Hypolimnetic Aeration and Zooplankton Distribution: A Possible Limitation to the Restoration of Cold-Water Fish Production

1984 ◽  
Vol 41 (1) ◽  
pp. 191-198 ◽  
Author(s):  
Christopher T. Taggart
Keyword(s):  
Cold Water ◽  
Pimephales Promelas ◽  
Food Resource ◽  
Zooplankton Community ◽  
Fish Production ◽  
Fathead Minnows ◽  
Isolated Populations ◽  
Zooplankton Distribution ◽  
Water Fish

Hypolimnetic aeration of a 1.23-ha eutrophic kettle lake during two consecutive summers increased [O2] to more than 4 mg/L in the hypolimnion for extended periods. This improvement did not lead to the expected development of crustacean populations in the previously anoxic, zooplankton-deficient hypolimnion. The rotifer Filinia longiseta was the only zooplankter present, as isolated populations, in both the epilimnion and hypolimnion during summer. Eighty percent of the summer zooplankton community occurred exclusively in the epilimnion, and this was related to the development of an anoxic and toxic metalimnion that restricted migration from the epilimnion to the hypolimnion. Confinement of the zooplankton to the epilimnion coupled with predation by fathead minnows (Pimephales promelas) appeared to be responsible for the change in the zooplankton community from large cladocerans and copepods to smaller species. This study suggests that hypolimnetic aeration as a means of restoring or enhancing the production of cold-water fish may be thwarted by the development of a stable anoxic and toxic metalimnion that precludes the development of the zooplankton food resource.

scholarly journals The current state of trout farming in Himachal Pradesh and its potential for future expansion

2019 ◽  
Vol 34 (01) ◽  
Author(s):  
Madhu Sharma
Keyword(s):  
Rainbow Trout ◽  
Cold Water ◽  
Technical Information ◽  
Himachal Pradesh ◽  
The State ◽  
Total Production ◽  
Fish Production ◽  
Current State ◽  
Water Fish ◽  
The Government

In the Himalayan states of India, the mountainous region is rich in abundant oxygen, fresh water, which is highly suitable for the cultivation of rainbow trout. Himachal Pradesh is a state with many streams and reservoirs and has a large capacity of fish production. Estimated fishery, water resources of the state are about 3000 km, out of which 600 km of cold water streams are suitable for trout cultivation, which can be used for culturing trout. Trout is a cold water fish that grows well in water temperature from 5 oC to 15oC. There are approximately 762 trout forms, including seven run by the government in the state, which are mainly in Kullu, Chamba, Shimla, Kinnaur and Mandi districts. Out of the five zones, there are vast possibilities of producing high prized fish trout in Zone 1 and 2 of Himachal Pradesh. The total production of trout in the state was 0.54 tonnes in 1996-97 and increased to 25 tonnes in 2005-06, compared to 456.73 MT in 2017-2018. Availability of technical information on trout cultivation, breeding and artificial diet has helped tremendously in promoting the aquaculture of trout in the state. Extension and development efforts of rainbow trout production have led to an overall increase in the production of trout fish, but still there is a big difference between the actual and potential trout production. This paper has reviewed its ability to produce trout, present status and future expansion in Himachal Pradesh.

Development of apical pits in chloride cells of the gills of Pimephales promelas after chronic exposure to acid water

1983 ◽  
Vol 41 ◽  
pp. 462-463
Author(s):  
Richard L. Leino ◽  
Jon G. Anderson ◽  
J. Howard McCormick
Keyword(s):  
Confidence Interval ◽  
Chronic Exposure ◽  
Lake Superior ◽  
Pimephales Promelas ◽  
Chloride Cells ◽  
Fathead Minnows ◽  
Secondary Lamellae ◽  
Untreated Water ◽  
Water Ph ◽  
Flow Through

Groups of 12 fathead minnows were exposed for 129 days to Lake Superior water acidified (pH 5.0, 5.5, 6.0 or 6.5) with reagent grade H2SO4 by means of a multichannel toxicant system for flow-through bioassays. Untreated water (pH 7.5) had the following properties: hardness 45.3 ± 0.3 (95% confidence interval) mg/1 as CaCO3; alkalinity 42.6 ± 0.2 mg/1; Cl- 0.03 meq/1; Na+ 0.05 meq/1; K+ 0.01 meq/1; Ca2+ 0.68 meq/1; Mg2+ 0.26 meq/1; dissolved O2 5.8 ± 0.3 mg/1; free CO2 3.2 ± 0.4 mg/1; T= 24.3 ± 0.1°C. The 1st, 2nd and 3rd gills were subsequently processed for LM (methacrylate), TEM and SEM respectively.Three changes involving chloride cells were correlated with increasing acidity: 1) the appearance of apical pits (figs. 2,5 as compared to figs. 1, 3,4) in chloride cells (about 22% of the chloride cells had pits at pH 5.0); 2) increases in their numbers and 3) increases in the % of these cells in the epithelium of the secondary lamellae.

Acidification effects on macroinvertebrates and fathead minnows (Pimephales promelas) in outdoor experimental channels

1983 ◽  
Vol 17 (1) ◽  
pp. 47-63 ◽  
Author(s):  
James A. Zischke ◽  
John W. Arthur ◽  
Kathleen J. Nordlie ◽  
Roger O. Hermanutz ◽  
Douglas A. Standen ◽  
...  
Keyword(s):  
Pimephales Promelas ◽  
Fathead Minnows

scholarly journals Microencapsulation of oil droplets using cold water fish gelatine/gum arabic complex coacervation by membrane emulsification

2013 ◽  
Vol 53 (1) ◽  
pp. 362-372 ◽  
Author(s):  
Emma Piacentini ◽  
Lidietta Giorno ◽  
Marijana M. Dragosavac ◽  
Goran T. Vladisavljević ◽  
Richard G. Holdich
Keyword(s):  
Cold Water ◽  
Gum Arabic ◽  
Complex Coacervation ◽  
Oil Droplets ◽  
Membrane Emulsification ◽  
Water Fish

scholarly journals Untangling mechanisms of crude oil toxicity: Linking gene expression, morphology and PAHs at two developmental stages in a cold-water fish

2021 ◽  
Vol 757 ◽  
pp. 143896
Author(s):  
Elin Sørhus ◽  
Carey E. Donald ◽  
Denis da Silva ◽  
Anders Thorsen ◽  
Ørjan Karlsen ◽  
...  
Keyword(s):  
Gene Expression ◽  
Crude Oil ◽  
Developmental Stages ◽  
Cold Water ◽  
Water Fish ◽  
Oil Toxicity
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