Reproductive biology of Japanese gizzard shad (Nematalosa japonica) in coastal waters around Okinawa Island, Ryukyu Archipelago, southwestern Japan

2012 ◽  
Vol 59 (4) ◽  
pp. 314-322 ◽  
Author(s):  
Masato Uehara ◽  
Katsunori Tachihara
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Gizzard Shad ◽  
Ryukyu Archipelago ◽  
Okinawa Island

Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters

Zootaxa ◽  
2009 ◽  
Vol 2114 (1) ◽  
pp. 50-60 ◽  
Author(s):  
YUZO OTA ◽  
EUICHI HIROSE
Keyword(s):  
Great Barrier Reef ◽  
Coastal Waters ◽  
New Record ◽  
Barrier Reef ◽  
Ryukyu Archipelago ◽  
Okinawa Island ◽  
Wide Range

Gnathia maculosa sp. nov. is described from males reared in a laboratory from larvae that were collected as ectoparasites on elasmobranchs, caught off Okinawa Island in the Ryukyu Archipelago, southwestern Japan. The species is most similar to G. trimaculata but it is distinguished from G. trimaculata by deeper and narrower dorsal sulcus, a narrower body, and the wider pylopod. Gnathia trimaculata, previously recorded from Great Barrier Reef, Australia, was also collected from elasmobranchs caught off Okinawa Island. The record of G. trimaculata from Okinawa indicates a wide range of the distribution of the gnathiids inhabiting elasmobranchs.

Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan

Zootaxa ◽  
2009 ◽  
Vol 2238 (1) ◽  
pp. 43-55 ◽  
Author(s):  
YUZO OTA ◽  
EUICHI HIROSE
Keyword(s):  
Great Barrier Reef ◽  
Coastal Waters ◽  
New Record ◽  
Barrier Reef ◽  
Ryukyu Archipelago ◽  
Female Adult ◽  
Okinawa Island ◽  
Male And Female

Gnathiid larvae were collected as ectoparasites on elasmobranchs caught in fisheries off Okinawa Island, Ryukyu Archipelago, southwestern Japan. The larvae were reared in a laboratory aquarium; some metamorphosed into male and female adults of Gnathia nubila n. sp. and Gnathia grandilaris Coetzee, Smit, Grutter & Davies, 2008. Males of G. nubila n. sp. were easily distinguished from all other species by the bifit and dentate mediofrontal process of the frontal border and by a narrow pleotelson. Gnathia grandilaris was originally recorded from the Great Barrier Reef (GBR), Australia, and here we report a second find of this species from the Ryukyus. Since the first description did not include female adult of G. grandilaris, we provide the morphology of female.

Reproductive biology of Sillago aeolus in Okinawa Island, Japan

2005 ◽  
Vol 71 (1) ◽  
pp. 122-132 ◽  
Author(s):  
Md Habibur RAHMAN ◽  
Katsunori TACHIHARA
Keyword(s):  
Reproductive Biology ◽  
Okinawa Island ◽  
Sillago Aeolus

scholarly journals Reproductive Biology of Round Sardinella (Sardinella Aurita) (Valenciennes, 1847) in Senegalese Coastal Waters

2018 ◽  
Vol 9 (1) ◽  
pp. 31
Author(s):  
Ismaïla NDIAYE ◽  
Alassane SARR ◽  
Alioune FAYE ◽  
Modou THIAW ◽  
Malick DIOUF ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Coastal Waters ◽  
Sexual Maturity ◽  
Reproductive Parameters ◽  
Monthly Variation ◽  
Relative Fecundity ◽  
The Mean ◽  
Sardinella Aurita ◽  
Somatic Index

In this study, a total of 1068 specimens Sardinella aurita of which 553 females and 515 males were examined. The objectif of this study was to determine the reproductive parameters of Sardinella aurita. The sex ratio was significantly in favor of females (55%). The size at first sexual maturity was estimated at 18.9 cm for females and 18.0 cm for males. The monthly variation of sexual maturity stages and gonado-somatic index (GSI) allowed to locate the reproduction periods from February to June and from September to December. The mean absolute fecundity was estimated at 110.794 ± 7582 oocytes whereas relative fecundity was about 422 ± 26 oocytes per gram of female.

scholarly journals Uterine fluid composition of the dwarf ornate wobbegong shark (Orectolobus ornatus) during gestation

2011 ◽  
Vol 62 (6) ◽  
pp. 576 ◽  
Author(s):  
Megan T. Ellis ◽  
Nicholas M. Otway
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Reproductive Strategies ◽  
Yolk Sac ◽  
Gestation Period ◽  
Fluid Composition ◽  
Complex Composition ◽  
Eastern Australia ◽  
Uterine Fluid ◽  
Low Levels

Low fecundity in chondrichthyans makes them extremely susceptible to fishing, so understanding the various reproductive strategies in this group is vital for management. Knowledge of the uterine fluid (UF) composition throughout gestation is fundamental to this understanding, yet is restricted to a few species. This study focussed on the UF composition of the wobbegong (Orectolobus ornatus), which inhabits coastal waters off eastern Australia. The UF was quantified throughout pregnancy. Fluids surrounding uterine eggs had a complex composition, with mean urea (98.48 mmol L–1), sodium (560.25 mmol L–1) and potassium (13.93 mmol L–1) concentrations significantly greater than those in seawater. A change in composition, from complex to simple, occurred after 3–4 months gestation. Major electrolyte concentrations then resembled seawater for the remainder of gestation, suggesting the flushing of the uteri with seawater and evidenced by fluctuating low levels of urea. The gestation period reflected the time for metabolism of yolk stores, osmotic and ionic adjustment, development of functioning immunological systems and prevention of external yolk sac damage. Our study is the first documentation of UF composition for a wobbegong shark and increases understanding of its reproductive biology.

scholarly journals Reefal microbial crusts found in Middle Holocene reef from Okinawa Island, the Ryukyu Archipelago

2020 ◽  
Vol 22 (1) ◽  
pp. 9-25
Author(s):  
Kazuhiko FUJITA ◽  
Toru SASAKI ◽  
Sho KOYANO ◽  
Masaaki CHINEN ◽  
Chuki HONGO ◽  
...  
Keyword(s):  
Ryukyu Archipelago ◽  
Okinawa Island ◽  
Middle Holocene ◽  
Holocene Reef ◽  
Microbial Crusts

scholarly journals Reproductive Biology of Ovigerous Female Emerita emeritus (Crustacea, Decapoda) in Bengkulu Coastal Waters, Indonesia: Egg Production and Reproductive Output

2016 ◽  
Vol 74 (3) ◽  
pp. 103-109 ◽  
Author(s):  
Ouratul Edritanti ◽  
Achmad Farajallah ◽  
Yusli Wardiatno
Keyword(s):  
Embryonic Development ◽  
Surface Temperature ◽  
Reproductive Biology ◽  
Coastal Waters ◽  
Egg Production ◽  
Reproductive Output ◽  
Ovigerous Female ◽  
Abundant Species ◽  
Sea Surface ◽  
Egg Volume

Abstract Emerita emeritus is an abundant species in Bengkulu coastal waters, but the knowledge of its reproductive biology is poor. The present study was conducted to elucidate the reproductive aspects of ovigerous female E. emeritus, including fecundity, egg volume and reproductive output. This study was conducted between January 2015 and January 2016 in Bengkulu coastal waters, Indonesia. Samples were collected manually using shovels and hands. The results showed that ovigerous females occurred every month. Fecundity increased significantly in ovigerous females proportional to the size. No correlation was shown between sea surface temperature and egg production. Fecundity and reproductive output decreased throughout the embryonic development.

Himaloconnus Franz and Nogunius gen. n. of Japan (Coleoptera: Staphylinidae: Scydmaeninae)

Zootaxa ◽  
2020 ◽  
Vol 4822 (3) ◽  
pp. 334-360
Author(s):  
PAWEŁ JAŁOSZYŃSKI
Keyword(s):  
Identification Key ◽  
Ryukyu Archipelago ◽  
Okinawa Island ◽  
New Subspecies ◽  
Ishigaki Island ◽  
Morphological Differences ◽  
Izu Islands

Two genera of Euconnus-like Stenichnini are reported to occur in Japan: Himaloconnus Franz, 1979 and Nogunius gen. n. Specimens of Himaloconnus collected on islands of the Ryukyu archipelago are identified as H. klapperichianus (Franz), previously known to inhabit Taiwan, but morphological differences were found among disjunctive populations and in consequence three new subspecies are proposed: H. klapperichianus yaeyamanus ssp. n. (Yaeyama Islands), H. klapperichianus amamianus ssp. n. (Amami-Ôshima), and H. klapperichianus okinawanus ssp. n. (Okinawa Island). Morphological structures of Japanese Himaloconnus are illustrated in detail and the diagnosis of this genus is emended, to exclude variable characters. Nogunius gen. n. is established to accommodate four species known only from Japan: N. sokani sp. n. (Okinawa Island), N. aogashimanus sp. n. (Aogashima, Izu Islands), N. kerri sp. n. (Ishigaki Island), and N. fukuuzanus sp. n. (Okinawa Island). Identification key to Japanese genera of Stenichnini is updated. 

Sign in / Sign up

Export Citation Format

Share Document