scholarly journals Experimental life cycle of Hysterothylacium aduncum (Nematoda: Anisakidae) in fresh water.

1987 ◽  
Vol 22 (4) ◽  
pp. 243-251 ◽  
Author(s):  
Tomoyoshi YOSHINAGA ◽  
Kazuo OGAWA ◽  
Hisatsugu WAKABAYASHI
Keyword(s):  
Life Cycle ◽  
Fresh Water ◽  
Hysterothylacium Aduncum

DESCRIPTION OF CIRCUMONCOBOTHRIUM SINGHII N.SP. FROM CLARIAS BATRACUS OF SAVITRI RIVER AT DAPOLI DISTRICT RATNAGIRI (M.S.) INDIA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
R.R. DANDAWATE
Keyword(s):  
Life Cycle ◽  
Fresh Water ◽  
Summer Season ◽  
Fresh Water Fish ◽  
Water Fish

Present paper deals with study of cestode parasites of genus Circumoncobothrium from fresh water fish Clarius batracus at Savitri river, (Dapoli) for the percentages of infection occurance during summer season,minimum during winter and tolarate during rainy season.The parasite mainly infected the intestine of host and fed on nutrients from digested food. It completed its life cycle in the intestine of host. By camparing different characters of it to identify that the species is new

scholarly journals The chronic effects of salinity on the Crustacean Moina affinis Birge (1893)

2004 ◽  
Vol 1 (2) ◽  
pp. 200-206
Author(s):  
Baghdad Science Journal
Keyword(s):  
Life Cycle ◽  
Fresh Water ◽  
Chronic Exposure ◽  
Exposure Period ◽  
Control Group ◽  
Length Growth ◽  
Chronic Effects ◽  
Final Length

Thi s study included the effect of chronic exposure of di fferent concentrations of Nan on the biology of fresh water zroDplonk ton species Moina 41.112' ( Cladcxe'ra The concentrations used for chronic exposure were 03, 0.75. 1 960 to investigate iI effects on the life cycle and la lables of this species after exposure period and the range of this exposure effects on the rate of expectation for further life, also the effect of salinity on reproduotive parameters was studied which included average of total number of eggs and young produced, volume clutch's (6.95. indiclutch for control group , 14.516 indi clutch for 0.596a ,3_65 ind./ clutch for (175 5(.. and 03 Ind} cruel] for 1960) and number of Clutch's (5.5 clutch/ female for control group, 1.7 clutch/ funEoc for 0.5.9(z.z, 1:2 dutch?' female for 0,75960 and 0,1 oluchi female for 196.) which howed a reduction_ But had no effects on the time 10 tarsi clutch produced. Time of surviving ( 12.9 day for control g.roup. 63 day for 0.5%0, 15_2 day for 0.75%.0 and 4.6 day for I 9f,), average final length and average of daily length, growth increasing were studied_ In addition to the studying the orient of salinity on the number of moults which showed a reduction. in its number.

Changes in the cellular composition of the gill epithelium during the life cycle of a nonparasitic lamprey: functional and evolutionary implications

2011 ◽  
Vol 89 (6) ◽  
pp. 538-545 ◽  
Author(s):  
Helmut Bartels ◽  
Ursula Fazekas ◽  
John H. Youson ◽  
Ian C. Potter
Keyword(s):  
Life Cycle ◽  
Fresh Water ◽  
Chloride Cells ◽  
Evolutionary Significance ◽  
Cellular Composition ◽  
Gill Epithelium ◽  
Pavement Cells ◽  
Parasitic Species ◽  
Lampetra Planeri ◽  
Lamprey Species

Several lamprey species form pairs, comprising an anadromous parasitic species and a derivative nonparasitic species that neither leaves fresh water nor feeds as an adult. This paper provides the first description of the radical changes undergone by the cellular composition of the gill epithelium during the major phases in the life cycle of a nonparasitic lamprey (American brook lamprey, Lethenteron appendix (DeKay, 1842) (=  Lampetra appendix (DeKay, 1842)) and discusses their potential functional and evolutionary significance. The gill epithelium of the larva of L. appendix contains ammocoete mitochondrion-rich cells (AMRCs), intercalated mitochondrion-rich cells, and pavement cells, as does that of the larva of anadromous parasitic species which likewise lives in fresh water. By the completion of metamorphosis, the AMRCs have disappeared and well-developed chloride cells have been produced, the latter cell type being essential for osmoregulation by its closely related anadromous species in hypertonic environments. By the attainment of sexual maturity, the chloride cells have been lost. Such changes in the timing of chloride cell representation could help account for the ability of some metamorphosing, but not mature individuals of another nonparasitic species ( Lampetra planeri (Bloch, 1784)), to osmoregulate in up to 70% of seawater. The well-developed chloride cells in the nonparasitic L. appendix represent the retention of an ancestral character.

The life cycle of Stegodexamene anguillae n.g., n.sp., an allocreadiid trematode from New Zealand

Parasitology ◽  
1951 ◽  
Vol 41 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
W. V. Macfarlane
Keyword(s):  
Life Cycle ◽  
New Zealand ◽  
Calcium Carbonate ◽  
Fresh Water ◽  
New Genus ◽  
Anguilla Dieffenbachii ◽  
Freshwater Eels

1. A new genus of trematode (family Allocre-adiidae) from the intestine of freshwater eels is described, and named Stegodexamene anguillae.2. The genus is related to Aephnidiogenes, Lepidapedon and Neophasis, but differs significantly from each of them.3. The life cycle followed is from the adult in Anguilla dieffenbachii to the redia in Potamopyrgus antipodum (fresh-water gastropod). The cercaria encysts in the eloetrid fish Gobiomorphus gobioides.4. Progenetic production of eggs and spermatozoa occurs in the metacercariae.5. Metacercarial excretory spherules are composed of calcium carbonate.

PROBING FOR STRONTIUM PATTERNS IN OTOLITHS OF COMMON BULLIES FROM THE CLUTHA RIVER, NEW ZEALAND

2002 ◽  
Vol 12 (03n04) ◽  
pp. 109-115 ◽  
Author(s):  
A. MARKWITZ ◽  
B. BARRY ◽  
G. CLOSS ◽  
M. SMITH
Keyword(s):  
Life History ◽  
Life Cycle ◽  
New Zealand ◽  
Freshwater Fish ◽  
Fresh Water ◽  
Juvenile Phase ◽  
History Of ◽  
The Individual ◽  
Fish Otoliths ◽  
Gobiomorphus Cotidianus

Common bullies, Gobiomorphus cotidianus, are a widespread small New Zealand freshwater fish, with a life-cycle that may include an optional juvenile marine phase. We used the strontium variation in fish otoliths in an attempt to track the life history of the individual fish since the interlayer variation reflect the exposure of fish to background environmental levels of Sr at the time of deposition. One possible mechanism by which Sr can be enriched in otoliths is by seawater, which usually has a higher Sr/Ca ratio than fresh water. Locally resolved elemental measurements with a proton microprobe enable therefore the detection of variation in Sr that may reflect single or multiple migrations of freshwater fish into seawater. The most striking feature of this study is the observation of high Sr/Ca ratios in the cores of all otoliths, including those from fish caught 50 km inland. This suggests different environments in the life cycle of common bullies in the lower reaches of the Clutha river. A marine juvenile phase may be a common feature. Preliminary area scans were used to select suitable transects for detailed line scans which gave greatly improved statistics.

scholarly journals Comparison of life cycle assessment for different volume polypropylene jars

2012 ◽  
pp. 159-167
Author(s):  
Nevena Krkic ◽  
Vera Lazic ◽  
Danijela Suput
Keyword(s):  
Global Warming ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Injection Molding ◽  
Fresh Water ◽  
Mass Flow ◽  
Global Warming Potential ◽  
Life Cycle Inventory ◽  
Significant Difference ◽  
The Impact

When deciding what packaging is the most appropriate for a product there are many factors to be considered. One of them is the impact of the packaging on environment. In this work, life cycle inventory and life cycle assessment of two different volume packagings were compared. The data were collected on the types and amounts of materials and energy consumption in the process of packaging and distribution of hand cream packed in polypropylene jars of 200 and 350 mL. Life cycle inventory (LCI) and life cycle impact assessment (LCA) were calculated. It was found that the total mass flow was higher for the jars of 350 mL. After analyzing individual flows, it was found that in both cycles (polypropylene jars of 200 and 350 mL),the consumption of fresh water was a dominant flow. This fresh water flow is mostly (95%) consumed in the injection molding process of manufacturing jars from polypropylene granules. The LCA analysis showed no significant difference in global warming potential between different volume jars. The process that mostly affected global warming was the production of polypropylene jars from polypropylene granules by injection molding for both jar volumes. Judging by the global warming potential, there is no difference of the environmental impact between investigated jars, but considering the mass flow and water consumption, more environmental friendly were the 200 mL jars.

scholarly journals Water Use Issues

2020 ◽  
Vol 6 (5) ◽  
pp. 257-266
Author(s):  
D. Burdinov
Keyword(s):  
Life Cycle ◽  
Water Supply ◽  
Fresh Water ◽  
Water Use ◽  
Supply System ◽  
Water Supply System ◽  
Sewage System ◽  
The World ◽  
Pros And Cons ◽  
Water Disposal

The stages of the water life cycle are considered not only in the water supply system, but also in the water disposal system. The pros and cons of various methods of disinfecting fresh water are examined. Particular attention is paid to the problems of water reserves not only in Russia, but also in the world. The problems of the water supply and sewage system in Russia are considered. Examples of solutions to these problems are provided.

Studies on the Life Cycle of Campeloma rufum, A Fresh-Water Snail

1937 ◽  
Vol 71 (733) ◽  
pp. 167-184 ◽  
Author(s):  
Harley J. Van Cleave ◽  
Dorothy A. Altringer
Keyword(s):  
Life Cycle ◽  
Fresh Water ◽  
Fresh Water Snail
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