Aspekte van die spermatologie van die kleinbekgeelvis, Barbus aeneus (Cyprinidae)
- Authors: Vlok, Wynand
- Date: 2014-03-13
- Subjects: Barbus aeneus , Cyprinidae , Fishes - Spermatozoa
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/379392 , uj:4323 , http://hdl.handle.net/10210/9674
- Description: M.Sc. (Zoology) , Milt and blood samples of Aarbus aeneus were collected during November in order to perform chemical analyses of the blood and seminal plasma. Physical analyses were also carried out on milt. Throughout the year testes were collected in order to determine the stages of testicular development. This was done by means of histological analyses. The sperm counts averaged 8,41 x 10-3 cells rom while the spermatocrit value varied between 44% and 82% (average of 61,9%). All the milt samples collected were white in colour showing a high viscosity. Sperm motility gradually declined after activation and stopped after 82,5 seconds. Chemical values of the components tested in the blood plasma were statistically compared to those in the seminal plasma and no statistically significant differences were recorded between sodium, potassium, chloride, calcium, magnesium, glucose, total lipid, total proteien concentrations, osmolality and pH. The only component where a difference in concentration occured was fructose (30% probability). Sodium, calcium, magnesium, glucose, fructose, total lipid and total proteien concentrations in the blood plasma were significantly lower than the corresponding concentrations in the seminal plasma. In contrast the potassium concentration were higher in the seminal plasma. The pH of the seminal plasma (8,63) was alkaline while a pH of 7,5 was recorded for blood plasma. In the two lobe testis of Barbus aeneus semen is collected with seminiferous ducts into the vas deferens which together with the blood vessels are housed within a hilus. The testis is surrounded by a tunica albugenea and the seminiferous lobules are filled with cysts. The testis of the smallmouth yellowfish appears to be lobular and sperm are deposited into lumens which exist between the cysts. During the resting phase the interstitial tissue is very difficult to distinguish and is seen as a thin layer of cells between the lobules seperating them from one another...
- Full Text:
- Authors: Vlok, Wynand
- Date: 2014-03-13
- Subjects: Barbus aeneus , Cyprinidae , Fishes - Spermatozoa
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/379392 , uj:4323 , http://hdl.handle.net/10210/9674
- Description: M.Sc. (Zoology) , Milt and blood samples of Aarbus aeneus were collected during November in order to perform chemical analyses of the blood and seminal plasma. Physical analyses were also carried out on milt. Throughout the year testes were collected in order to determine the stages of testicular development. This was done by means of histological analyses. The sperm counts averaged 8,41 x 10-3 cells rom while the spermatocrit value varied between 44% and 82% (average of 61,9%). All the milt samples collected were white in colour showing a high viscosity. Sperm motility gradually declined after activation and stopped after 82,5 seconds. Chemical values of the components tested in the blood plasma were statistically compared to those in the seminal plasma and no statistically significant differences were recorded between sodium, potassium, chloride, calcium, magnesium, glucose, total lipid, total proteien concentrations, osmolality and pH. The only component where a difference in concentration occured was fructose (30% probability). Sodium, calcium, magnesium, glucose, fructose, total lipid and total proteien concentrations in the blood plasma were significantly lower than the corresponding concentrations in the seminal plasma. In contrast the potassium concentration were higher in the seminal plasma. The pH of the seminal plasma (8,63) was alkaline while a pH of 7,5 was recorded for blood plasma. In the two lobe testis of Barbus aeneus semen is collected with seminiferous ducts into the vas deferens which together with the blood vessels are housed within a hilus. The testis is surrounded by a tunica albugenea and the seminiferous lobules are filled with cysts. The testis of the smallmouth yellowfish appears to be lobular and sperm are deposited into lumens which exist between the cysts. During the resting phase the interstitial tissue is very difficult to distinguish and is seen as a thin layer of cells between the lobules seperating them from one another...
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Ektoparasitiese protozoa van die Cyprinidae en Cichlidae van Suid-Afrika en Israel
- Authors: Basson, Linda
- Date: 2014-05-29
- Subjects: Cichlids , Cyprinidae , Parasitism , Protozoa - South Africa , Protozoa - Israel
- Type: Thesis
- Identifier: uj:11241 , http://hdl.handle.net/10210/10834
- Description: M.Sc. (Zoology) , Please refer to full text to view abstract
- Full Text:
- Authors: Basson, Linda
- Date: 2014-05-29
- Subjects: Cichlids , Cyprinidae , Parasitism , Protozoa - South Africa , Protozoa - Israel
- Type: Thesis
- Identifier: uj:11241 , http://hdl.handle.net/10210/10834
- Description: M.Sc. (Zoology) , Please refer to full text to view abstract
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Aspekte van die spermatologie van Labeo ruddi en Labeo rosae asook die kriobewaring van semen van geselekteerde Labeo spesies (Pisces : Cyprinidae)
- Viljoen, Barend Christiaan Stephanus
- Authors: Viljoen, Barend Christiaan Stephanus
- Date: 2014-11-17
- Subjects: Cyprinidae
- Type: Thesis
- Identifier: uj:12881 , http://hdl.handle.net/10210/12770
- Description: Ph.D. (Zoology) , Please refer to full text to view abstract
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- Authors: Viljoen, Barend Christiaan Stephanus
- Date: 2014-11-17
- Subjects: Cyprinidae
- Type: Thesis
- Identifier: uj:12881 , http://hdl.handle.net/10210/12770
- Description: Ph.D. (Zoology) , Please refer to full text to view abstract
- Full Text:
Development of a conservation program on Pseudobarbus quathlambae in the catchment area of phase 1B of the Lesotho Highlands Water Project
- Authors: Rall, Johannes Lambertus
- Date: 2009-09-21T09:33:48Z
- Subjects: Minnows , Cyprinidae , Rare fishes , Stream ecology , Water resources development , Lesotho
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/370615 , uj:8631 , http://hdl.handle.net/10210/2971
- Description: D.Phil.
- Full Text: false
- Authors: Rall, Johannes Lambertus
- Date: 2009-09-21T09:33:48Z
- Subjects: Minnows , Cyprinidae , Rare fishes , Stream ecology , Water resources development , Lesotho
- Type: Thesis
- Identifier: http://ujcontent.uj.ac.za8080/10210/370615 , uj:8631 , http://hdl.handle.net/10210/2971
- Description: D.Phil.
- Full Text: false
An ecological study on the Maluti minnow (Pseudobarbus quathlambae) in the catchment area of Phase 1B of the Lesotho Highland Water Scheme
- Authors: Rall, Johannes Lambertus
- Date: 2014-11-20
- Subjects: Minnows - Lesotho , Cyprinidae , Jordane River (Lesotho) , Senqunyane River (Lesotho) , Bokoaneng River (Lesotho)
- Type: Thesis
- Identifier: uj:13038 , http://hdl.handle.net/10210/12920
- Description: M.Sc. (Zoology) , Please refer to full text to view abstract
- Full Text:
- Authors: Rall, Johannes Lambertus
- Date: 2014-11-20
- Subjects: Minnows - Lesotho , Cyprinidae , Jordane River (Lesotho) , Senqunyane River (Lesotho) , Bokoaneng River (Lesotho)
- Type: Thesis
- Identifier: uj:13038 , http://hdl.handle.net/10210/12920
- Description: M.Sc. (Zoology) , Please refer to full text to view abstract
- Full Text:
Die testisultrastruktuur van Cyprinidae in Suid-Afrika en Israel met spesiale verwysing na die kriobewaring van Barbus aeneus-sperme
- Authors: Vlok, Wynand
- Date: 2014-06-11
- Subjects: Cyprinidae , Carp , Barbus aeneus , Cryopreservation of organs, tissues, etc. , Fishes - Germplasm resources - Cryopreservation
- Type: Thesis
- Identifier: uj:11507 , http://hdl.handle.net/10210/11202
- Description: D.Sc. (Zoology) , The spermatogenesis of two freshwater species from South Africa, Barbus marequensis and B. polylepis, and three fresh water species from Israel, B. canis, B. longiceps and Capoeta damascina, was studied. A histological comparison of the process of spermatogenesis was undertaken. The breeding cycle of B. marequensis, B. polylepis, B. canis, B. longiceps and C. damascina was similar to the breeding cycle of B. aeneus and four phases occured within the cycle. The four distinctive phases are post spawning phase, rest phase, pre-spawning phase and the spawning phase (Vlok, 1986) . During the post spawning phase a decline in sperm development is observed and possible lisosomal activity is responsible for the resorption of sperm cells not shed during the spawning phase. The presence of collagen structure provides a distinctive character to the tissue of the testis. The resting phase is characterised by the absence of the lobular structure and the testis is dominated by the collagen tissue. The testis is small and unobtrusive in the abdominal cavities of both species. At the onset of the pre-spawning phase, the testis is filled with spermatogonia. The lobular structure becomes more prominent and the interstitial tissue can be distinguished. Later during the phase, the synchronised development of sperm cells in the cysts of the lobules can be observed, whilst sperm cells in adjacent lobules are in different stages of development. During the spawning phase the testis of all species studied contain mature sperm . cells in the lumens of the lobules.
- Full Text:
- Authors: Vlok, Wynand
- Date: 2014-06-11
- Subjects: Cyprinidae , Carp , Barbus aeneus , Cryopreservation of organs, tissues, etc. , Fishes - Germplasm resources - Cryopreservation
- Type: Thesis
- Identifier: uj:11507 , http://hdl.handle.net/10210/11202
- Description: D.Sc. (Zoology) , The spermatogenesis of two freshwater species from South Africa, Barbus marequensis and B. polylepis, and three fresh water species from Israel, B. canis, B. longiceps and Capoeta damascina, was studied. A histological comparison of the process of spermatogenesis was undertaken. The breeding cycle of B. marequensis, B. polylepis, B. canis, B. longiceps and C. damascina was similar to the breeding cycle of B. aeneus and four phases occured within the cycle. The four distinctive phases are post spawning phase, rest phase, pre-spawning phase and the spawning phase (Vlok, 1986) . During the post spawning phase a decline in sperm development is observed and possible lisosomal activity is responsible for the resorption of sperm cells not shed during the spawning phase. The presence of collagen structure provides a distinctive character to the tissue of the testis. The resting phase is characterised by the absence of the lobular structure and the testis is dominated by the collagen tissue. The testis is small and unobtrusive in the abdominal cavities of both species. At the onset of the pre-spawning phase, the testis is filled with spermatogonia. The lobular structure becomes more prominent and the interstitial tissue can be distinguished. Later during the phase, the synchronised development of sperm cells in the cysts of the lobules can be observed, whilst sperm cells in adjacent lobules are in different stages of development. During the spawning phase the testis of all species studied contain mature sperm . cells in the lumens of the lobules.
- Full Text:
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