Observations on the Glochidial Stage of the Freshwater Mussel Hyridella (Hyridella) drapeta (Iredale) (Mollusca : Pelecypoda)

1979 ◽  
Vol 30 (3) ◽  
pp. 411
Author(s):  
L Atkins
Keyword(s):  
Salmo Trutta ◽  
Freshwater Mussel ◽  
Early Life History ◽  
Epithelial Tissue ◽  
Average Standard Deviation ◽  
Infection Period ◽  
Galaxias Maculatus ◽  
Brown Trout Salmo Trutta ◽  
History Of ◽  
Australian Freshwater

The early life history of the freshwater mussel H. (H.) drapeta was investigated between September 1975 and November 1976. Observations from this study are basically consistent with those from previous investigations of glochidia of Australian freshwater mussels. The glochidia were found to be subtriangular in outline and possess an S-shaped larval tooth on the ventral margin of each valve. The dimensions (average�standard deviation) of the glochidia were: height 0.23� 0.01 mm; length 0.33�0.01 mm; height/length ratio 70.6�2.7%. The glochidia were observed to parasitize the river blackfish, Gadopsis marmorutus and the galaxiids Galaxias maculatus and G. olidus. Peak infections occurred between July and February. A single brown trout, Salmo trutta, was observed to be infected during one peak infection period. The gills of host fish were the major site of attachment and the glochidia were observed to be surrounded with a layer of epithelial tissue.

Characterizing the early life history of an imperiled freshwater mussel (Ptychobranchus jonesi) with host-fish determination and fecundity estimation

2017 ◽  
Vol 36 (2) ◽  
pp. 338-350 ◽  
Author(s):  
John M. McLeod ◽  
Howard L. Jelks ◽  
Sandra Pursifull ◽  
Nathan A. Johnson
Keyword(s):  
Life History ◽  
Early Life ◽  
Freshwater Mussel ◽  
Early Life History ◽  
Host Fish ◽  
History Of

Rearing experiments with five species of Australian freshwater fishes. II. Morphogenesis and ontogeny

1967 ◽  
Vol 18 (2) ◽  
pp. 155 ◽  
Author(s):  
JS Lake
Keyword(s):  
Early Stage ◽  
Average Length ◽  
Perca Fluviatilis ◽  
Early Life History ◽  
Coarse Sand ◽  
Stage Of Development ◽  
History Of ◽  
Pelagic Eggs ◽  
Newly Hatched Larvae ◽  
Australian Freshwater

The eggs, embryonic development, and larvae of five species of fish, endemic to Australia, are described and compared. They are Tandanus tandanus, Plectroplites ambiguus, Maccullochella macquariensis, Bidyanus bidyanus, and Carassiops klunzingeri. Plectroplites ambiguus and B. bidyanus both have pelagic eggs with diameters of 3.9 and 2.8 mm, respectively. Hatching times for these two species are similar being about 30 hr at water temperatures of about 25°C. The newly hatched larvae are at an early stage of development and average 3.2 and 3.6 mm in length, respectively. The eggs of T. tandanus are demersal, non-adhesive, average 3.2 mm in diameter, and are laid in a nest usually made in gravel or coarse sand. Hatching takes 6-7 days at a temperature between 20 and 25°C and the newly hatched larvae emerge at an average length of 7.1 mm. Maccullochella macquariensis lays eggs which are demersal and adhesive and this species utilizes hard objects such as the inside of sunken hollow logs for attachment of the eggs. Eggs average 3.4 mm in diameter, hatching can take place in 6 days at temperatures approaching 25°C but the larvae are at an earlier stage of development than those which hatch later. Under river conditions hatching probably takes place at temperatures nearer 20°C when they may take 10-14 days to hatch. Early hatched larvae may be only 6 mm in length: those which take longer to hatch, even at the same temperature, are usually about 9 mm in length. The eggs of C. klunzingeri are very small, ovoid, and when water-hardened may vary in diameter from 0.4 to 0.5 mm. Hatching takes place in 47-53 hr at a temperature range of 18-23°C. The larvae average 1.9 mm when newly hatched and are undeveloped. Observations on the early life history of Perca fluviatilis, an introduced species, are also described. These observations indicate that high minimum water temperatures before spawning or during growth of the embryo may contribute to the control of the distribution of this species either by causing damage to the oocytes of the adult fish or by premature hatching of the eggs. High summer water temperatures alone, were previously accepted as the reason for the control of the distribution of this species.

Evidence of Salmo salar × Salmo trutta Hybridization in a North American River

1981 ◽  
Vol 38 (5) ◽  
pp. 552-554 ◽  
Author(s):  
Kenneth F. Beland ◽  
Franklin L. Roberts ◽  
Richard L. Saunders
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Genetic Interaction ◽  
Western North America ◽  
Hybrid Swarms ◽  
American River ◽  
Brown Trout Salmo Trutta ◽  
History Of

Electrophoretic examination of 56 wild Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) from the Stewiacke River, Nova Scotia, revealed one individual believed to be a hybrid between these two species. The possibility of loss of the genetic integrity of each species is considered. A long history of sympatry between Atlantic salmon and brown trout in Europe may have prevented the formation of hybrid swarms as occurred in western North America following introduction of nonindigenous Salmo.Key words: electrophoresis, introgression, enzymes, genetic interaction

Life-History of the Adfluvial Brown Trout (Salmo trutta L.) in Eastern Fennoscandia

Brown Trout ◽  
2017 ◽  
pp. 267-295 ◽  
Author(s):  
A. Huusko ◽  
A. Vainikka ◽  
J.T. Syrjänen ◽  
P. Orell ◽  
P. Louhi ◽  
...  
Keyword(s):  
Life History ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta ◽  
History Of

Genetic structure and demographic history of brown trout (Salmo trutta) populations from the southern Balkans

2008 ◽  
Vol 53 (8) ◽  
pp. 1555-1566 ◽  
Author(s):  
APOSTOLOS P. APOSTOLIDIS ◽  
MARIA-JOSE MADEIRA ◽  
MICHAEL M. HANSEN ◽  
ANNIE MACHORDOM
Keyword(s):  
Genetic Structure ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Demographic History ◽  
Brown Trout Salmo Trutta ◽  
History Of ◽  
Southern Balkans
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