transaminase, which appear to be diagnostic. Sequencing of the 18S rRNA gene in each species showed 15 nucleotide differences over 1815 base pairs. Digestion of the gene with the restriction enzyme XHO I released two fragments in Placopecten and three in Chlamys. All three techniques could be developed for management purposes as part of an enforcement programme to identify illegally caught scallops.

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