The Life History of Climacia areolaris (Hagen), a Neuropterous 'Parasite' of Fresh Water Sponges

1952 ◽  
Vol 47 (1) ◽  
pp. 130 ◽  
Author(s):  
Harley P. Brown
Keyword(s):  
Life History ◽  
Fresh Water ◽  
History Of

IX. On the life-history of spirillum

1878 ◽  
Vol 27 (185-189) ◽  
pp. 481-485
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Physiological Laboratory ◽  
University College ◽  
History Of ◽  
The Common

Notwithstanding the numerous and fruitful researches which have been recently made into the life-history of Bacteria, our knowledge of the common and interesting curved and spiral forms— the Vibrio and Spirillum of Ehrenberg—has made little or no advance since his time, neither embryonic nor reproductive forms having ever been observed; while even the zooglœa phase, so characteristic of Bacterium and Bacillus, has only once been mentioned, and then in a different form. A fresh-water aquarium, which has been stagnating since last summer in the Physiological Laboratory of University College, con­tained in winter vast numbers of ordinary motile Spirillum. On recently re-examining the water, one zooglœa film after another having in the meantime formed on the surface, thickened, broken, and sunk, we found that these motile forms had almost disappeared, while the films consisted almost entirely of resting Spirillum in a gelatinous-looking matrix, similar to that of Bacterium and Bacillus . Among these were two or three apparently distinct kinds of filaments, some resting and colourless, others motile, and filled with highly refracting bright yellowish-brown spheres. Such a field is represented in fig. 1.

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.

Life History of Sea-Running Brook Trout (Salvelinus fontinalis) of Moser River, N.S.

1940 ◽  
Vol 5a (2) ◽  
pp. 176-186 ◽  
Author(s):  
H. C. White
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Large Fish ◽  
History Of

Smolts, kelts and non-mature large fish descend in May and early June to the sea, to remain feeding in the estuary or near the shore. They began (1939) to ascend the river in late June, and 93% of the "run" was in July.Fish marked when descending one branch of the river ascended both that branch and the river above but the proportion of marked fish was greater in the branch.These trout agree with the local salmon in having smolts that become silvery before migration and that are two or three years old. Trout smolts and kelts remain in the sea only about two months before returning to fresh water.

scholarly journals Some observations on the life history of Strophitus edentulus

1916 ◽  
Author(s):  
◽  
Earl Albert Martin
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Convergent Evolution ◽  
Additional Data ◽  
Unpublished Work ◽  
History Of

Text is the Introduction to this thesis: Strophitus edentulus is a fresh water mussel which has been said to go through its metamorphosis both as a parasite on fish (Howard 1914) and without parasitism (Lefevre and Curtis 1912). This condition in Strophitus is rendered more interesting by the fact that there is but one other exception to the parasitic habit among the fresh water mussels. This exception, Anodonta imbecillis (Say), is one of the hermaphroditic species and is not closely related to Strophitus. Since these two species are widely separated in structure, and since the same changes are occurring in each form, it is possible that we have here a case of convergent evolution, the investigation of which may throw some light on the nature of this most interesting adaptation of the fresh water mussels. In the following paper I have presented a review of the observations and experiments from which the above conclusions were drawn, together with some additional data which I have collected myself and a discussion of certain uncompleted and unpublished work which was placed in my hands.

Atlantic Salmon in the Sea

1972 ◽  
Vol 73 ◽  
pp. 423-428 ◽  
Author(s):  
K. A. Pyefinch
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Fresh Water ◽  
Long Time ◽  
History Of

The main facts about the life history of Atlantic salmon have been known for a surprisingly long time. Neill (1946) gives an account of early writings on this subject which makes it clear that, for over four hundred years, it has been known that salmon breed in fresh-water, that they spend a period there before migrating to the sea and that, once in the sea, they undertake long migrations. These earlier writers tended to underestimate the period of time spent in the sea (e.g. they thought it likely that salmon returned to fresh water in the same year that they migrated to sea) but, otherwise, their knowledge of the life history of salmon was remarkably complete and accurate.

Further Investigations on the Life-History of the Salmon in Fresh Water

1902 ◽  
Vol 23 ◽  
pp. 44-54 ◽  
Author(s):  
D. Noël Paton ◽  
M. I. Newbigin
Keyword(s):  
Life History ◽  
Fresh Water ◽  
History Of

In the “Report on Investigations into the Life-History of the Salmon in Fresh Water,” published in 1898, the changes which the fish undergoes between the months of May and November were dealt with, but there was no material available to enable the observations to be extended throughout the remaining five months of the year, from December to April.

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