scholarly journals Reproductive Cycle of Blue-Striped Angelfish, Chaetodontoplus septentrionalis in Jeju Coastal Waters

2021 ◽  
Vol 25 (3) ◽  
pp. 145-155
Author(s):  
Dae-Jong Kim ◽  
Chi-Hoon Lee ◽  
Young-Don Lee
Keyword(s):  
Reproductive Cycle ◽  
Coastal Waters

scholarly journals Dynamic of decapod crustacean larvae on the entrance of Guanabara bay

2002 ◽  
Vol 45 (4) ◽  
pp. 491-498 ◽  
Author(s):  
Lohengrin Dias de Almeida Fernandes ◽  
Sérgio Luiz Costa Bonecker ◽  
Jean Louis Valentin
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Coastal Waters ◽  
Decapod Crustacean ◽  
Late Summer ◽  
Late Winter ◽  
Guanabara Bay ◽  
Tidal Cycles ◽  
Decapod Larvae

In the present study, we observed seasonal variations in the density of decapod larvae as well as changes in density related to diurnal and tidal cycles. Among the decapod larvae collected, portunids and grapsids were the most abundant, especially during nocturnal ebb tides and near the surface. The same results were obtained in late winter (September) and late summer (March). These results demonstrated a flow of decapod larvae from Guanabara Bay to adjacent coastal waters. Luciferid (Lucifer faxoni) was the only group with high densities during flood tides and we suggest this is an evidence of L. faxoni larvae entering Guanabara Bay in late winter. Probably these changes in distribution of Lucifer faxoni among winter and summer were related to reproductive cycle in the bay. For the portunids, grapsids and ocypodids, a similar dispersion strategy was observed towards adjacent coastal waters in the surface during nocturnal ebb tides.

Reproduction in Abra Alba (Wood) and Abra Tenuis (Montagu) (Tellinacea: Scrobiculariidae)

1980 ◽  
Vol 60 (2) ◽  
pp. 465-479 ◽  
Author(s):  
P. Laskaridou Nott
Keyword(s):  
Reproductive Cycle ◽  
Coastal Waters ◽  
Seasonal Changes ◽  
Dominant Species ◽  
Benthic Communities ◽  
Great Abundance ◽  
Indirect Methods ◽  
Histological Techniques ◽  
North West ◽  
Marine Bivalves

Abra alba and Abra tenuis are closely related marine bivalves. They both inhabit similar types of sandy-mud sediments but they prefer different localities. The smaller A. tenuis is found in a few scattered intertidal mudflats, whereas A. alba is more widely distributed and in great abundance in the coastal waters of north-west Europe. The latter can be found at any depth between low-water mark and 80 m (Tebble, 1966; Ansell, 1974) and often forms the dominant species of shallow water benthic communities.The reproductive cycle of the two species has been studied and compared as a part of a wider ecological investigation. There is minimal literature concerning the reproduction of A. tenuis but A. alba has received a lot of attention, because it forms a major source of food for flatfish. However, most of the earlier investigations are confined to the time that spawning occurs with the evidence derived from either the time of the year that larvae appear in the plankton (Lebour, 1938; Jorgensen, 1946; Fosshagen, 1965; Muus, 1973; Rasmusen, 1973), or the time of the year that juveniles first appear in the bottom samples (Orton, 1924; Ford, 1925; Stephen, 1932). The inadequacy of such indirect methods has been discussed by Seed (1969,1975, 1976). Ansell (1974) derived the reproductive cycle of A. alba from seasonal changes in the biochemical composition. In the present investigation, histological techniques have been used, since they are considered to offer the most reliable information about the reproductive cycle (Seed, 1969, 1975, 1976).

Reproductive cycle of Ganus Jischkeanus (Gastropoda: Conidae) in Jeju coastal waters, Korea

2020 ◽  
Vol 54 ◽  
pp. 199-217
Author(s):  
Song-Hee Choi ◽  
Byeong-Hoon Kim ◽  
Sung-Hoon Lee ◽  
Chi-Hoon Lee ◽  
Young-Don Lee
Keyword(s):  
Reproductive Cycle ◽  
Coastal Waters

Reproduction and embryonic development of the blue stingray, Dasyatis chrysonota, in southern African waters

2008 ◽  
Vol 89 (4) ◽  
pp. 809-815 ◽  
Author(s):  
David A. Ebert ◽  
Paul D. Cowley
Keyword(s):  
Life History ◽  
Reproductive Cycle ◽  
Coastal Waters ◽  
Management Strategy ◽  
Eastern Cape Province ◽  
Eastern Cape ◽  
Annual Reproductive Cycle ◽  
Life History Characteristics ◽  
Disc Width ◽  
Over Exploitation

Dasyatis chrysonota is perhaps the most common of the 14 whiptail stingray (Chondrichthyes: Dasyatidae) species known to frequent the temperate coastal waters of southern Africa and like other stingrays they possess life history characteristics that make them vulnerable to over-exploitation. First and 50% maturity (Dw50) were determined for 153 males and 204 females from the Eastern Cape Province of South Africa. Disc width (Dw) for first and Dw50 maturity was estimated at 392 mm and 395 mm Dw, respectively for males and at 500 mm and 505 mm Dw, respectively for females. The reproductive cycle of males, based on gonadosomatic (GSI) and hepatosomoatic (HSI) indices indicates that they are most active during the spring. Females appear to have an annual reproductive cycle with a maximum HSI occurring during the summer and autumn, but it declines steadily through the birthing season reaching a low in the late spring. Fecundity, following a nine month gestation period, averages 2.8 with a range of 1–7. Embryos at six different development stages are described. Dasyatis chrysonota, like other dasyatids, exhibit life history characteristics that make them vulnerable to overexploitation, therefore a precautionary management strategy is advised for this species.

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