Proceedings, Volume 17E. Schweizerbart'sche Verlagsbuchhandlung, 1969 - Freshwater biology |
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Page 560
... fish destroyed , coarse fish species eliminated or the aim is to mineralise the surplus amount of organic sediments on the pond bottom which effects unfavourably the chemical properties of water . Practice shows that these interventions ...
... fish destroyed , coarse fish species eliminated or the aim is to mineralise the surplus amount of organic sediments on the pond bottom which effects unfavourably the chemical properties of water . Practice shows that these interventions ...
Page 561
... fish food on the pond bottom and its utilization by the fish stock . The chironomid larvae are more easily acces- sible for fish burrowed in the pond bottom than the Oligochaeta which generally live deeper down in the mud layers and are ...
... fish food on the pond bottom and its utilization by the fish stock . The chironomid larvae are more easily acces- sible for fish burrowed in the pond bottom than the Oligochaeta which generally live deeper down in the mud layers and are ...
Page 605
... Fish stocked No. stocked Days of growth Weight during stocking ( gr ) Fish yield Carp 262 290 40-110 A Mugil 1188 290 1.0-50 kg / ha 130 1061 Tilapia hybrids 132 120 1.0 351 Total yield per hectar = 1542 kg Carp 327 238 40-110 280 B ...
... Fish stocked No. stocked Days of growth Weight during stocking ( gr ) Fish yield Carp 262 290 40-110 A Mugil 1188 290 1.0-50 kg / ha 130 1061 Tilapia hybrids 132 120 1.0 351 Total yield per hectar = 1542 kg Carp 327 238 40-110 280 B ...
Contents
Report on the seventeenth congress | 1 |
National Water System | 15 |
Microorganismes responsables du pouvoir | 124 |
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abundant algae algal animals année bacteria basin benthic benthos biological biomass bottom fauna carbon cells changes chemical chironomids cichlid Cladocera concentrations copepods Creek Crustacea cts/min culture Daphnia decrease density depth dissolved organic distribution dry weight ecology epilimnion eutrophication factors ferrigram fish freshwater growth hypolimnion increase Internat ions Lake George Lake Tanganyika Lake Tiberias lake water layers limiting Limnol limnology maximum measured metabolic meters mg/l mg/m³ nitrate nitrogen numbers nutrient Nyasa observed occur Oceanogr Onondaga Lake oxygen period phosphate phosphorus photosynthetic phytoplankton plankton pond population present primary production quantity ratio relatively reservoir River saline samples saprobity seasonal sediments shallow shore speciation species standing crop stations stratification substrate summer surface temperature thermocline Tiefe tintinnids TONOLLI Truckee River upper uptake values variation Verein Verh vertical Volta Lake winter zooplankton µg/l