Impact of Fish Farm Management on Physico-chemical Properties of Water and Sediments in earthen ponds
text
article
2016
eng
The study was conducted in two fish farms located at ElRayed area, Kafer El-Sheikh governorate, Egypt, to assess the impact of management on water and sediments characteristics. The two farms had different feeding regimes; the first farm uses pelleted feed, while the second one receives organic fertilization, was replicated in four ponds (8400m2 each). Water samples were collected monthly and sediment at the beginning and the end of experimental period to determine both water and sediment quality. The results revealed that there were no differences in water in temperature, electrical conductivity and total hardness between the two farms. While, noted significant differences were observed in water pH, dissolved oxygen (DO), secchi disk, total alkalinity, orthophosphate, nitrogen component (ammonia, nitrate and nitrite) and chlorophyll “a”. Concerning physical parameters of sediment, an increase in organic matter content in surface layer was observed compared the subsurface layer especially in fertilizer fish farm. The differences in sediment pH were insignificant. The changes in sand and clay percentage in surface layer were higher than the subsurface layer. Chemical properties of sediment changed in terms of salinity and ions content, leaching from the surface to the subsurface layer. Salinity and different ions were decreased in the surface layer of the two fish farms by the end of the experiment. The surface layer in the fertilizer fish farm contained a higher percentage of nutrients nitrogen, phosphorous and potassium compared the feed fish farm. Water quality in fish farms is greatly influenced by feed management and fertilizer inputs which in turn affect sediment quality in ponds.
Egyptian Journal for Aquaculture
Blue Resources for Aquaculture, Environment and Society Development
2090-7877
6
v.
2
no.
2016
1
20
https://eja.journals.ekb.eg/article_45441_3f723660e3455b7a212379f37083645e.pdf
dx.doi.org/10.21608/eja.2016.45441
FACTORS AFFECTING ON ADOPTION OF FISH FARMING ENTERPRISES THE INNOVATIONS TECHNICAL RECOMMENDATIONS FOR MARICULTURE
Hamed
Semida
Fish Extension department, 1. Central Lab. for Aquaculture Research, Agriculture Research Center
author
Ahmed
Elshafei
Researcher, Dept. of Fish Extension and Socioeconomics, Central Laborotry for Aquaculture Research.
author
Mohammed
Attia
2. Agriculture Extension Dept., Faculty of Agriculture, Al-Azhar University
author
text
article
2016
eng
This research aimed to identify some of personal and professional characteristics of marine fish farming enterprises, identify the level of adoption fish farming enterprises for the innovations extension recommendations of mariculture, determine the relationship between the level of adoption fish farming enterprises the innovations extension recommendations of mariculture and the independent variables studied, identify some of the problems facing marine fish farming enterprises, and suggestions of fish farmers for development of mariculture.this research conducted at Al-Deeph triangle, Damietta governorate because its importance in mariculture, and rely on questionnaire through personal interview to collect data from a simple random sample reached 170 farmers during March and April 2016, has been used to analyze data both tabular presentation loops and percentages, and the Chi-Square test and coefficient of compatibility.The most important results showed that nearly two-thirds of respondents (64.7%) the level of adoption for the innovations extension recommendations for mariculture located between weak and average level of adoption, the results showed there was a significant relationship at the level (0.01) between the level of adoption fish farming enterprises for the innovations extension recommendations in mariculture and between each of the number of experience, culture farm system, significant relations at the level of (0.05) between the level adoption of fish farming enterprises respondents to the innovations extension recommendations in mariculture and between age, number of family children, fish farm area, the availability of the innovations equipment, participating in aquaculture association.The results showed that the most important problems facing fish farming enterprises in mariculture: industrial feed high price of Mariculture, fry marine fish high prices, and the problem of the length of production cycle in marine fish farming, and the most important proposals for the development of mariculture: establishment of fry hatcheries, find low prices alternatives for feed, and increase the rental period.
Egyptian Journal for Aquaculture
Blue Resources for Aquaculture, Environment and Society Development
2090-7877
6
v.
2
no.
2016
21
36
https://eja.journals.ekb.eg/article_275457_0bd1add2a56d1568a7eb54c86655da01.pdf
dx.doi.org/10.21608/eja.2016.275457