Reproductive cycle and spawning rhythm of the ascidian,<i>Halocynthia hilgendorfi ritteri</i>

Choi, Youngjin; Lee, Chi‐Hoon; Rho, Sum; Lee, Young‐Don

doi:10.1080/12265071.2004.9647731

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…The result is well in concordance with that obtained by Thiyagarajan and Qian (2003). Choi et al (2004) reported that the early developmental stage took 20.5 h from fertilized eggs to hatch at 21.0±0.5 °C. The results coincide with our results from 19 to 21 °C.…”

Section: Discussionsupporting

confidence: 93%

“…Although many research efforts have been made to study the physiology of sea squirt, these studies focus on H. roretzi including spawning (Hirai 1963; Pyen, Rho & Chang 1977), larval attachment (Park, Rho, Lee & Lee 1991), shape transformation (Numakunai 1968; Cloney 1982) and early growth (Jang 1979). There are few reports referred to H. ritteri , and the study about the influence of temperature on H. ritteri is only limited to the early growth (Choi, Lee, Rho & Lee 2004).…”

Section: Introductionmentioning

confidence: 99%

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Influence of water temperature on spawning induction and larval development of the sea squirtHalocynthia ritteri(Oka, 1906)

Kang

Zhang

Bao

et al. 2009

Aquaculture Research

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In order to establish a large-scale hatchery technique for the sea squirt Halocynthia ritteri, the in£uences of water temperature on spawning induction, larval development and survival of H. ritteri were studied under laboratory conditions. The larvae of H. ritteri exhibited high sensitivity to changes in temperature. As temperature increased from10 to 21 1C, the duration of larval stage was inversely related to temperature and the time to reach attached larvae stage decreased from 42.0 to 59.4 h. The biological minimum temperature for the early development of H. ritteri was estimated to be 0.22 1C. In relation to temperature, quadratic equations showed signi¢cant ¢ts to the data of spawning rate, fecundity, fertilization, larval survival and attachment. Optimal temperatures for spawning rate, fecundity, fertilization rate, larval survival rate and attachment rate were estimated to be 14.9, 14.7, 13.2, 14.1 and 14.7 1C respectively. It is concluded that the range of 13^15 1C is optimal for spawning and larval rearing of sea squirts. Aquaculture Research, 2009, 40, 513^518 In£uence of water temperature on sea squirt K H Kang et al.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Influence of water temperature on spawning induction and larval development of the sea squirtHalocynthia ritteri(Oka, 1906)

Kang

Zhang

Bao

et al. 2009

Aquaculture Research

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“…Oocytes at several different developmental stages were observed in a single individual, indicating that the tunicate specimens analyzed in this study have an asynchronous type of ovary development (Figure 1(C) & 1(F)). These results suggested that S. plicata has a protracted spawning period with multiple spawning (Mukai 1977), as similarly seen in Halocynthia hilgendorfi ritteri (Choi et al 2004). Based on the histological features, oocyte differentiation stages were classified into four phases including oogonia proliferation phase, primary growth phase, secondary growth phase, and post-ovulatory phase.…”

Section: Resultssupporting

confidence: 62%

“…These features suggest that our S. plicata specimens were in the spawning season, although this assumption requires further studies. Previous reproductive cycle observations have shown some tunicate species such as H. hilgendorfi ritteri (Choi et al 2004) and Polycarpa cryptocarpa kroboja (Chen & Dai 1998) to be generally multiple spawners, where spawning are controlled by several factors especially the lunar phase and temperature (Choi et al 2004).…”

Section: Post-ovulatory Phasementioning

confidence: 99%

Oocyte Differentiation and Reproductive Health of Solitary Tunicate (Styela plicata) from Eastern Coast of Thailand

Senarat¹,

Kettratad²,

Boonyoung³

et al. 2021

JSM

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Histopathological examination is a widely acknowledged technique to assess the reproductive health of aquatic organisms, but it has never been applied to the tunicate Styela plicata, a potential indicator species of water quality. In this study, we examined the oocyte differentiation of S. plicata obtained from the eastern coast of the Gulf of Thailand in order to provide basic information for future assessment of its reproductive health. The mature gonad of S. plicata comprised several ovo-testicular convoluted tubes, in which each tube was divided into apical and terminal portions. The ovarian tissue is located in the apical part of the tunicate body and contained oocytes of various differentiation stages (asynchronous development type) consisting of the four phases namely oogonial proliferation phase, primary growth phase, secondary growth phase (secondary growth and full-growth stages), and post-ovulatory phase. Changes in the morphology of oocytes and follicular cells were described for each differentiation stage. In addition, we unexpectedly observed a high prevalence of atretic follicles (24.5%), which might indicate the oocyte damage by environmental stresses. These findings would be useful for future assessment of reproductive histology of S. plicata and other tunicate species from environmental perspectives.

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“…It is native to Asia and occurs off the coast of Jeju Island, Korea (Oka 1906 ; Tokioka 1959 ; Choi, Lee, et al. 2004 ). Halocynthia hilgendorfi ritteri is found mainly on rock surfaces and its shape and color are similar to those of the surrounding rocks (Choi, Kim, et al.…”

mentioning

confidence: 99%

Complete mitochondrial genome of Halocynthia hilgendorfi ritteri (Pyuridae) from Korea

Kim

Kim²,

Kim

et al. 2020

Mitochondrial DNA Part B

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Halocynthia hilgendorfi ritteri is an ascidian distributed on the coast of Geoje Island in Korea and found on rocks. The mitochondrial genome of Halocynthia hilgendorfi ritteri consists of 15,181 bp with 13 protein-coding genes, 2 ribosomal RNAs, 23 transfer RNA genes. The overall base composition of the complete genome is 22.94% A, 43.32% T, 25.72% G, and 8.02% C, with a high A þ T content of 66.26%.

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Reproductive cycle and spawning rhythm of the ascidian,Halocynthia hilgendorfi ritteri

Cited by 8 publications

References 10 publications

Influence of water temperature on spawning induction and larval development of the sea squirtHalocynthia ritteri(Oka, 1906)

Influence of water temperature on spawning induction and larval development of the sea squirtHalocynthia ritteri(Oka, 1906)

Oocyte Differentiation and Reproductive Health of Solitary Tunicate (Styela plicata) from Eastern Coast of Thailand

Complete mitochondrial genome of Halocynthia hilgendorfi ritteri (Pyuridae) from Korea

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