Reproductive biology and endocrinology of female red gurnard, Chelidonichthys kumu (Lesson and Garnot) (family Triglidae), from the Hauraki Gulf, New Zealand

1994 ◽  
Vol 45 (2) ◽  
pp. 131 ◽  
Author(s):  
SJ Clearwater ◽  
NW Pankhurst
Keyword(s):  
New Zealand ◽  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Plasma Concentrations ◽  
Early Summer ◽  
Spawning Season ◽  
Hepatosomatic Index ◽  
Fish Processing ◽  
North Eastern ◽  
Gonadal Recrudescence

Red gurnard, Chelidonichthys kumu, were sampled by long-lining and from a fish processing factory to investigate the seasonal cycle of reproduction in a population from north-eastern New Zealand. Female red gurnard showed changes in gonadosomatic index (GSI) and frequencies of stages of ovarian development consistent with spawning from spring (September) until autumn (May). Peak GSI (approximately 6%) occurred in late spring or early summer, and minimum GSI (approximately 1%) occurred in winter (June). Blood samples were taken from live fish caught on long-lines, and seasonal changes in plasma concentrations of oestradiol-17� (E2) and testosterone (T) were measured by radioimmunoassay. Plasma E2 and T reached maximum concentrations of 1.99 ng mL-1 and 2.06 ng mL-1, respectively, as GSI levels peaked, and then declined as GSI decreased over summer. Plasma E2 and T increased again as GSI began to increase prior to the next spawning season. Maximum hepatosomatic index (HSI) occurred in association with gonadal recrudescence. HSI decreased significantly as the spawning season progressed and showed a significant but irregular increase as recrudescence occurred prior to the following spawning season.

Annual change in reproductive condition and plasma concentrations of sex steroids in black bream, Acanthopagrus butcheri (Munro) (Sparidae)

1998 ◽  
Vol 49 (5) ◽  
pp. 389 ◽  
Author(s):  
J. A. Haddy ◽  
N. W. Pankhurst
Keyword(s):  
Sex Steroids ◽  
Gonadosomatic Index ◽  
Plasma Concentrations ◽  
Early Morning ◽  
Early Summer ◽  
Hepatosomatic Index ◽  
Black Bream ◽  
One Year ◽  
Gonad Condition ◽  
Acanthopagrus Butcheri

Changes in gonadosomatic index (GSI), hepatosomatic index (HSI), gonad stage and plasma concentrations of sex steroids were studied over one year in black bream (Acanthopagrus butcheri). Black bream have an annual reproductive cycle with a 3-month spawning season in spring–early summer. GSI and HSI values were highest in October and May respectively. Plasma concentrations of oestradiol-17β (E2), testosterone (T) and 17,20β-dihydroxy-4-pregnen-3-one (17,20βP) were highest in females in October. Plasma concentrations of E2 and T were highest in ovulated fish. Concentrations of 17,20βP were higher in fish undergoing final oocyte maturation (FOM) than in fish with regressed gonads. In males, plasma concentrations of T and 11-ketotestosterone (11KT) increased in September and remained elevated until January, but concentrations of 17,20βP did not change with season. However, 17,20βP concentrations in spermiated fish were higher than in non-spermiated fish. Daily changes in gonad condition indicated that females undergo daily cycles of ovarian maturation with ovulation occurring after midday. Plasma T and 17,20βP concentrations of females were elevated at midday in association with FOM, but E2 showed no diel change. In males, partially spermiated fish were dominant in the early morning and fully spermiated fish at midday. Plasma T, 11KT and 17,20βP concentrations were low at midnight and reached maximum levels at 0600 hours.

Plasma steriod hormone concentrations in relation to reproductive cycle of the sweep Scorpis lineolatus (Kyphosidae) caught from the wild

1992 ◽  
Vol 43 (4) ◽  
pp. 753 ◽  
Author(s):  
M Deual ◽  
NW Pankhurst
Keyword(s):  
Steroid Hormones ◽  
Reproductive Cycle ◽  
Gonadosomatic Index ◽  
Plasma Concentrations ◽  
Plasma Testosterone ◽  
Hepatosomatic Index ◽  
Spawning Period ◽  
Testosterone Concentration ◽  
Low Concentrations ◽  
Advanced Stages

Changes in gonadosomatic index (GSI), hepatosomatic index (HSI), oocyte development and plasma levels of steroid hormones were studied during the reproductive cycle of the sweep Scorpis lineolatus. GSI values for both sexes were maximal in March and April. During this period the size distribution of oocytes showed a predominance of advanced stages of vitellogenesis, whereas males were completing spermatogenesis. However, staging data suggest that spawning may not begin until April. HSI was maximal 2 months prior to the beginning of gametogenesis in both sexes. Plasma concentrations of oestradiol-17β in females increased rapidly from February, reached a peak (2.3 ng mL-1) in association with the end of vitellogenesis in March, and returned to low concentrations in May and June. Plasma concentrations of 17α,20α-dihydroxy-4-pregnen-3-one (17,20βP) also peaked in March in females, but 17,20βP was generally not detectable in males. Plasma testosterone concentration peaked along with other steroids in March in females but showed no significant change in males. Plasma ll-ketotestosterone (1 1KT) concentration was maximal in males before spawning (February), but was not elevated during the spawning period itself. Changes in oestradiol-17β and testosterone in association with vitellogenensis in females are consistent with those reported for other teleosts, whereas changes in 17,20βP, testosterone and 11-ketotestosterone in males are different from those previously reported.

The ovarian development pattern of pond-reared Chinese mitten crab, Eriocheir sinensis H. Milne-Edwards, 1853

Crustaceana ◽  
2017 ◽  
Vol 90 (4) ◽  
pp. 449-470 ◽  
Author(s):  
Xugan Wu ◽  
Meimei Liu ◽  
Jie Pan ◽  
Hao Chen ◽  
Chaoshu Zeng ◽  
...  
Keyword(s):  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Eriocheir Sinensis ◽  
Stage Iii ◽  
Development Pattern ◽  
Hepatosomatic Index ◽  
Ovarian Maturation ◽  
Chinese Mitten Crab ◽  
Mitten Crab ◽  
Ovarian Morphology

Although pond culture is the major culture method for Chinese mitten crab (Eriocheir sinensis) in China, the pattern of ovarian development in pond-rearedE. sinensisremains unclear. This study investigated the changes in ovarian morphology and histology, gonadosomatic index (GSI), hepatosomatic index (HSI), and monthly variation of the ovarian development pattern during the ovarian maturation of pond-reared femaleE. sinensis. Based on the pubertal moult, and ovarian morphology and histology, the ovarian development cycle ofE. sinensiscould be divided into five stages, i.e., Stage I: the ovary appears thin ribbon-like and translucent, dominated by oogonia (OG) and previtellogenic oocytes (PRO); Stage II: the ovary appears milk white or buff, dominated by endogenous vitellogenic oocytes (EN); Stage III: the ovary appears orange or light brown, dominated by exogenous vitellogenic oocytes (EX); Stage IV: the ovary appears crimson red or brown and ovarian lobes occupy most available body cavities. The major oocytes were nearly mature oocytes (NO); Stage V: the ovary appears deep purple and is filled with mature oocytes (MO). During ovarian maturation, the GSI increased significantly and a significant, positive correlation was found between the GSI and the mean long diameter of the oocyte from stage III to stage V. However, a significantly negative correlation was found between GSI and HSI. The ovarian development of pond-reared femaleE. sinensiswas not synchronous, most of the pubertal moults were found until mid-late August. At the end of August, the percentages of females that reached ovarian stages II and III were 55 and 24%, respectively. After that, the ovarian development of pond-reared femaleE. sinensisbecame fast, and females with stage III or more advanced ovaries were found to be in excess of 80% by the end of September and onward. From the end of November to late December, the GSI of femaleE. sinensisdid not increase significantly, which indicated pond-reared females had reached mature or nearly-mature ovaries by the end of November.

Reproductive biology of four Diplodus species Diplodus vulgaris, D. annularis, D. sargus sargus and D. puntazzo (Sparidae) in the Gulf of Tunis (central Mediterranean)

2011 ◽  
Vol 92 (3) ◽  
pp. 623-631 ◽  
Author(s):  
N. Mouine ◽  
P. Francour ◽  
M.H. Ktari ◽  
N. Chakroun-Marzouk
Keyword(s):  
Gonadosomatic Index ◽  
Spawning Season ◽  
Sexual Cycle ◽  
Hepatosomatic Index ◽  
Central Mediterranean ◽  
Important Species ◽  
Spawning Period ◽  
Gulf Of Tunis ◽  
Sharpsnout Seabream ◽  
First Maturity

The reproductive features of four commercially important species of the Diplodus genus were studied in the Gulf of Tunis to contribute to better fisheries management on the local scale. The study was specifically aimed to estimate sex-ratio and size at first maturity, to determine spawning season, to analyse hepatic and muscular energy reserve changes and to highlight possible regional difference over the Diplodus geographical distribution. A total of 570 Diplodus vulgaris (two-banded seabream), 428 Diplodus annularis (annular seabream), 350 Diplodus sargus sargus (white seabream) and 218 Diplodus puntazzo (sharpsnout seabream) were collected from the commercial catches of the artisanal fleet between October 2004 and June 2006. Male:female ratio was initially skewed in favour of females for the four Diplodus species and especially among larger-sized individuals. Length and age at first maturity was 17.4 ± 0.2 cm total length (TL) (4 years) for D. vulgaris, 9.7 cm TL (2 years) for D. annularis, 21.0 ± 0.3 cm TL (4 years) for D. s. sargus, 21.5 ± 0.2 cm TL (3 years) for D. puntazzo and a recommendation is made for the increasing of the captured length. According to the monthly succession of gonad maturity stages and the yearly gonadosomatic index (GSI) fluctuation, the spawning season of Diplodus species present a temporal succession along the year. The two-banded seabream has a winter spawning period, the white seabream is mainly a spring spawner, the annular seabream spawns essentially in summer months and the spawning of sharpsnout seabream takes place in autumn. Generally, hepatosomatic index presented an inverse trend to GSI in relation to the breeding activity. The condition factor showed significant monthly variations affected by the sexual cycle of the Diplodus species.

scholarly journals Reproductive Biology of Round Herring Etrumeus teres (Dekay, 1842) from the Egyptian Mediterranean Water at Alexandria

ISRN Zoology ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Alaa G. M. Osman ◽  
El Sayed H. Akel ◽  
Mahmoud M. S. Farrag ◽  
Mohsen A. Moustafa
Keyword(s):  
Breeding Season ◽  
Reproductive Behavior ◽  
Developmental Stages ◽  
Gonadosomatic Index ◽  
Spawning Season ◽  
Hepatosomatic Index ◽  
Maturity Stages ◽  
Multiple Spawner ◽  
Monthly Distribution ◽  
Etrumeus Teres

Maturity stages of round herring Etrumeus teres were divided anatomically into six stages. Monthly distribution of such maturity stages showed that E. teres had prolonged spawning season extended from December to May for females and to July for males. The observed sex ratio was 1 : 2 (male: female). Gonadosomatic index (GSI) values were high during breeding season for both sexes. Hepatosomatic index (HIS) values for females increased from December to April and from December to July for males. Both sexes of E. teres showed the same correlation between GSI and HSI during their breeding season. The absolute and relative fecundity increased with increasing of length and weight. Histologically, the ovarian cycle of E. teres was classified into six stages and the testicular cycle into five stages. Female of E. teres was a multiple spawner and had prolonged spawning season with a group-synchronous ovarian which contained oocytes at all stages of development. Also, different sizes of spermatocytes at different developmental stages of maturation were observed during the same season. This may reflect the suitability of the specific reproductive behavior of male and its adaptation to the prolonged spawning season with females.

scholarly journals Fecundity regulation in horse mackerel

2013 ◽  
Vol 71 (3) ◽  
pp. 546-558 ◽  
Author(s):  
Cindy J. G. van Damme ◽  
Anders Thorsen ◽  
Merete Fonn ◽  
Paula Alvarez ◽  
Dolores Garabana ◽  
...  
Keyword(s):  
Lipid Content ◽  
Egg Production ◽  
Gonadosomatic Index ◽  
Production Method ◽  
Spawning Season ◽  
Horse Mackerel ◽  
Hepatosomatic Index ◽  
Batch Fecundity ◽  
Production Methods ◽  
Unbiased Estimates

Abstract Egg production methods have been used successfully in the provision of advice for fisheries management. These methods need accurate and unbiased estimates of fecundity. We explore the reproductive strategy of horse mackerel and estimation of fecundity. Fecundity and fecundity regulation in relation to condition was investigated over a number of years. Fulton's K, lipid content, and hepatosomatic index increased after the start of spawning, though decreased again at the end of spawning. The increase in the gonadosomatic index, fecundity, and body condition after the onset of spawning suggests that horse mackerel utilizes food resources during the spawning season and might be an income breeder. However, the decline in K and lipid before the spawning season suggests that the first batch of oocytes is developed on stored energy. Fecundity varied between years and within a spawning season. Over latitude, variations in fecundity were small. K and lipid content are not reliable indices as proxy for fecundity. Batch fecundity appears to be heterogeneous across the spawning season but homogeneous across latitude. The homogeneity of batch fecundity over latitude could indicate that the daily egg production method is an appropriate approach for estimating the abundance of a wide ranging species, as horse mackerel.

Contaminant Effects on Ovarian Development in English Sole (Parophrys vetulus) from Puget Sound, Washington

1988 ◽  
Vol 45 (12) ◽  
pp. 2133-2146 ◽  
Author(s):  
Lyndal L. Johnson ◽  
Edmundo Casillas ◽  
Tracy K. Collier ◽  
Bruce B. McCain ◽  
Usha Varanasi
Keyword(s):  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Puget Sound ◽  
Contaminated Sites ◽  
English Sole ◽  
Contaminant Exposure ◽  
Plasma Estradiol ◽  
Xenobiotic Compounds ◽  
Gonadal Recrudescence ◽  
Parophrys Vetulus

In a study evaluating the effects of exposure to xenobiotic compounds on ovarian development in English sole (Parophrys vetulus), prespawning females were sampled from four sites in Puget Sound, Washington, during the 1986 and 1987 spawning seasons. Two sampling sites had high concentrations of xenobiotic compounds in the sediment, while the other sites were less contaminated. The following factors associated with ovarian maturation were measured: ovarian developmental stage, ovarian atresia, gonadosomatic index, plasma estradiol, and plasma vitellogenin as estimated from alkali-labile phosphorus. Contaminant exposure was assessed by measuring concentrations of fluorescent aromatic compounds in the bile, hepatic aryl hydrocarbon hydroxylase (AHH) activity, and hepatic polychlorinated biphenyl levels, and liver tissue was examined histologically for the presence of suspected toxicopathic lesions. Female English sole from the heavily contaminated sites were significantly less likely to undergo gonadal recrudescence and had lower mean levels of plasma estradiol than females from the less contaminated sites. The risk of inhibited gonadal recrudescence was significantly increased in sole with elevated hepatic AHH activity, and AHH activity was also significantly negatively correlated with plasma estradiol level. These findings suggest that contaminant exposure may interfere with ovarian development in female English sole.

Recovery ability of common carp (Cyprinus carpio) after a short-term exposure to terbuthylazine

2013 ◽  
Vol 16 (1) ◽  
pp. 17-23 ◽  
Author(s):  
I. Mikulikova ◽  
H. Modra ◽  
J. Blahova ◽  
K. Kruzikova´ ◽  
P. Marsalek ◽  
...  
Keyword(s):  
Cyprinus Carpio ◽  
Histopathological Examination ◽  
Recovery Period ◽  
Plasma Concentrations ◽  
Hepatosomatic Index ◽  
Short Term ◽  
Plasma Albumin ◽  
Short Term Exposure ◽  
High Regeneration ◽  
Biomarkers Of Oxidative Stress

Abstract Effects of a high terbuthylazine concentration (3.3 mg/l) on Cyprinus carpio were studied using a commercial herbicide formulation Click 500 SC (terbuthylazine 500 g/l). The fish were exposed to the pesticide for 24 h and allowed to recover for 6 days. Biometric parameters, plasma biochemical parameters and biomarkers of oxidative stress as well as histopathological changes in selected tissues were assessed on day 1 and 7. After a 24-h exposure, there were significant alterations found in the activities of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) as well as in the plasma concentrations of glucose, natrium, chlorides, calcium and phosphorus. Hepatosomatic index, plasma albumin and lactate reflected the treatment with a delay. Ion levels and ALT were found to be restored after a 6-day recovery period, which was too short for AST activity and glucose to diminish to the control levels. The histopathological examination revealed disorders in the gills of the exposed fish, however, the changes were not detected after a 6-day recovery period. The study shows high regeneration potential of the fish.

PLASMA CONCENTRATIONS OF LUTEINIZING HORMONE, TESTOSTERONE AND ANDROSTENEDIONE IN CASTRATED AND ADRENALECTOMIZED BULL CALVES

1978 ◽  
Vol 79 (1) ◽  
pp. 137-138 ◽  
Author(s):  
J. J. BASS ◽  
A. J. PETERSON ◽  
E. PAYNE
Keyword(s):  
New Zealand ◽  
Plasma Concentration ◽  
Luteinizing Hormone ◽  
Agricultural Research ◽  
Plasma Concentrations ◽  
Young Male ◽  
Research Centre ◽  
Similar Magnitude ◽  
Research Division ◽  
Bull Calves

Ministry of Agriculture and Fisheries, Research Division, Ruakura Agricultural Research Centre, Hamilton, New Zealand (Received 17 April 1978) An increase in the plasma concentration of luteinizing hormone (LH) occurs in response to castration in bull calves aged 1–4 months; this response is of similar magnitude to that seen in cattle castrated as adults (Odell, Hescox & Kiddy, 1970). In bull calves castrated at birth, however, there is no increase in the plasma concentration of LH until after 28 days of age (Bass, Peterson, Payne & Jarnet, 1977). In other species a range of responses to castration has been reported. Gonadectomy of male guinea-pigs 0–35 days after birth produces an increase in the plasma concentration of LH similar to that observed in guineapigs castrated as adults (Donovan, ter Haar, Lockhart, MacKinnon, Mattock & Peddie, 1975). In contrast, the castration of young male macaques does not cause an immediate increase in the

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