Reproductive biology of the Short-snouted Seahorse, Hippocampus hippocampus (Linnaeus, 1758) in the Eastern Black Sea of Turkey (Osteichthyes: Syngnathidae)

2020 ◽  
Vol 66 (3) ◽  
pp. 222-231
Author(s):  
Burcu Taylan ◽  
Şule Gürkan ◽  
Ertan Taşkavak
Keyword(s):  
Reproductive Biology ◽  
Black Sea ◽  
Hippocampus Hippocampus

Reproductive biology of Trachurus mediterraneus (Carangidae): a detailed study for the Marmara–Black Sea stock

2012 ◽  
Vol 93 (2) ◽  
pp. 357-364 ◽  
Author(s):  
Nazli Demirel ◽  
Ahsen Yüksek
Keyword(s):  
Reproductive Biology ◽  
Black Sea ◽  
Sexual Maturity ◽  
Oocyte Development ◽  
Horse Mackerel ◽  
Batch Fecundity ◽  
Sea Of Marmara ◽  
Size At Sexual Maturity ◽  
One Year ◽  
Period Duration

The reproductive biology of Mediterranean horse mackerel Trachurus mediterraneus was investigated in the Sea of Marmara over a one-year period. Duration and timing of the spawning season, gonad histology, oocyte development and size at sexual maturity were determined. The presence of all stages of oocytes without any distinct size hiatus indicated that oocyte development of Mediterranean horse mackerel is asynchronous with indeterminate fecundity. Spawning starts in May, peaks in July–August and ends in September. Sizes at 50% maturity were found to be 12.2 and 12.5 cm (total length) for females and males, respectively. Mean batch fecundity was calculated as 10136 ± 703 eggs. Our results on the size at sexual maturity and batch fecundity for the Sea of Marmara differed significantly from published results from the Mediterranean Sea. We ascribe these differences to different stock structures in these seas. Our results form the basis for future reproductive biology studies on the under-studied Marmara–Black Sea stock.

Fine structure and possible functions of the hermaphrodite duct of some pulmonate snails (Mollusca: Gastropoda)

1990 ◽  
Vol 48 (3) ◽  
pp. 68-69
Author(s):  
Alan N. Hodgson
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Structure ◽  
Seminal Vesicle ◽  
Reproductive Biology ◽  
Light Microscope ◽  
Light Microscope Level ◽  
Transmission Electron ◽  
Standard Techniques

The hermaphrodite duct of pulmonate snails connects the ovotestis to the fertilization pouch. The duct is typically divided into three zones; aproximal duct which leaves the ovotestis, the middle duct (seminal vesicle) and the distal ovotestis duct. The seminal vesicle forms the major portion of the duct and is thought to store sperm prior to copulation. In addition the duct may also play a role in sperm maturation and degredation. Although the structure of the seminal vesicle has been described for a number of snails at the light microscope level there appear to be only two descriptions of the ultrastructure of this tissue. Clearly if the role of the hermaphrodite duct in the reproductive biology of pulmonatesis to be understood, knowledge of its fine structure is required.Hermaphrodite ducts, both containing and lacking sperm, of species of the terrestrial pulmonate genera Sphincterochila, Levantina, and Helix and the marine pulmonate genus Siphonaria were prepared for transmission electron microscopy by standard techniques.

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