scholarly journals Acquisition of potential for sperm motility in rainbow trout and chum salmon

1986 ◽  
Vol 126 (1) ◽  
pp. 89-96 ◽  
Author(s):  
S. Morisawa ◽  
M. Morisawa
Keyword(s):  
Rainbow Trout ◽  
Chum Salmon ◽  
Distal Portion ◽  
Reproductive Organ ◽  
Spawning Ground ◽  
Sperm Duct ◽  
Testicular Spermatozoa ◽  
Male Reproductive Organ ◽  
Short Period ◽  
Triton X

The male reproductive organ of rainbow trout and chum salmon consists of a pair of testes and sperm ducts. Spermatozoa in the distal portion of the sperm ducts exhibit full motility in the K+-free medium. However, spermatozoa from the testis were almost immotile in this medium. This suggests that the spermatozoa acquire a capacity for movement during their passage from the testis along the sperm duct. In chum salmon migrating into a bay, the sperm duct was almost empty. However, after the fish have travelled upstream for 1 km to their spawning ground in the river, the spermatozoa have left the testis, moved into the sperm duct and are capable of becoming motile. Thus it is probable that the process of acquiring the ability to move occurs within a relatively short period in this simple reproductive organ. Additionally, testicular spermatozoa demembranated with Triton X-100 exhibited motility, although the motility was less than that of demembranated spermatozoa from the sperm duct, suggesting that the acquisition of motility may correspond with the development of some function of the plasma membrane.

Induction of potential for sperm motility by bicarbonate and pH in rainbow trout and chum salmon

1988 ◽  
Vol 136 (1) ◽  
pp. 13-22 ◽  
Author(s):  
S. Morisawa ◽  
M. Morisawa
Keyword(s):  
Rainbow Trout ◽  
Seminal Plasma ◽  
Magnesium Chloride ◽  
Chum Salmon ◽  
Ph Value ◽  
Bicarbonate Concentration ◽  
Sodium Potassium ◽  
Sperm Duct ◽  
Calcium Magnesium ◽  
Immotile Spermatozoa

Spermatozoa of rainbow trout and chum salmon, which have no potential for motility in the testis, acquire that potential in the sperm duct. This paper demonstrates that there is little difference between the levels of sodium, potassium, calcium, magnesium, chloride and osmolality of the seminal plasma in the testis and in the sperm duct. However, the bicarbonate concentration of the seminal plasma and the pH value of semen were higher in the sperm duct than in the testis. When immotile spermatozoa obtained from the testis were incubated in artificial seminal plasma with a high pH and containing HCO3-, spermatozoa became motile within 1 h. These results suggest that spermatozoa of salmonid fish acquire the potential for motility as a result of the increase in seminal bicarbonate concentration and pH that occurs as spermatozoa pass from the testis to the sperm duct.

scholarly journals Resorption of spermatozoa in the sperm duct of rainbow trout during the post-spawning period.

1983 ◽  
Vol 49 (3) ◽  
pp. 387-392 ◽  
Author(s):  
Roland BILLARD ◽  
Fumio TAKASHIMA
Keyword(s):  
Rainbow Trout ◽  
Sperm Duct ◽  
Spawning Period ◽  
Post Spawning

Spawning Behavior of Chum Salmon (Oncorhynchus keta) and Rainbow Trout (Salmo gairdneri)

1975 ◽  
Vol 32 (5) ◽  
pp. 633-642 ◽  
Author(s):  
A. F. Tautz ◽  
C. Groot
Keyword(s):  
Rainbow Trout ◽  
Chum Salmon ◽  
Nest Site ◽  
Salmo Gairdneri ◽  
Oncorhynchus Keta ◽  
Spawning Behavior ◽  
Current Pattern ◽  
Chum Salmon Oncorhynchus Keta ◽  
Nest Sites ◽  
Gravel Size

Detailed accounts of the spawning behavior of chum salmon (Oncorhynchus keta) and rainbow trout (Salmo gairdneri) in laboratory flumes are provided. The behavioral activities, quivering, probing, and crossing over increase in frequency as a function of time prior to spawning whereas digging remains constant or decreases slightly. Maps of digging locations and movie films suggest nest shape and current pattern are monitored by the female, allowing her to intensify her digging activity near the center of the nest. Probing appears to be a signal to the male indicating approach of oviposition and also provides information to the female regarding the shape and suitability of the nest site. The probing act is also used in the synchronization of the male and female spawning acts. Changes in velocity do not appear to markedly affect nest construction either in terms of number of digs to oviposition or in size of nest constructed. It is inferred that velocity and gravel size are important insofar as they influence the construction of a suitable nest depression. Nest sites would appear to be selected on the basis of acceleration of flow rather than velocity per se though high limits must obviously exist.

scholarly journals Duplicate Genetic Loci and Variant Froms of Malate Dehydrogenase in Chum Salmon and Rainbow Trout

1972 ◽  
Vol 38 (7) ◽  
pp. 699-706 ◽  
Author(s):  
Ken-ichi NUMACHI ◽  
Yoshiharu MATSUMIYA ◽  
Ryozo SATO
Keyword(s):  
Rainbow Trout ◽  
Malate Dehydrogenase ◽  
Chum Salmon ◽  
Genetic Loci

scholarly journals Severe impairment of male reproductive organ development in a low SMN expressing mouse model of spinal muscular atrophy

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Eric W. Ottesen ◽  
Matthew D. Howell ◽  
Natalia N. Singh ◽  
Joonbae Seo ◽  
Elizabeth M. Whitley ◽  
...  
Keyword(s):  
Mouse Model ◽  
Spinal Muscular Atrophy ◽  
Muscular Atrophy ◽  
Reproductive Organ ◽  
Organ Development ◽  
Male Reproductive Organ ◽  
Severe Impairment

scholarly journals Isolation and developmental expression of male reproductive organ-specific genes in a dioecious campion, Melandrium album (Silene latifolia)

1996 ◽  
Vol 10 (4) ◽  
pp. 679-689 ◽  
Author(s):  
Sachihiro Matsunaga ◽  
Shigeyuki Kawano ◽  
Hiroyoshi Takano ◽  
Hidenobu Uchida ◽  
Atsushi Sakai ◽  
...  
Keyword(s):  
Reproductive Organ ◽  
Silene Latifolia ◽  
Developmental Expression ◽  
Male Reproductive Organ ◽  
Melandrium Album ◽  
Organ Specific

scholarly journals Comparison of the swimming ability and upstream-migration behavior between chum salmon and masu salmon

2014 ◽  
Vol 71 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Koji Miyoshi ◽  
Kazufumi Hayashida ◽  
Taku Sakashita ◽  
Makoto Fujii ◽  
Hisaya Nii ◽  
...  
Keyword(s):  
Swimming Speed ◽  
Chum Salmon ◽  
Swimming Performance ◽  
High Water ◽  
Masu Salmon ◽  
Oncorhynchus Keta ◽  
Upstream Migration ◽  
Migration Behavior ◽  
Spawning Ground ◽  
Long Distance

The spawning ground of chum salmon (Oncorhynchus keta) is usually located farther downriver than that of masu salmon (Oncorhynchus masou) in Hokkaido, Japan. To compare the swimming abilities of these two species, the relationship between swimming speed and oxygen consumption was compared using a swim tunnel in the laboratory. Then, the upstream-migration behaviors of chum salmon and masu salmon were compared using electromyogram telemetry at fish passages in the Toyohira River, Hokkaido. In the laboratory study, the standard metabolic rate of masu salmon was lower and the critical swimming speed (Ucrit) was faster than those of chum salmon. In the field study, the holding time needed to recover the swimming performance exceeding Ucrit at the fish passages and the trial number needed to pass the fish passages were significantly lower for masu salmon than chum salmon. These results revealed that masu salmon are more adaptable to extended swimming in high water velocity conditions than chum salmon and that masu salmon are better equipped for a long distance upstream migration to their spawning ground than chum salmon.

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