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  • Articles  (200)
  • Lipids
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  • 1
    Publication Date: 2021-05-19
    Description: Quality grading and nutrition value determination of fish are nowadays necessary for aquatic processing. The present study was conducted to investigate a new, applied and cheap method of fillet quality grading for common carp (Cyprinus carpio) using fish size, based on mathematical equations. For this reason, 61 specimens of cultured market size carp were used and after filleting, their moisture, lipid, protein, energy and ash content were measured. Then, the relationships between proximate composition components of fillet and fillet length were studied. Results showed that there is an inverse linear regression relationship between logarithm of moisture content and logarithm of fish length (P〈0.05). The results also showed that there is a positive linear regression relationship between logarithm of lipid and energy content and logarithm of fish length (P〈0.05). No significant relationship was found between logarithm of fillet protein and ash content and logarithm of fish length (P〉0.05). Regarding the relationship between proximate composition of cultured carp fillets and fillet length machine fish sorting based on fish length and grading of moisture, lipid and energy content is feasible. We also found it feasible to determine type of processing and proximate composition of the prepared common carp.
    Description: Published
    Keywords: Processing fishery products ; Ash content ; Fish fillets ; Fish culture ; Cyprinus carpio ; Moisture ; Mathematical models ; Filletting ; Lipids ; Freshwater fish ; Nutrition ; Grading ; Energy ; Proteins ; Fish ; Seafood ; Size ; Freshwater
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.27-38
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  • 2
    Publication Date: 2021-05-19
    Description: Total lipids, fatty acid composition and heavy metal content of Sardina pilchardus fillet samples captured in February 2014 in Beni saf, Mostaganem, Ghazaouet, Algiers and Jijet coast were evaluated. Total lipid content was related to the five sites of catch (p〈0.05), ranging from 7.18 g 100g-1 for Algiers to 10.07g 100g-1 for Beni saf. The fatty acid composition of S. pilchardus shows a high content of polyunsaturated fatty acids (PUFAs) dominated by n-3 fatty acids eicosapentaenoic acid (EPA C20:5 n-3) and docosahexaenoic acid (DHA C22:6n-3) with maximum rates of 15.75% and 33.42%, respectively (p〈0.05). The saturated fatty acid (SFA) content was important in different samples of sardines, ranging from 35.50% to 41.32% according to sites of capture (p〈 0.05). Concerning the heavy metals, the levels of lead (Pb) ranged from 0.013mg to 0.024mg, however those of mercury (Hg) varied from 0.080 mg to 0.130 mg (p〈0.05), which affects the health value of the fish species.
    Description: Published
    Keywords: Sardina pilchardus ; Fatty acids ; Lipids ; Heavy metals
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1021-1029
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  • 3
    Publication Date: 2021-05-19
    Description: This project was carried out to increase shelf life of kilka and prevent color changes during cold storage. Edible film made by sodium alginate (0.5% concentration) was used for fish packaging at time zero. The covered samples were kept at -18oC. Examination were carried out for a period of six months. Coliform, Escherichia coli and Pseudomonas bacteria contamination were negative until the end of storage period in the covered samples. Total bacterial counts and Acetaphylococcus bacteria count were lower in the treated samples (2.93 and 1.46log cfu/g, respectively) compared with the control specimens (3.21 and 2.28log cfu/g, respectively). Chemical factors consisting of humidity, protein, lipid, ash and calorie were higher in the treated samples (73.34%, 18.96%, 4.62%, 2.88% and 134. 63% kcal/kg, respectively) compared with the control samples (59.43%, 18.04%, 4.03%, 2.87% and 108.43% kcal/kg, respectively) and fresh fish samples (73.93%, 18.91%, 4.59%, 2.87% and 117.28% kcal/kg, respectively). Free fatty acids (0.77 and 9.21g/100), thiobarbitoric acid (0.001 and 0.15mg/kg), peroxide value (0.06 and 3.75meq/kg oil), TVN (6.92 and 16.28mg/100g) and pH (6.34 and 6.91) were lower in the treated samples compared with the control samples. However, no statistically significant decreases were observed in chemical factors including moisture, peroxide value, TVN and pH in the covered samples compared with the control samples during cold storage (P〉0.05). According to the statistical analyses of sensory specifications including taste, odor, color, tissue and total acceptance, there was a significant difference between the covered samples and the control ones (P〈0.05). Using the results of bacterial, chemical and sensory tests and statistical analyses, the covered samples had a favorable quality until the end of storage period. Also, based on the results of sensory analyses and moisture test, the control samples had a favorable quality for a period of three months.
    Description: Published
    Keywords: Colour ; Storage conditions ; Packing fishery products ; Escherichia coli ; Acetaphylococcus ; Brackish ; Tissues ; Chemical composition ; Lipids ; Storage life ; Proteins ; Humidity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.61-76
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  • 4
    Publication Date: 2021-05-19
    Description: La boutargue est constituée par les ovaires salés et séchés des mulets à grosse tête (Mugil cephalus) et de la courbine (Argyrosomus regius) représente une ressource importante pour la région de Nouakchott et pour la Mauritanie. Pour déterminer la valeur énergétique dans les boutargues, nous avons effectué des dosages des protéines, des glucides, des lipides et des études analytiques des acides gras et des lipides. Les analyses ont révélé que la boutargue contient, par rapport aux autres éléments d’énergie, très peu de glucide : 3,29% dans la boutargue du mulet et 1,95% dans celle de la courbine. Alors que les teneurs en protéines et lipides sont importantes et sont respectivement de 44,44% et 31,68% dans la boutargue du mulet et de 55,11% et 15,86% dans celle de la courbine. La boutargue est d’une grande valeur nutritionnelle. En effet, la boutargue du mulet contient 493,82 kcal/100g, alors que celle de la courbine contient 384,27 kcal/100g. En outre, chaque gramme de boutargue du mulet contient 28,1mg d’acides gras, tandis que celle de la courbine contient 19,7mg. Les acides gras trouvés dans les boutargues étudiées sont subdivisés en 3 groupes: - Les acides gras saturés : 17,9% dans la boutargue du mulet et 1,8% dans celle de la courbine, - Les acides gras monoinsaturés : 39,4% dans la boutargue du mulet et 40,65% dans celle de la courbine, - Les acides gras polyinsaturés : 28,8% pour la boutargue du mulet et 35,89 % dans celle de la courbine. La quantité lipidique du mulet est supérieure à celle de la courbine, mais la quantité de protéine est inférieure. Le taux d’énergie de la boutargue du mulet est supérieur à celui de la courbine. Néanmoins, cette dernière contient plus d’acides gras mono et poly insaturés que celle du mulet.
    Description: تمثل البطارخ، مبايض سمك البوري (Mugil cephalus) والكوربين (Argyrosomus regius) المملحة و المجففة، ثروة هامة لمنطقة نواكشوط ولموريتانيا. لمعرفة مقدار الطاقة في هذه البطارخ، قمنا بدراسة كمية لمكوناتها الطاقية : الدهنيات والبروتينات و السكريات و كيفية للدهنيات. بينت هذه الدراسة أن البطارخ تحتوي على نسب ضئيلة من السكريات. ففي بطارخ الكوربين لاتتجاوز 1,95 % و3,29 %في بطارخ البوري. في هذه الأخيرة ترتفع نسبتي البروتينات و الدهنيات إلى 44,44 % و31,68 % بينما في بطارخ الكوربين تصل هاتين النسبتين إلى%55,11 و15,86 %. كما تبين أن البطارخ غنية بالطاقة حيث توجد بها 493,80 كيلوكالوري/100غ في بطارخ البوري و 384,27 كيلوكالوري/100غ في بطارح الكوربين وكل غرام من بطارخ البوري تحتوي على 28,1 ملغ أحماض دهنية و19,7 أحماض دهنية ببطارخ الكوربين . تنقسم هذه الأحماض إلى ثلاث مجموعات أساسية مختلفة كما وكيفا وهي: - الأحماض الدهنية المشبعة17,9 : % ببطارخ البوري و1,8 % ببطارخ الكوربين. - الأحماض الدهنية أحادية عدم التشبع : % 39,4 ببطارخ البوري و 40,65 % ببطارخ الكوربين. - الأحماض الدهنية متعددة عدم التشبع : 28,8 % ببطارخ البوري و35,89 % ببطارخ الكوربين. نستنتج أن كمية الدهنيات ببطارخ البوري أكثر من نظيرتها بالكوربين، بينما نرى العكس بالنسبة لكمية البروتينات حيث نرى أنها أكثر ببطارخ الكوربين أما كمية الطاقة فتبدو أعلى ببطارخ البوري من بطارخ الكوربين كما تحتوي هذه الأخيرة على أحسن نوعية للدهنيات.
    Description: The boutargue is consisted of salted and dried ovaries of the mullet (Mugil cephalus) and black umber (Argyrosomus regius) is an important resource for the region of Nouakchott and Mauritania. In order to determine the energetic value of the boutargue, we measured the proteins, the carbohydrates and the lipids contents, in addition to the analytical studies of the fatty acids. These experiments revealed that the boutargue contains very low carbohydrate levels: 3,29% for the mullet and 1,95% for the black umber. The protein and the lipid contents were 44,44% and 31,68% respectively for the mullet while, they were respectively 55,11% and 15,86% for the black umber. This study showed the good nutritional quality of boutargue. In fact, the boutargue of the mullet contains 493,82kcal/100g, where as that of the black umber contains 384,27kcal/100g. Each gram of boutargue of the mullet contains 28,1mg of fatty acids and while that of the black umber contain 19,7mg of fatty acids. The fatty acids found in the studied boutargues were subdivided in three groups: - Saturated fatty acids: 17,9% for the mullet and 1,8% for the black umber, - Unsaturated mono fatty acids: 39,4% for the mullet and 40,65% for the black umber, - Polyunsaturated fatty acids: 28,8% for the mullet and 35,89 % for the black umber, As compared to the black umber's boutargue, the mullet boutargue contains high lipid quantity. Where as, the quantity of protein in the black umber’s boutargue was higher as compared to the mullet's boutargue. The energetic rate of the mullet boutargue is higher than that of the black umber. But the black umber boutargue contains more polyunsaturated and unsaturated mono fatty acids.
    Description: Published
    Description: Argyrosomus regius, Mugil cephalus
    Keywords: Carbohydrates ; Chemical composition ; Fatty acids ; Nutritive value ; Ovaries ; Argyrosomus regius ; Lipids ; Proteins ; Carbohydrates ; Chemical composition ; Fatty acids ; Food fish ; Lipids ; Nutritive value ; Ovaries ; Proteins
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 5
    Publication Date: 2021-05-19
    Description: : تمثل البطارخ، مبايض سمك البوري (Mugil cephalus) والكوربين (Argyrosomus regius) المملحة و المجففة، ثروة هامة لمنطقة نواكشوط ولموريتانيا. لمعرفة مقدار الطاقة في هذه البطارخ، قمنا بدراسة كمية لمكوناتها الطاقية : الدهنيات والبروتينات و السكريات و كيفية للدهنيات. بينت هذه الدراسة أن البطارخ تحتوي على نسب ضئيلة من السكريات. ففي بطارخ الكوربين لاتتجاوز 1,95 % و3,29 %في بطارخ البوري. في هذه الأخيرة ترتفع نسبتي البروتينات و الدهنيات إلى 44,44 % و31,68 % بينما في بطارخ الكوربين تصل هاتين النسبتين إلى%55,11 و15,86 %. كما تبين أن البطارخ غنية بالطاقة حيث توجد بها 493,80 كيلوكالوري/100غ في بطارخ البوري و 384,27 كيلوكالوري/100غ في بطارح الكوربين وكل غرام من بطارخ البوري تحتوي على 28,1 ملغ أحماض دهنية و19,7 أحماض دهنية ببطارخ الكوربين . تنقسم هذه الأحماض إلى ثلاث مجموعات أساسية مختلفة كما وكيفا وهي: - الأحماض الدهنية المشبعة17,9 : % ببطارخ البوري و1,8 % ببطارخ الكوربين. - الأحماض الدهنية أحادية عدم التشبع : % 39,4 ببطارخ البوري و 40,65 % ببطارخ الكوربين. - الأحماض الدهنية متعددة عدم التشبع : 28,8 % ببطارخ البوري و35,89 % ببطارخ الكوربين. نستنتج أن كمية الدهنيات ببطارخ البوري أكثر من نظيرتها بالكوربين، بينما نرى العكس بالنسبة لكمية البروتينات حيث نرى أنها أكثر ببطارخ الكوربين أما كمية الطاقة فتبدو أعلى ببطارخ البوري من بطارخ الكوربين كما تحتوي هذه الأخيرة على أحسن نوع
    Description: La boutargue est constituée par les ovaires salés et séchés des mulets à grosse tête (Mugil cephalus) et de la courbine (Argyrosomus regius) représente une ressource importante pour la région de Nouakchott et pour la Mauritanie. Pour déterminer la valeur énergétique dans les boutargues, nous avons effectué des dosages des protéines, des glucides, des lipides et des études analytiques des acides gras et des lipides. Les analyses ont révélé que la boutargue contient, par rapport aux autres éléments d’énergie, très peu de glucide : 3,29% dans la boutargue du mulet et 1,95% dans celle de la courbine. Alors que les teneurs en protéines et lipides sont importantes et sont respectivement de 44,44% et 31,68% dans la boutargue du mulet et de 55,11% et 15,86% dans celle de la courbine. La boutargue est d’une grande valeur nutritionnelle. En effet, la boutargue du mulet contient 493,82 kcal/100g, alors que celle de la courbine contient 384,27 kcal/100g. En outre, chaque gramme de boutargue du mulet contient 28,1mg d’acides gras, tandis que celle de la courbine contient 19,7mg. Les acides gras trouvés dans les boutargues étudiées sont subdivisés en 3 groupes: - Les acides gras saturés : 17,9% dans la boutargue du mulet et 1,8% dans celle de la courbine, - Les acides gras monoinsaturés : 39,4% dans la boutargue du mulet et 40,65% dans celle de la courbine, - Les acides gras polyinsaturés : 28,8% pour la boutargue du mulet et 35,89 % dans celle de la courbine. La quantité lipidique du mulet est supérieure à celle de la courbine, mais la quantité de protéine est inférieure. Le taux d’énergie de la boutargue du mulet est supérieur à celui de la courbine. Néanmoins, cette dernière contient plus d’acides gras mono et poly insaturés que celle du mulet.
    Description: The boutargue is consisted of salted and dried ovaries of the mullet (Mugil cephalus) and black umber (Argyrosomus regius) is an important resource for the region of Nouakchott and Mauritania. In order to determine the energetic value of the boutargue, we measured the proteins, the carbohydrates and the lipids contents, in addition to the analytical studies of the fatty acids. These experiments revealed that the boutargue contains very low carbohydrate levels: 3,29% for the mullet and 1,95% for the black umber. The protein and the lipid contents were 44,44% and 31,68% respectively for the mullet while, they were respectively 55,11% and 15,86% for the black umber. This study showed the good nutritional quality of boutargue. In fact, the boutargue of the mullet contains 493,82kcal/100g, where as that of the black umber contains 384,27kcal/100g. Each gram of boutargue of the mullet contains 28,1mg of fatty acids and while that of the black umber contain 19,7mg of fatty acids. The fatty acids found in the studied boutargues were subdivided in three groups: - Saturated fatty acids: 17,9% for the mullet and 1,8% for the black umber, - Unsaturated mono fatty acids: 39,4% for the mullet and 40,65% for the black umber, - Polyunsaturated fatty acids: 28,8% for the mullet and 35,89 % for the black umber, As compared to the black umber's boutargue, the mullet boutargue contains high lipid quantity. Where as, the quantity of protein in the black umber’s boutargue was higher as compared to the mullet's boutargue. The energetic rate of the mullet boutargue is higher than that of the black umber. But the black umber boutargue contains more polyunsaturated and unsaturated mono fatty acids.
    Description: Published
    Description: Mugilcephalus, argyosomus regius, boutargue, mulet, courbine, glucides, protéines, lipides, acides gras, Mauritanie.
    Keywords: Chemical composition ; Fatty acids ; Carbohydrates ; Nutritive value ; Proteins ; Lipids ; Chemical composition ; Proteins ; Lipids ; Fatty acids ; Carbohydrates ; Food fish ; Nutritive value
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 315500 bytes
    Format: application/pdf
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  • 6
    Publication Date: 2021-05-19
    Description: لدراسة تأثير عملية تحويل سمك السردين واللاطشة إلى المعلبات على الجودة الغذائية، قمنا بمتابعة موشرات جودة الدهنيات و تركيبتها من الأحماض الدهنية و أثبتت النتائج أن تغيرات كمية و جودة الدهنيات متعلقة أساسا بتركيبة سمك السردين أو اللاطشة الطازج بالدهنيات و بتركيبة المادة الحافظة (زيت الزيتون أو الطماطم). كما أثبتت التحاليل بواسطة الكروماتوغرافيا ذات الطور الغازي ثراء المعلبات بالأحماض الدهنية التالية C18 :1 ω9 وC18 :2 ω6 . وأخيرا، يمكننا التأكيد أن سمك السردين واللاطشة المعلب بزيت الزيتون و الطماطم غني بالأحماض الدهنية من عائلتيωω3 وω6 .
    Description: The effects of cooking and sterilisation steps on muscle lipid deterioration of Sardinella aurita and Sardina pilchardus canned in olive oil and tomato sauce respectively were investigated. Lipid contents of Sardinella aurita flesh were significantly affected (p 〈 0.05) by the canning process. However, lipid levels of Sardina pilchardus remained constant during processing. The peroxide value and thiobarbituric index increased slightly after the cooking step but changed significantly (p 〈 0.05) following canning. Both canned sardine and sardinella absorbed coating-oil during sterilisation inducing a higher oleic (C18:1 n-9) and linoleic (C18:2 n-6) acids content. Independently of coating-oil category, the eicosapentaenoic (C20:5 n-3) and docosahexaenoic (C22:6 n-3) acids concentrations ranged from 3.00 to 6.24% and from 5.12% to 40.26% respectively. Although, lipids of Sardinella aurita and Sardina pilchardus were slightly affected by the canning process, and they remain a good source of ω3 and ω6 fatty acids.
    Description: Dans le présent travail, les effets de la cuisson et de la stérilisation sur la qualité et la composition en acide gras des lipides de la sardinelle Sardinella aurita et la sardine Sardina pilchardus au cours de la mise en boite dans l’huile d’olive et la sauce de tomate ont été étudiés. La teneur en lipides dans la chair de la sardinelle Sardinella aurita a augmenté significativement (p 〈0.05) après la mise en boite. Cependant, celle de la sardine Sardina pilchardus a demeuré stable dans les mêmes conditions. D’autre part, l’étude des indicateurs d’altération des lipides nous a montré que la qualité des lipides de la sardine est affectée par la stérilisation mais pas par la cuisson. La composition en acides gras de la sardine et la sardinelle en boite de conserve change significativement après stérilisation. En effet, indépendamment de la nature d’huile conservatrice, les lipides de la matière première s’enrichissent en acide oléique (C18:1 n-9) et linoléique (C18:2 n-6). Les lipides de la sardine et la sardinelle en boite représentent une source en acides gras poly insaturés de la familles des ω3 et ω6. Mots clés: Mise en boite; Sardinella aurita; Sardina pilchardus; huile d’olive; Sauce tomate; Acide gras
    Description: Published
    Keywords: Sardina pilchardus ; Sardinella aurita ; Oxidation ; Canning ; Lipids ; Polyunsaturated fatty acids ; Canning ; Lipids ; Oxidation ; Polyunsaturated fatty acids ; Processing fishery products ; Quality control
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 7
    Publication Date: 2021-05-19
    Description: L'influence du pH du milieu sur la composition en acides gras de Brachionus plicatilis a ete etudiee en ajustant le pH de cultures semi-continues de rotiferes. Deux groupes ont ete soumis a un pH variant entre 5 et 6, deux autres entre 9 et 10, les deux temoins (pH non modifie) ayant un pH variant de 7 a 8. Les rotiferes ont ete nourris avec un aliment a base de levure de boulangerie et d'huile emulsifiee. Les rotiferes ainsi produits ont ete analyses apres 10 jours de traitement. La teneur en lipides ne varie pas de facon significative. Une nette influence du pH est remarquee sur la composition en acides gras et notamment sur les acides gras longs polyinsatures de la serie n-3 dont les teneurs sont plus importantes a pH acide et surtout basique qu'a pH neutre. Ceci s'effectue au detriment des acides gras de la serie n-7. La difference la plus remarquable concerne l'acide docosahexaenoique (C22:6n-3), maximale a pH basique. La manipulation du pH des cultures peut donc etre une technique permettant d'ameliorer la teneur des rotiferes en acides gras essentiels afin de couvrir les besoins des larves de poissons marins.
    Description: The influence of pH of rotifer culture medium on the fatty acid content of rotifers was studied. The pH of rotifer semi-continuous cultures was daily adjusted either at pH 5 to 6, either at pH 9 to 10, while the pH of the untreated control group varied from 7 to 8. Rotifers were fed with a mixture of baker's yeast and emulsified oil. After 10 days, rotifer fatty acid composition of each tank was analysed. Total lipid content did not change between treatments. A clear pH influence was noticed on Long Chain Polyunsaturated n-3 fatty acids content at the expense of the n-7 monounsaturated fatty acids. The acid and mainly basic treatments led to higher levels of n-3 highly unsaturated fatty acids in rotifers than neutral pH. The main difference concerned docosahexaenoic acid (C22:6n-3) with the highest value observed in rotifers cultures at alcaline pH. pH monitoring of the cultures can be a means to improve rotifer quality in their essential fatty acid content and in order to meet requirements of marine fish larvae
    Description: Published
    Keywords: Lipides ; Acides gras ; Proies vivantes ; Rotifères ; Feeding ; Food organisms ; Nutritive value ; Lipids ; Crustacean culture ; Fatty acids ; Fish larvae ; Fish culture ; pH ; Brachionus plicatilis ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.103-112
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  • 8
    Publication Date: 2021-05-19
    Description: The biochemical composition and energy content of muscle, liver and gonads of Merluccius hubbsi females during the reproductive cycle were assessed. Adult females (44-50 cm total length) were caught in the Patagonian area (43~' S-45~' S). Condition factor (K) and hepatosomatic index (HSI) were estimated. Proteins and lipids in each tissue were determined. Besides, water and ashes content in muscle was analyzed. In all tissues the biochemical components underwent variations during the reproductive cycle. During the process gonads showed a significant drop in protein and lipid content (P 〈 0.01). In muscle, a decrease in proteins (P 〈 0.01) and lipids in the postspawning period was observed; the percentage of both components increased during the resting stage. The same pattern was verified in the liver. The energy content was lower in the postspawning stage (P 〈 0.05). A positive relation of K with lipids of muscle and liver and of HSI with lipids and proteins of liver and lipids of muscle was observed. The decrease of lipids and proteins during the postspawning stage would reflect an important energy output during the reproductive cycle.
    Description: Se evaluó la composición bioquímica y el contenido energético del músculo, hígado y gónadas de hembras de Merluccius hubbsi durante el ciclo reproductivo. Las hembras adultas (44-50 cm de longitud total) se capturaron en la región norpatagónica (43~' S-45~' S). Se estimó el factor de condición de Fulton (K) y el índice hepatosomático (IHS). Se determinaron las proteínas y los lípidos de cada tejido. Se analizó, además, el contenido de humedad y cenizas en músculo. En todos los tejidos los componentes bioquímicos mostraron variaciones en el ciclo reproductivo. Durante el proceso las gónadas presentaron una caída significativa del contenido de proteínas y lípidos (p 〈 0,01). En músculo se constató una disminución de proteínas (p 〈 0,01) y lípidos en la fase de postdesove; el porcentaje de ambos componentes aumentó en el estadio de reposo. El mismo patrón se observó en el hígado. El contenido energético fue menor en el estadio de postdesove (p 〈 0,05). Se constató una relación positiva de K con lípidos del músculo e hígado y de IHS con lípidos y proteínas del hígado y lípidos del músculo. La disminución de lípidos y proteínas durante el estadio de postdesove sería el reflejo de un importante gasto energético durante el ciclo reproductivo.
    Description: Published
    Description: composición química
    Description: ciclo reproductivo
    Description: proteínas
    Description: lípidos
    Description: Merlucciidae
    Description: Merluccius hubbsi
    Description: merluza
    Keywords: Merluccius hubbsi ; PSW, Argentina ; marine environment ; Chemical composition ; Reproductive cycle ; Proteins ; Lipids
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: issue:21 p.5-19
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  • 9
    Publication Date: 2021-05-19
    Description: Se presentan los resultados de las investigaciones realizadas por más de veinte años por el Centro de Investigaciones Marinas de la Universidad de La Habana en la nutrición del camarón blanco Litopenaeus schmitti, donde se estudiaron diferentes aspectos de los requerimientos nutricionales, enzimas digestivas, aditivos, dietas para la larvicultura y la maduración así como ingredientes empleados en la formulación del alimento, que aportaron una información fundamental para el cultivo de esta especie y que permiten incrementar los conocimientos nutricionales de los camarones peneidos.
    Description: The results of the investigations accomplished for over 20 years by the Center of Marine Research of the Havana University in the nutrition of the white shrimp Litopenaeus schmitti, are shown. Were studied different aspects of the nutritional requirements, digestive enzymes, additives, diets for the larviculture and the maturation as well as ingredients used in the formulation of the foods, that they contributed a fundamental piece of information for the culture of this species and that they allow increase the nutrition knowledge of the shrimps penaeid.
    Description: Published
    Keywords: Additive ; Digestive enzymes ; Lipids ; Litopenaeus schmitti ; Nutrition ; Proteins ; Special diets white shrimp ; Aditivos ; Camarón blanco ; Dietas especiales ; Enzimas digestivas ; Lípidos ; Litopenaeus schmitti ; Nutrición ; Proteínas
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp.24-40
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  • 10
    Publication Date: 2021-05-19
    Description: El cultivo de peces marinos ha atraído considerable atención en la última década, experimentando un gran auge en años recientes. Esto se debe principalmente al desarrollo y optimización de la tecnología de cultivo en jaulas, como también al mejoramiento de las técnicas de producción de juveniles, lo que ha incrementado el número de especies para las cuales existen cultivos de orientación comercial. En las circunstancias actuales, para que el cultivo de peces sea rentable es necesario controlar todas las fases del ciclo vital de la especie. En el presente trabajo se abordó esta problemática a través de estudios enfocados a la maduración gonadal y desove a través de tratamientos de temperatura y fotoperíodo denominados no invasivos. En el primer experimento se analizaron los parámetros ambientales de temperatura y fotoperíodo necesarios para que se efectue la maduración gonadal y el posterior desove del pargo amarillo Lutjanus argentiventris. Se estableció un rango de temperatura entre los 26 oC y 29 oC con fotoperíodos entre 14 y 16 horas de luz al día como las condiciones ambientales más apropiadas para motivar la maduración y desove de esta especie. Se observó un porcentaje de fertilización en los desoves obtenidos menor al 35 %. No se observaron diferencias significativas de los desoves obtenidos en la viabilidad, fertilización y eclosión de los mismos, entre los tratamientos evaluados. En un segundo experimento, se analizó la interrelación de los parámetros ambientales de temperatura y fotoperíodo y los desoves. Se comprobó que la ocurrencia de los desoves está correlacionada positivamente con las variables ambientales, sin embargo, constatamos que la temperatura tiene un efecto mayor en el proceso de maduración del pargo amarillo. El análisis de los ovarios del Lutjanus argentiventris reveló una organización funcional del ovario de tipo asincrónico, el establecimiento de 7 estadios de maduración gonadal y en forma separada las oogonias, que dividimos en dos fases de desarrollo: en la primera fase hay un período de crecimiento lento y largo que denominamos en el organismo como inmaduro, en esta fase localizamos las oogonias, el estadio I, ovocito peri-núcleo temprano y el estadio II, ovocito peri-núcleo tardío. La segunda fase es un periodo corto en donde los ovocitos crecen y maduran rápidamente para posteriormente ser desovados. En esta fase localizamos el estadio III, ovocito alvéolo cortical, el estadio IV, ovocito en vitelogénesis temprana, el estadio V, ovocito en vitelogénesis tardía, el estadio VI, ovocito en migración de vesícula germinal y el estadio VII, ovocito hidratado ó en maduración final. En los análisis bioquímicos realizados se evaluó el contenido de lípidos totales, triglicéridos y colesterol en los ovarios de organismos silvestres y domésticos. No se encontraron diferencias significativas en el contenido de lípidos totales y triglicéridos, pero si hubo diferencias en el contenido de colesterol entre los ovarios de organismos silvestres y domésticos. Se comparó el contenido de lípidos de los ovocitos en vitelogénesis tardía entre los ovarios de los organismos domésticos y silvestres mediante técnicas histoquímicas, en los cuales se encontraron diferencias significativas, mostrando una disminución del vitelo en los ovocitos de las hembras que han sido sometidas a un ciclo con múltiples desoves. No se encontraron diferencias significativas en el contenido de lípidos totales, colesterol y triglicéridos entre los huevos viables y no viables obtenidos. Se observaron diferencias significativas en contenido total de ácidos grasos saturados y monoinsaturados entre los huevos viables y no viables con una mayor concentración en los huevos no viables. No se observaron diferencias en el contenido de ácidos grasos poliinsaturados entre los huevos viables y no viables. Al analizar el contenido de ácidos grasos saturados, monoinsaturados y poliinsaturados en los ovarios de organismos silvestres y domésticos, no se observaron diferencias significativas. No se observaron diferencias en el factor de condición entre los organismos silvestres y domésticos.
    Description: OEA (Organización de Estados Americanos), AICD (Agencia Interamericana para la Cooperación y el Desarrollo), CONACyT (Consejo Nacional de Ciencia y Tecnología)
    Description: In the last decade marine fish aquaculture has called the attention since it experienced a boom in recent years. This is due mainly because of the development and optimization of aquaculture techniques in cages and the improvement of fingerlings production. The number of species under commercial operations has been increased recently. In order to get reasonable economic yield, a marine fish aquaculture system most have control over the entire vital cycle of the species. Our work was focused on gonad maturity and spawning of yellow snapper (Lutjanus argentriventris) varying light duration (photoperiod) and temperature under controlled conditions in laboratory. Spawning was recorded under the range of variation in temperature from 26 oC to 29 oC, with photoperiods from 14 to 16 light hours. Less than 35 % of spawned eggs were fertilized. No significant differences in viability, fertilization, and egg braking were observed. Inter-relationship of temperature and photoperiod was analyzed during spawning experiments. Ovary analysis of Lutjanus argentiventris revealed a non-synchronic type of functional organization. Seven stages of gonad maturity were observed and oogony divided into two development phases: The first was characterized as a prolonged period of slow growth named as “immature stage”. The second phase was a short period where ovocities grow and mature rapidly and spawn. In this phase we identified stages III, IV, V, VI and VII, the last being an hydrate ovocite or in final maturity. Results of biochemical analysis of total lipids, triglycerids, and cholesterol in the ovaries of wild and domestics organisms showed non-significant differences in contents of total lipids and triglycerids, however, significant differences in contents of cholesterol were found. Significant differences of the contents of lipids of the ovocites in late vitelogenesis were found by means of hystochemical techniques. A decrease of vitelo in ovocites of females under a multiple spawning cycle was observed. In relation to content of total lipids, cholesterol and triglicerids non-significant differences were observed between viable and no viable eggs. However, significant differences in total content of saturated and monounsaturated fatty acids between the viable and not viable eggs were observed, with a higher concentration in not viable eggs. No significant differences in the content polyunsaturated fatty acids between the viable and not viable eggs were also observed. Content of saturated, monosaturated, and polyunsaturated fatty acids in ovaries of wild and domestic organisms resulted in no significant differences. Also the condition factor between of wild and domestic organisms resulted in no significant difference.
    Description: Temperatura; fotoperíodo, Lípidos
    Keywords: Fish culture ; Temperature ; Lipids ; Temperature ; Lipids ; Photoperiods ; Marine fish ; Fish culture
    Repository Name: AquaDocs
    Type: Theses and Dissertations
    Format: 118
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