The Reproductive Cycles of Monodonta Lineata and Gibbula Umbilicalis on the Coast of Mid-Wales

1985 ◽  
Vol 65 (4) ◽  
pp. 993-1008 ◽  
Author(s):  
P. R. Garwood ◽  
M. A. Kendall
Keyword(s):  
Gonad Development ◽  
Diameter Distribution ◽  
Oocyte Diameter ◽  
Gamete Release ◽  
Spawning Period ◽  
Jelly Coat ◽  
Reproductive Cycles

At Aberaeron, Dyfed, mid-Wales, the two trochid species, Monodonta lineata and Gibbula umbilicalis breed during the summer months. M. lineata showed a discrete spawning period in late July in both 1980 and 1983, whilst G. umbilicalis spawned in August in both years, though with gamete release prolonged into September in 1980. In both species gonad development begins in April/May, and by June the characteristic bimodal oocyte diameter distribution of mature females has been established. Vitellogenesis and the development of a jelly coat around the oocyte begin when the oocytes have a diameter of 70–80 μm, with mature oocytes reaching 140–180 μm in diameter, excluding the jelly coat.

IMPLANTATION OF LHRH-a HORMONE TO STIMULATION OF GONAD DEVELOPMENT OF HUMPBACK GROUPER SECOND GENERATION ( F-2 )

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
Tridjoko Tridjoko
Keyword(s):  
Body Weight ◽  
Second Generation ◽  
Gonad Development ◽  
Gonadal Development ◽  
Oocyte Diameter ◽  
2Nd Generation ◽  
Length Range ◽  
Concrete Tank ◽  
Implant Treatment ◽  
Stimulation Of

This study aimed to determine the effect of LHRH-a hormone implantation on gonadal development of humpback grouper, Cromileptes altivelis 2nd generation (F-2). Individuals used were 20 female grouper fish with weight range of 600-800 gram/fish and total length range of 28.0-30.0 cm. The treatment used 5 fish each with tagging. Grouper fishes were stocked into the 75 m3 circular concrete tank. Hormone of LHRH-a with dosage of 50 μg/kg body weight was used as implant treatment of (A) 1 time,, (B) 2 times, (C) 3 times, and (D) without implant. The results showed that implantation of LHRH-a hormone were significantly stimulate gonad development of humpback grouper second generation (F-2). Treatment of 3 times implant every month showed the best results produced  oocyte diameter up to 480 μm, while the control of oocyte diameter only reached <400 μm. Keywords: LHRH-a hormone, implantation, Humpback grouper, gonad development

Interpopulation variability of the reproductive cycle of Paracentrotus lividus (Echinodermata: Echinoidea) in the south-western Mediterranean

2000 ◽  
Vol 80 (5) ◽  
pp. 899-907 ◽  
Author(s):  
Mourad Guettaf ◽  
Gustavo A. San Martin ◽  
Patrice Francour
Keyword(s):  
Regional Scale ◽  
Gonad Index ◽  
Paracentrotus Lividus ◽  
Posidonia Oceanica ◽  
Western Mediterranean ◽  
Larval Phase ◽  
Spawning Period ◽  
Rocky Substrate ◽  
Maximum Value ◽  
Reproductive Cycles

The spawning of Paracentrotus lividus has been determined on the basis of the annual gonad index cycle at three sites in the Algiers area presenting low, intermediate and strong hydrodynamism. Three biotopes (Posidonia oceanica beds, rocky substrate with photophilous algae and overgrazed rocky substrate) and two depths (1–3 m and 6–10 m) were considered at these sites, the sex-ratio was always strongly in favour of females (2:1 to 3:1). In all sites but one, there were marked differences in the gonad index and the spawning period between sites; the gonad index reached its maximum value at the site with the weakest hydrodynamism, and the minimum value at the site with the strongest hydrodynamism. Spawning took place in April–May and August–September at the site with the weakest hydrodynamism, in April–June and October–December at the site with intermediate hydrodynamism and only in winter at the site with maximum hydrodynamism. The coexistence, on regional scale, of these reproductive cycles might enable Paracentrotus lividus to compensate the mortality during planktonic larval phase by the fact that spawning of this sea urchin occurred in all seasons.

Reproductive cycle of the Manila clam (Ruditapes philippinarum): an intensively harvested invasive species in the Tagus Estuary (Portugal)

2017 ◽  
Vol 98 (7) ◽  
pp. 1645-1657 ◽  
Author(s):  
Paula Moura ◽  
Paulo Vasconcelos ◽  
Fábio Pereira ◽  
Paula Chainho ◽  
José Lino Costa ◽  
...  
Keyword(s):  
Invasive Species ◽  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Ruditapes Philippinarum ◽  
Manila Clam ◽  
Tagus Estuary ◽  
Gonad Maturation ◽  
Oocyte Diameter ◽  
Ruditapes Decussatus ◽  
Spawning Period

The present study aimed to describe the reproductive cycle and estimate the size at sexual maturity of the Manila clam (Ruditapes philippinarum) in the Tagus Estuary (Portugal). Specimens were collected monthly from September 2013 to December 2015 during fishing surveys using bivalve dredges. The gametogenic cycle was described in detail using gonad histology and monitored throughout the study period by the monthly variation in the frequency of gonad maturation stages, mean gonadal index and mean oocyte diameter. This invasive population of R. philippinarum displayed synchronous gonadal development between sexes, with ripening occurring mainly in April and May followed by an extensive spawning period until November–December. Individuals reached the size at first sexual maturity at 29.4 mm in shell length (i.e. before 1 year old). Furthermore, the reproductive strategy, dynamics and potential were compared between the invasive R. philippinarum and the native congeneric carpet shell clam (Ruditapes decussatus). Overall, the data gathered in this study constitutes valuable baseline information to propose conservation strategies and implement management measures to minimize the harmful impacts caused by this invasive species on local ecosystems and native biodiversity, particularly over populations of autochthonous bivalves.

scholarly journals Spawning season, recruitment and early life distribution of Anchoa tricolor (Spix and Agassiz, 1829) in a tropical bay in southeastern Brazil

2008 ◽  
Vol 68 (4) ◽  
pp. 823-829 ◽  
Author(s):  
FG. Araújo ◽  
MA. Silva ◽  
MCC. Azevedo ◽  
JNS. Santos
Keyword(s):  
Early Life ◽  
Gonad Development ◽  
Late Summer ◽  
Sandy Beaches ◽  
Reproductive Season ◽  
Southeastern Brazil ◽  
Life Distribution ◽  
Beach Seine ◽  
Spawning Period ◽  
Fishery Resource

The pattern of the use of the Sepetiba Bay, a semi-closed 450 km² area in southeastern Brazil, by Anchoa tricolor was investigated to assess spawning period, recruitment and to detect spatial-temporal patterns of this major fishery resource. Fishes were sampled by seine nets, from spring, 1998 to winter, 1999 and by beach seine, from spring, 1998 to winter, 2000. Reproductive season, measured in terms of GSI, gonad development and appearance of recruits, indicate that reproduction occurs from August to March, when they reach the best condition. Recruitment peaks in winter/spring at sandy beaches where they stay until late summer, moving toward deeper bay areas during autumn. After that, they join adults and perform movements between the bay and the adjacent continental shelf to reproduce.

scholarly journals Reproductive studies of Anchoa marinii Hildebrand, 1943 (Actinopterygii: Engraulidae) in the nearby-coastal area of Mar Chiquita coastal lagoon, Buenos Aires, Argentina

2015 ◽  
Vol 13 (1) ◽  
pp. 221-228 ◽  
Author(s):  
Sofía López ◽  
Ezequiel Mabragaña ◽  
Juan Martín Díaz de Astarloa ◽  
Mariano González-Castro
Keyword(s):  
Coastal Lagoon ◽  
Coastal Area ◽  
Species Abundance ◽  
Diameter Distribution ◽  
Female Size ◽  
Oocyte Diameter ◽  
Multiple Spawner ◽  
First Results ◽  
Ovulatory Follicles ◽  
Reproductive Events

The aim of the present study provides the first results on the reproductive biology of the anchovy, Anchoa marinii, in a nearby-coastal area of Mar Chiquita coastal lagoon, 37º32'00"S 57º19'00"W, Argentina. To perform this, we employed mainly female gonads, at both microscopic and macroscopic levels. The oocyte diameter distribution and the microscopy analysis of oocytes, showed different batches of growing oocytes, suggesting that the anchovy is a multiple spawner, with constant oocytes recruitment all over the reproductive season. The batch fecundity ranged between 749 and 3,207 oocytes for females, and the relative fecundity ranged from 127 to 422 yolked oocytes per female gram (ovary free). The fecundity estimation has been made with yolked oocytes. No correlation between the fecundity estimation and female size and total weight (without ovary) has been found. The estimated L50 values were 74.13 and 73.76 mm TL for females and males, respectively. Shoals of females in advanced maturity phase were recorded, between December to April in the study area. During this period a significant increase of species abundance was correlated with water temperature increase (above 16°C). This fact, together with the detection of post-ovulatory follicles, indicated the existence of reproductive events in the nearby-coastal area of Mar Chiquita coastal lagoon.

scholarly journals Reproductive patterns of bogue, Boops boops (Sparidae), in the southeastern Adriatic Sea

2017 ◽  
Vol 58 (1) ◽  
pp. 117-125
Author(s):  
Tatjana Dobroslavić ◽  
Renata Mozara ◽  
Branko Glamuzina ◽  
Vlasta Bartulović
Keyword(s):  
Total Population ◽  
Adriatic Sea ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Size Class ◽  
Oocyte Diameter ◽  
Allometric Growth ◽  
Monthly Distribution ◽  
Boops Boops

The reproductive characteristics of bogue (Boops boops) in the southeastern Adriatic Sea are presented in this study. The analysis is based on 676 specimens caught by seine net from December 2011 to November 2012. Total length of females ranged from 13.3 to 29.3 cm and males from 15.1 to 26.3 cm. The overall sex ratio of females to males was 1:0.85 (χ2=4.314; P &lt; 0.05) with a slightly higher number of females in the largest size class. Length-weight relationship for the total population indicated negative allometric growth (b=2.911). Values of the condition factor are relatively low for both sexes. Maximum values were recorded in September 1.025 for females and 1.029 for males. Gonadosomatic index and histological examination showed that the spawning season of the bogue in the Adriatic is from January to May with peak in February. Six stages of gonad development were identified: immature, undergoing maturation, ripening, ripe, spawning and spent. The monthly distribution of the different sexual maturity stages and the frequency distribution of oocyte diameter revealed that this species is a batch spawner.

scholarly journals Gonad development and reproductive hormones of invasive silver carp (Hypophthalmichthys molitrix) in the Illinois River

2019 ◽  
Vol 102 (3) ◽  
pp. 647-659
Author(s):  
Emily K Tucker ◽  
Megan E Zurliene ◽  
Cory D Suski ◽  
Romana A Nowak
Keyword(s):  
Silver Carp ◽  
Gonad Development ◽  
Life History Strategy ◽  
High Plasma ◽  
Early Summer ◽  
Reproductive Hormones ◽  
Illinois River ◽  
Plasma Testosterone ◽  
Hypophthalmichthys Molitrix ◽  
Spawning Period

Abstract Reproduction is a major component of an animal’s life history strategy. Species with plasticity in their reproductive biology are likely to be successful as an invasive species, as they can adapt their reproductive effort during various phases of a biological invasion. Silver carp (Hypophthalmicthys molitrix), an invasive cyprinid in North America, display wide variation in reproductive strategies across both their native and introduced ranges, though the specifics of silver carp reproduction in the Illinois River have not been established. We assessed reproductive status using histological and endocrinological methods in silver carp between April and October 2018, with additional histological data from August to October 2017. Here, we show that female silver carp are batch spawners with asynchronous, indeterminate oocyte recruitment, while male silver carp utilize a determinate pattern of spermatogenesis which ceases in the early summer. High plasma testosterone levels in females could be responsible for regulating oocyte development. Our results suggest that silver carp have high spawning activity in the early summer (May–June), but outside of the peak spawning period, female silver carp can maintain spawning-capable status by adjusting rates of gametogenesis and atresia in response to environmental conditions, while males regress their gonads as early as July. The results of this study are compared to reports of silver carp reproduction in other North American rivers as well as in Asia.

SPECIAL FEATURES OF OOCYTE SIZE IN SO-IUY MULLET (PLANILIZA HAEMATOCHEILA TEMMINCK & SCHLEGEL, 1845) IN THE SEA OF AZOV AT THE END OF THE WINTER SEASON, 2019

2020 ◽  
Author(s):  
L.A. Bugaev ◽  
◽  
A.V. Voykina ◽  
S.G. Sergeeva
Keyword(s):  
Winter Season ◽  
Individual Characteristics ◽  
Oocyte Diameter ◽  
Sea Of Azov ◽  
Oocyte Size ◽  
Bioactive Substances ◽  
Spawning Period ◽  
Gonad Maturity ◽  
Individual Specimen

Analysis of special features of the reproductive system of so-iuy mullet Planiliza haematocheila (Temminck & Schlegel, 1845) females from the Azov and Black Sea Basin at the end of the winter season, 2019, has been conducted using the size of oocytes as its basis. Individual differences in distribution of oocyte sizes during the period of trophoplazmatic growth have been identified. Following the estimation of ordered series of oocyte sizes during the period of trophoplazmatic growth, the median and percentile values have been calculated; they can be used as reference values for qualitative characterization of ordered series for oocyte diameter in an individual specimen, using the empirical median, calculated for the respective specimen, as a basis. It has been found out that the sizes of trophoplazmatic growth oocytes, which are utilized during the spawning period of the current year, and, therefore, the degree of gonad maturity have individual characteristics independent of the age of an individual, of its length and weight, and of the content of reserve and bioactive substances in its tissues and blood.

scholarly journals Identification and Expression of vitellogenin gene in the Gouramy (Osphronemous Gourammy) under photoperiods manipulation

2018 ◽  
Vol 47 ◽  
pp. 02001 ◽  
Author(s):  
Norman Arie Prayogo ◽  
Asrul Sahri Siregar ◽  
Purnama Sukardi ◽  
Dewi Nugrayani ◽  
Anandita Ekasanti ◽  
...  
Keyword(s):  
Gene Expression ◽  
Amino Acids ◽  
Reproductive Performance ◽  
External Factor ◽  
Gonad Development ◽  
Gonadal Development ◽  
Endocrine Gland ◽  
Vitellogenin Gene ◽  
Reproductive Cycles ◽  
Experimental Group

Vitellogenin was protein hormone where controlled gonad development in fish. Expression of this gene regulated from the external and internal factor.Photoperiods are the external factor that regulated endocrine gland activities in gonadal development, gametogenesis and reproductive cycles. Aim of the research to find out the effect of photoperiod on gouramy reproductive performance by manipulating photoperiod. Design experimental with three photoperiod treatments, namely 14L: 10D (control), 8L: 16D (short photoperiods) and 18L: 6D (long photoperiods). Four aquaria consisting of nine fishes each were served as replicates. Fishes were kept under these photoperiods for 8 weeks. The observed variable was the liver activities. Liver activity was evaluated by measuring gene expression of Vitellogenin. The normalized data were subjected to ANOVA followed by Tukey’s multiple-comparison tests. The length of Vitellogenin cDNA was 1136 bp. The vitellogenin precursors encoded cDNA consisted of 378 amino acids. The average of vitellogenin gene in each experimental group significantly increased according to longer photoperiods (P<0.05). These results indicated that photoperiods had a stimulatory effect in improving gouramy reproductive performance

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