Showing 3 results for Dra
Hadiseh Dadras , Shabanali Nezami , Hosein Khara , Sharouz Baradaran Noveiri,
Volume 3, Issue 1 (6-2011)
Abstract
This study was carried out during the artificial propagation season in the shahid beheshti Sturgeon Rearing and Propagation Center and International STURGEON Research Institute (Rasht) during 2009. Eleven wild male Acipenser Persicus brood fish were used for this study. Each brood fish was stripped after receiving hormone injection and then sperm samples were examined separately. Fertilization rate and hatching rate of larvae were also determined. Analysis of relationship between sperm pHand density and indices of reproduction showed positive and direct relationship between hatching rate and sperm pH (p<0.05, r=0.711), as well as between sperm pH and fertilization rate (p<0.05, r=0.633). However egative relationship was opserved between sperm density and fertilization rate(p<0.05, r=0.640) and between sperm density and hatching rate (p<0.05, r=0.745).
Bita Seraj , Pedram Malekpouri , Mehdi Shamsaie , Takavar Mohammadian,
Volume 4, Issue 4 (3-2013)
Abstract
The economic value of grouper in aquaculture industry as well as existing of threatening environmental factors in their natural habitats of this fish has led to an increase in importance of captive breeding of this species. In this study, the efficacy of semi-artificial propagation of orange-spotted grouper in Khuzestan province has been investigated. In this respect, eight breeders, including four males and four females, were transferred to the Center of Marine Fish Propagation. After anesthetizing, the morphometric parameters, including total length, standard length and body weight have been recorded. Simultaneously, ova were checked for their quality. All fish were hold in ratio of 1:1 (male to female) and breeding was performed at midnight without hormonal injection. At each spawning time randomly thirty eggs were collected and egg diameters and fertilization rate have been determined. Other related parameters to breeding efficacy, including hatching rate, larvae length and larvae survival rate were measured in an appropriate time. The obtained data show that fish having higher length and weight produced more ova, eggs and larvae in size (P<0.05). In this study, the maximum amount of fertilization and hatching rates were estimated as 98 and 88% respectively. Survival rate of larvae were also determined until yolk sac absorption time and its amount was not more than 20% in all cases. Using regression analysis, ova and egg diameters showed significant relationships between the total length and body weight. Moreover, larvae total length total width yolk sac length and oil globule diameter have been also measured and discussed in this manuscript.
Amin Dra, Afshin Akhondzadeh Basti, Saeid Tamadoni Jahromi, Peyman Mahasti Shotorbani, Mehdi Jabar Zadeh Shiadeh,
Volume 13, Issue 1 (Spring 2022)
Abstract
Various microorganisms, including Psychrotroph bacteria, are responsible for a number of food-origin diseases, including histamine poisoning.This study was conducted to investigate the range of changes in the amount of histamine measured in Persian Gulf Anchovy fish in two methods of drying (industrial and traditional methods) and the effect of different methods on the amount of bacterial flora according to different seasons and times. Sampling was performed in three seasons of autumn, winter and spring of 2019-2020 from the dominant fishing areas of Anchovy species in the Persian Gulf region. Determine the amount of histamine was performed by high performance liquid chromatography HPLC and calculate the contamination of the unknown sample using the calibration curve and dilution factor and using the standard method of the Iranian Institute of Standards and Industrial Research, National Standard Iran, No. 9594. The results showed that although the range of changes in the amount of histamine measured in both industrial and traditional methods was very close to each other, but the comparison of two methods shows that the level of histamine measured in the traditional method is much higher. the comparison of the means using Kolmogorov test showed that there was a significant difference between the two methods in terms of the amount of histamine measured (P<0.05). The results of Kolmogorov-Smirnov test in relation to the effects of seasonal changes on the trend of changes in the amount of histamine measured in the two methods of drying fish showed significant difference in the amount of histamine measured in each of the studied seasons and also between the two methods used for drying the fish (P<0.05). In this study, regardless of the effects of time treatment in each of the fish drying methods, we do not have a significant difference between the studied seasons in terms of measured histamine levels (P> 0.05). According to studies, the proportion of bacteria in different seasons has increased over time, which may be due to the fact that during the process of keeping fish, the number of Psychrotroph bacteria as the dominant bacterial species has been increased. Also according to the results compared with other reported cases, it can be concluded that measurable histamine concentrations in fish products may be variable due to the speed of histamine production, method used in each season and the rate of their decomposition during preparation and drying.
