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Improving oxidative stability of ready-to-eat shrimp (Metapenaeus stebbingi) by using tarragon and savory essential oils at frozen storage
Get PDFIn this study, the effects of Tarragon and Savory essential oils on oxidative stability of ready-to-eat shrimp (Metapenaeus stebbingi) during three months at frozen storage were investigated. Samples were treated with Tarragon and Savory essential oils and cooked by different cooking methods (frying, oven baking and steaming). Butylated hydroxytoluene (BHT) was used as a reference to compare antioxidant activities. During frozen storage, fat hydrolysis was evaluated through measuring free fatty acid value and oxidation products were measured via peroxide value and thiobarbutiric resistance substance. At the end of storage, the highest amount of free fatty acids (following the control) was observed in steamed savory treated samples (3.2% oleic acid) and the lowest amount in Savory and Ttarragon fried samples (1.11 and 1.75% oleic acid). Following BHT, the lowest amount of peroxide value was obtained from steamed shrimps treated with tarragon (0.92 meq/kg of fat). Also, thiobarbutiric acid values in fried and oven baked samples containing Savory essential oil (0.55 and 0.42 mg MA/kg of fat) was higher than samples containing Tarragon essential oil (0.44 and 0.38 mg MA/kg of fat). The results of the present study indicated that Tarragon and Savory essential oils retarded the oxidation and samples treated with Tarragon essential oil showed slower hydroperoxide and malonaldehyde formation than those of Savory-treated or the untreated samples. The best storage period of the fried, oven baked and steamed products treated with Tarragon and Savory were 1, 2 and 3 months, respectively
Population growth and reproductive potential of five important fishes from the freshwater bodies of Bangladesh
Get PDFPopulation growth (length-weight relationship), and reproductive potential (e.g. fecundity, and sex-ratio) of five important fish species (‘mola’: Amblypharyngodon mola, ‘puti’: Puntius sophore, ‘tengra’: Mystus vittatus, ‘shing’: Heteropneustes fossilis and ‘taki’: Channa punctatus) collected from two important fresh water bodies (namely Hilna beel and Beel Kumari beel) Rajshahi, Bangladesh, were studied. Population growth pattern by length-weight relationship (W=aLb ) for the species differed, and exhibited positive allometric growth (P. sophore in Hilna beel), isometric growth (A. mola and C. punctatus in Hilna beel) and negative allometric growth (M. vittatus & H. fossilis in Hilna beel and A. mola, P. sophore, M. vittatus, C. punctatus and H. fossilis in Beel Kumari beel). The results denoted that fecundity of mature females followed a non-linear relationship (F=aLb ) with total length and exhibited positive allometric growth (b>3) with some exception (A. mola in Hilna beel and M. vittatus in Beel Kumari beel). Fecundity of mature females also increased with total body weight and ovary weight following a linear relationship (F=a+bW). Differences in values of sexratios with seasons for all species in this study may have resulted from different environmental factors as well as breeding seasons. The findings of this study would be useful in imposing adequate regulations for the conservation of these fascinating fishes in the fresh water bodies of Bangladesh
Vietnam: learning from warnings
Get PDFA recent Consultation Workshop discussed awareness and policy support to protect ecosystems, reduce illegal fishing and promote co-management in the central coastal region of Vietnam
The Santiago de Compostela Declaration: promoting equal opportunities in fisheries and aquaculture
Get PDFThe ‘Santiago de Compostela Declaration for Equal Opportunities in the Fishing Sector and Aquaculture’ was approved at the end of the opening day of the First International Conference of Women in Fisheries 5-7 November 2018. Held in Santiago de Compostela, the capital of northwest Spain’s Galicia region, the meeting was organized jointly by the Ministerio de Agricultura, Pesca y Alimentación (the Ministry of Agriculture, Fisheries and Food, also known as MAPAMA) – a ministerial department of the Government of Spain – and the Food and Agriculture Organization of the United Nations (FAO)
Vietnam: fisheries legislation, re-visiting the law
Get PDFThe government of Vietnam seeks to empower the country's fishermen through the landmark passage of an amended fisheries la
Tanzania: networking for strength
Get PDFA newly established network of women fish processors and traders promises to improve the prospects of women in Africa’s post-harvest secto
Comparison of antibiotics and bacteriocins antibacterial activity on Xanthomonas citri subsp.citri
Get PDFCitrus canker is a citrus disease species created by the bacterium Xanthomonas citri subsp.citri. Many citrus, such as oranges, lime, and grapefruit are affected by the infectious bacteria and stems, leaves and fruits are experiencing loss. In this experiment antibacterial effects of five kinds of antibiotics including ampicillin, kanamycin, chloramphenicol, penicillin, streptomycin, Cronobacteriocin DGH2 and Enterobacteriocin DGH4 were evaluated on 107 strains of Xanthomonas citri subsp.citri. MIC and MBC data for antibiotics and bacteriocins against Xanthomonas strains were performed. According to this project, Xanthomonas strains were comparatively susceptible and resistant to Cronobacteriocin DGH2, Enterobacteriocin DGH4, ampicillin, kanamycin, chloramphenicol, penicillin and streptomycin. NIGEB-183 strain is the most sensitive to these antibiotics and bacteriocins. However, only the NIGEB-242R1 strain is resistant to chloramphenicol. Penicillin has minimum inhibitory effects on Xanthomonas strains. Based on this case study, chloramphenicol is the most antibacterial activity among antibacterial agents and this compound is a good candidate for inhibitory activity. Cronobacteriocin DGH2 has a moderate antibacterial activity against Xanthomonas strains
Assessment of Fisheries Resources in the Babuyan Channel
Get PDFBabuyan Channel is one of the major fishing grounds in the country providing livelihood, income, and employment particularly to fisherfolk living in the coastal areas of the Northern Philippines thus, there is a need to assess the status of the area to determine strategies and policies to sustain its production and livelihood of the fisherfolk. The study determined the types of fishing boat and gear operating in the area, the annual fish catch estimates to include commercial and municipal production, the catch per unit effort of various gears,the seasonality of dominant species, the relative abundance and population parameters of some commercially important species to include Decapterus macrosoma, Coryphaena hippurus, and Trichiurus lepturus using data collected from 2009 to 2013, and the methods used by the National Stock Assessment Program. Most of the fishing boats and gears operating in the Babuyan Channel are under the municipal fisheries sector. However, production is higher in the commercial sector suggesting higher fishing effort and catch rate was exerted by commercial fishing boats and gears in the fishing ground. The trend of annual fish production in the fishing ground is fluctuating as reflected by the changing production in both municipal and commercial sector during the study period. The fluctuating production may be due to environmental, social, and economic factors such as increasing operation cost due to increasing fuel price, conflict, and livelihood shifting on elvers gathering in the earlier part of 2011-2012. The noted increase in 2013 was mainly due to the strict implementation of FAO 242, banning elvers gathering, and policies formulated at the local level. Drift Filter Net dominated the commercial and municipal fisheries, respectively. There were 256 species belonging to 69 families caught in the fishing ground indicating a high diversity in the area. N. tennuipes topped the production in Babuyan Channel caught by the Drift Filter Net and Pair Trawl in the mouth of Cagayan River in Aparri, Cagayan. As observed, the fishing mortality values were higher than the natural mortality, an indication that high fishing pressure is being experienced on the fishing ground
Habitat Characteristic and Reproductive Biology of the Flat-ribbed scallop, Decatopecten radula (Linnaeus, 1758) on the Coastal waters of Guiuan, Eastern Samar
Get PDFDecatopecten radula is highly sought for its shell meat making it as a source of food and income for local shellfish gatherers in Guiuan, Eastern Samar. This study provides biological information for future conservation and management. Data were obtained monthly in the three selected sites within coastal waters of Guiuan, Eastern Samar from January 2016 to December 2016. These scallops were distributed at shallow areas of Trinidad Tubabao Island, Kamandag Reef, and Magluto Reef in depths of approximately 1-5 meters throughout the sampling period. Scallops are abundant in Kamandag reef where the site is characterized by its rocky area and mainly composed of a sandy bottom. Scallops were found on the surface of the sediment, attached to rocks or hard elements, hidden in a seagrass and seaweed. Physico-chemical parameters were observed within a narrow and normal range. Water temperature did not vary widely from 28°C to 30°C while salinity, pH, and dissolved oxygen ranged from 33-34, 8.2-8.7, and 3.4–4.8 mg/L respectively. The results from the 825 scallops showed that D. radula is dioecious species with four gonad stages (developing, mature, spawning, spent) based on the histological examination and calculation of gonadosomatic index (GSI). The spawning period of the species is protracted and spawning peaks occur from August to November with a male-female sex ratio of 1:1.24. Size at sexual maturity reached 55 mm shell height (SH) in males and 60 mm SH in females. Thus, the collection of scallop should be limited to individuals >60 mm shell height
