Encyclopedia of the World's Biomes最新文献

Ponds 池塘

Encyclopedia of the World's Biomes Pub Date : 2019-10-25 DOI: 10.1002/9781119489047.ch19

P. Lemmens, Tom Pinceel

{"title":"Ponds","authors":"P. Lemmens, Tom Pinceel","doi":"10.1002/9781119489047.ch19","DOIUrl":"https://doi.org/10.1002/9781119489047.ch19","url":null,"abstract":"SUMMARY he present study investigated the effect of rearing the meagre, Argyrosomus regius in brackish-water pond aquaculture without using supplementary feeding in the Mediterranean area near Damietta City during June, 2017 to June, 2018, Fingerlings of mean length 13.0cm and 40.0 g weight were stocked in brackish-water pond measuring 1 feddan and 1.25 m deep at a rate of 4000 fish/ feddan in a monoculture system on natural occurring prey (natural spawned tilapia) and small shrimp. Temperature varied from 21.0 – 30.8°C; pH, 7.4– 8.9; Dissolved Oxygen (DO), 4.0 – 5.0 mg /L and salinity, 16.0 – 18.8 ppt during the study. Meagre, attained average final length 40 cm/ fish and average final weight 1500g / fish at harvest with an increment of 1460.0g/ fish and a daily gain of 4.0g/ fish. Average survival rate was 80% and net production was 4640.0kg/ feddan. The resultsrevealed that the cost of feeds accounted for the largest proportion (68.55%) of the total cost of fish production,then fingerlings (8.56%), rent (3.35%) and labor (12.60%). This is followed by cost of fixed input and variable coast (12%). This experiment demonstrated the possibility of cultivation of A. regius as well as the higher commercial value where better net return (54.48 LE /feddan) was recorded with investment return of 23.33 LE / return LE cost. The results of the study indicated meagre as a promising candidate for the brackish water pond aquaculture.","PeriodicalId":196271,"journal":{"name":"Encyclopedia of the World's Biomes","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121444507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 138

Glaciers and Ice Sheets 冰川和冰原

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.12441-8

C. DeBeer, M. Sharp, C. Schuster-Wallace

引用次数: 0

Seagrass Biome 海草生态区

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.11748-8

Dinusha R.M. Jayathilake, M. J. Costello

引用次数: 2

Ephemeral Wetlands 短暂的湿地

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.11914-1

U. Deil

引用次数: 4

Biogeography and Chemical Risks on Islands 岛屿上的生物地理学和化学风险

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.12403-0

Lisa Ito, Toru Yamaguchi, A. Tokai, Y. Takahashi

引用次数: 0

Antarctic Marine Mammals 南极海洋哺乳动物

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/B978-0-12-409548-9.11938-4

M. Bester

引用次数: 0

California Oak Savannas and Grasslands 加州橡树草原和草原

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.11959-1

C. Tyler, Karen A. Stahlheber

引用次数: 1

Social Media, Sustainability and Organizations 社会媒体，可持续发展和组织

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.11972-4

Anne H. Reilly

引用次数: 2

Soundscape Ecology 音景生态

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.12008-1

R. Happel, R. Happel

引用次数: 0

Human Appropriation of Net Primary Production 人类对净初级生产的占有

Encyclopedia of the World's Biomes Pub Date : 1900-01-01 DOI: 10.1016/b978-0-12-409548-9.12434-0

C. B. Andersen, J. Quinn

引用次数: 0