Reproductive biology and histological studies of ovarian development ofSchizothorax plagiostomusin river Lidder from Kashmir Himalaya

2019 ◽  
Vol 35 (2) ◽  
pp. 512-519
Author(s):  
Muddasir Jan ◽  
Imtiaz Ahmed
Keyword(s):  
Reproductive Biology ◽  
Ovarian Development ◽  
Kashmir Himalaya ◽  
Histological Studies

scholarly journals Reproductive biology of Poecilia sphenops Valenciennes, 1846 (Cyprinidontiformes: Poeciliidae) at the Emiliano Zapata Reservoir in Morelos, Mexico

2016 ◽  
Vol 14 (2) ◽  
Author(s):  
José L. Gómez-Márquez ◽  
Bertha Peña-Mendoza ◽  
José L. Guzmán-Santiago
Keyword(s):  
Reproductive Biology ◽  
Native Species ◽  
Ovarian Development ◽  
Mesh Size ◽  
Central Mexico ◽  
Development Stages ◽  
Males And Females ◽  
Male Sex ◽  
Poecilia Sphenops ◽  
Monthly Variations

ABSTRACT Poecilia sphenops is a native species recently recorded in the Balsas basin and the Amacuzac River in Morelos (Mexico), in which it is abundant and widely distributed. This study analyzed some aspects of the reproductive biology of Poecilia sphenops from the Emiliano Zapata Reservoir, in Central Mexico. Specimens were collected using a 20 m-long seine with a 5 mm mesh size, from January to December 2006. A total of 581 specimens were collected: 407 females (70.0%), 83 males (14.3%) and 91 individuals with no differentiated sex (15.7%). Fish ranged from 20 to 96 mm in total length and 0.01 to 13.07 g in body weight. The female to male sex ratio (4.9:1) deviated significantly from the unity (χ2= 214.2, p<0.05). Monthly variations in gonadosomatic (GSI) and hepatosomatic (HSI) indexes and ovarian development stages showed that P. sphenops spawning season occurred between July and October, concurring with the rainy season. Another reproduction peak was registered in February. The largest length registered for males and females was 96 mm and 83 mm, respectively.

The Reproductive Biology of the Rabbit Flea Spilopsyllus Cuniculi (Dale) and The Dependence of this Species Upon the Breeding of Its Host

1964 ◽  
Vol 41 (2) ◽  
pp. 371-402
Author(s):  
A. R. MEAD-BRIGGS
Keyword(s):  
Critical Point ◽  
Reproductive Biology ◽  
Ovarian Development ◽  
Steroid Hormone ◽  
Corpus Allatum ◽  
Pregnant Female ◽  
Ovarian Activity ◽  
Developmental Processes ◽  
Hormone Levels ◽  
Adult Insect

1. Unlike any other species of flea which has been cultured successfully Spilopsyllus cumculi (Dale) is entirely dependent for its own reproduction upon its host becoming pregnant. 2. The ovaries of fleas kept on male or non-pregnant female rabbits remain immature whereas those on a pregnant host are mature at the time of parturition. Vitellogenesis commences at a critical point approximately 7 days pre-partum, irrespective of how long the fleas have been on the host. It is postulated that a factor required by the flea for ovarian development is only available during the final week of pregnancy, and not at all in male or non-pregnant rabbits. The factor disappears from the adult after parturition but is present in her nestlings for at least 7 days. 3. Most fleas desert the adult doe shortly after the young are born and enter her nest, where copulation and oviposition occur. 4. The factor does not act solely as a trigger initiating in the flea developmental processes which then continue in its absence; ovarian regression occurs among maturing fleas transferred to hosts that do not supply the factor. 5. The processes of vitellogenesis, not those of oogenesis, fail in the absence of the factor. It is suggested that the ‘yolk-forming hormone’ normally secreted by the corpus allatum of the adult insect may only be produced by rabbit fleas when they can obtain the postulated factor. Variations in the quantity of this factor available to fleas on different hosts could explain the observed variations in ovarian activity. Some parallels between the factor and steroid hormone levels in the host's blood are discussed.

Reproductive biology of the large freshwater crayfish Cherax cainii in south-western Australia

2003 ◽  
Vol 54 (5) ◽  
pp. 597 ◽  
Author(s):  
Stephen J. Beatty ◽  
David L. Morgan ◽  
Howard S. Gill
Keyword(s):  
Histological Examination ◽  
Reproductive Biology ◽  
Western Australia ◽  
Ovarian Development ◽  
Reproductive Potential ◽  
Stage Iv ◽  
Gonadal Development ◽  
Freshwater Crayfish ◽  
Potential Fecundity ◽  
The Mean

The reproductive biology of Cherax cainii was studied in an impoundment dam in south-western Australia using histological examination of ovarian development (previous studies describing the reproductive biology of freshwater crayfish have relied solely on macroscopic descriptions of gonadal development). Spawning occurred between August and November and peaked in late August and September, with the percentage of berried females increasing from 50% in September to 96% in November before declining to 11% in December. Juveniles were released from berried females between late November and early December. Female gonads recovered dramatically after spawning with 81% of mature females possessing stage IV (maturing) gonads in March. The respective orbital carapace lengths at which 50 and 95% of C. cainii reached maturity were 32.1 and 37.9 mm for females, and 28.6 and 38.8 mm for males. The mean potential fecundity (i.e. number of mature ovarian oocytes prior to spawning) was 443 compared with 286 for the mean effective fecundity (i.e. number of pleopodal eggs, embryos or juveniles following spawning). The fact that the full ovarian reproductive potential of C. cainii is not attained is probably due to the limitation of egg attachment space on the pleopods.

Adult Reproductive-Biology of Geitoneura-Klugii and Geitoneura-Acantha (Lepidoptera, Satyrinae) Near Melbourne, Australia

1988 ◽  
Vol 36 (4) ◽  
pp. 397 ◽  
Author(s):  
MF Braby ◽  
TR New
Keyword(s):  
Reproductive Biology ◽  
Ovarian Development ◽  
Extended Period ◽  
Food Plants ◽  
Larval Food ◽  
Egg Development ◽  
Flight Season ◽  
Reproductive Females

Adult Geitoneura klugii klugii (Guerin-Meneville) and G. acantha ocrea (Guest) were collected throughout the 1985-86 flight season. Females were dissected to determine mating state and ovarian development on each occasion. Fecundity and duration of egg development were measured. Most females mate when pre-reproductive. Females were predominantly monogamous, and few instances of multiple insemination were revealed by spermatophore counts. Both sexes are reproductively active soon after emergence and neither species experiences any major delay in ovarian development. Oviposition occurs over an extended period with most eggs deposited singly. Fecundity of the two species is similar: follicle counts gave estimates of 200-280, and females laid similar numbers of eggs, up to 399 (G. klugii) or 323 (G. acantha). Eggs of G. acantha hatched, at a range of temperatures, within 2-5 weeks. In contrast, eggs of G. klugii developed but did not hatch, and it is likely that this species has a pre-hatching diapause. We suggest that this major difference between the two closely related co-existing species may reflect adaptations to preferred larval food-plants.

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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