Reproduction and annual gametogenic cycle in Nephtys hombergii and N. caeca (Polychaeta: Nephtyidae)

1978 ◽  
Vol 46 (1) ◽  
pp. 83-90 ◽  
Author(s):  
P. J. W. Olive
Keyword(s):  
Gametogenic Cycle ◽  
Annual Gametogenic Cycle

The gametogenic cycle and spawning in Mytilus edulis in two fjords in north-western Iceland

2013 ◽  
Vol 93 (6) ◽  
pp. 1609-1615 ◽  
Author(s):  
Gudrun G. Thorarinsdóttir ◽  
Hafsteinn G. Gudfinnsson ◽  
Svanhildur Egilsdóttir ◽  
Jón Örn Pálsson
Keyword(s):  
Mytilus Edulis ◽  
Blue Mussel ◽  
Gonad Development ◽  
Early Spring ◽  
Early Winter ◽  
Gametogenic Cycle ◽  
Summer Maximum ◽  
Annual Gametogenic Cycle ◽  
Short Time ◽  
North Western

The annual gametogenic cycle in the blue mussel, Mytilus edulis L. was investigated from May 2010 to May 2011 in two locations in north-western Iceland. Food availability (chlorophyll-a) was high in early spring at both sites, with a summer maximum in July in Steingrimsfjördur but an autumn maximum in September in Patreksfjördur. Gonad development started in November at both sites, with ripe gametes still visible in the follicles, and continued throughout the year, except for a very short time prior to spawning in Steingrimsfjördur. Gametes developed mostly between November and May. Spawning was protracted, lasting from July to early winter at both sites. The main spawning events occurred from August (11.7°C) to October (9.4°C) in Patreksfjördur, but from July (9.8°C) to October (8.6°C) in Steingrimsfjördur

Growth and sexual reproduction in the scleractinian coral Montipora digitata (Dana)

1985 ◽  
Vol 36 (3) ◽  
pp. 441 ◽  
Author(s):  
AJ Heyward ◽  
JD Collins
Keyword(s):  
Growth Rate ◽  
Sexual Reproduction ◽  
Scleractinian Coral ◽  
Maximum Rate ◽  
Linear Extension ◽  
Colony Growth ◽  
External Fertilization ◽  
Gametogenic Cycle ◽  
Annual Gametogenic Cycle ◽  
First Time

Colony growth rate and sexual reproduction in M. digitata were quantified. Growth rate was expressed in terms of branch linear extension, with a maximum rate of 30.5 mm year-1 for the population. Gametogenesis and spawning were recorded for the first time. M. digitata has an annual gametogenic cycle followed by a brief spawning event where gametes are shed into the water before external fertilization and embryogenesis.

Annual gametogenic cycle of the freshwater pearl mussel, Lamellidens marginalis (Lamarck, 1819) collected from a perennial lentic habitat of Bangladesh

2019 ◽  
Vol 40 (1) ◽  
pp. 36-43 ◽  
Author(s):  
M. Abubakar Siddique ◽  
M. Asha Khatun ◽  
M. Mashiur Rahman ◽  
Gias Uddin Ahmed ◽  
Mohammad Moniruzzaman ◽  
...  
Keyword(s):  
Pearl Mussel ◽  
Freshwater Pearl Mussel ◽  
Gametogenic Cycle ◽  
Annual Gametogenic Cycle

Gametogenic cycle of the tropical vermetids Eualetes tulipa and Dendropoma corrodens (Mollusca: Caenogastropoda: Vermetidae)

2009 ◽  
Vol 90 (3) ◽  
pp. 509-518 ◽  
Author(s):  
Patricia Miloslavich ◽  
Eduardo Klein ◽  
Pablo Penchaszadeh
Keyword(s):  
Body Length ◽  
Total Body Length ◽  
Body Volume ◽  
Gametogenic Cycle ◽  
Southern Caribbean ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
Total Body ◽  
Total Body Volume ◽  
Annual Gametogenic Cycle

The population density, annual gametogenic cycle, and size at sexual maturity of two vermetid species, Eualetes tulipa (invasive) and Dendropoma corrodens was studied in the southern Caribbean at the Planta Centro power plant intake channel and at Punta Mayorquina, Morrocoy National Park, respectively. Minimal size of mature females of E. tulipa and D. corrodens was 5.0 and 0.7 cm in body length respectively. The gonad represented between 44 to 47% of total body length, while it represented between 15 to 18% of total body volume (for both males and females). Gonad volume was significantly related to total body volume. A significant quadratic relationship between the number of capsules and female body volume was obtained for E. tulipa, indicating that females measuring 6–10 cm in body length are those that have the highest number of egg capsules. Females larger than 11 cm have a lower fecundity in terms of brooded capsules. Gonad sections of males and females of both species showed that several gametogenesis stages are simultaneous within the same individual. In the female, germ cells, oogoniums and primary oocytes with yolk granules were observed simultaneously. In the male, the spermatogonium, primary and secondary spermatocytes, spermatids and sperm cells were also observed within one gonad. The same pattern was observed throughout the year, showing no maturation/resting period or annual cycle. The area covered by D. corrodens was about 700 m2 with a mean density of 13,000 ind/m2. The area covered by the invasive E. tulipa was at least about 1000 m2, with a density of 27,000 to 29,000 ind/m2 in the first 3 m of depth. A follow up of the E. tulipa population showed that its density is increasing in time and has doubled in 20 years. This population increment could be related to an increase in organic suspended matter as evidenced in the region.

Annual gametogenic cycle in ocean quahog, Arctica islandica from north-western Iceland

2000 ◽  
Vol 80 (4) ◽  
pp. 661-666 ◽  
Author(s):  
Gudrun G. Thorarinsdóttir
Keyword(s):  
Shell Length ◽  
Active Phase ◽  
Spawning Activity ◽  
Arctica Islandica ◽  
Histological Techniques ◽  
Gametogenic Cycle ◽  
Near Shore ◽  
Annual Gametogenic Cycle ◽  
Five Phases ◽  
North Western

Annual gametogenic cycle in ocean quahog, Arctica islandica, was investigated using specimens collected regularly from a near shore population in north-western Iceland from December 1997 to November 1998. Gonads from 450 adult quahogs with shell length ranging from 65 to 106 mm were examined after being prepared by standard histological techniques. Observed gametogenic progression was categorized by five phases: (EA) early active; (LA) late active; (R) ripe; (PS) partially spent; (S) spent. All phases of the gametogenic cycle were present in the samples all the year around except in May and June when no spent individuals were seen, and in June and July when no individuals in the early active phase were observed. Morphologically ripe specimens predominated in the samples from May until August when partially spawned individuals dominated the population and did so until February. Spawning activity as inferred from the histological examination appears to be all the year around but most intense from June until August.

Stereological studies on the gametogenic cycle of the scallop, Pecten maximus, in suspended culture in Ria de Arousa (Galicia, NW Spain)

Aquaculture ◽  
1996 ◽  
Vol 142 (1-2) ◽  
pp. 119-135 ◽  
Author(s):  
Antonio J. Pazos ◽  
Guillermo Román ◽  
Carmen P. Acosta ◽  
Marcelina Abad ◽  
JoséLuis Sánchez
Keyword(s):  
Pecten Maximus ◽  
Nw Spain ◽  
Suspended Culture ◽  
Gametogenic Cycle

The gametogenic cycle of Octopus vulgaris (Mollusca: Cephalopoda) as observed on the Atlantic coast of Andalusia (south of Spain)

2005 ◽  
Vol 147 (4) ◽  
pp. 927-933 ◽  
Author(s):  
A. Rodríguez-Rúa ◽  
I. Pozuelo ◽  
M. A. Prado ◽  
M. J. Gómez ◽  
M. A. Bruzón
Keyword(s):  
Atlantic Coast ◽  
Octopus Vulgaris ◽  
Gametogenic Cycle
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