Histological Observations on the Ovaries of Two Species of Taeniosomatous Fishes (Lampridiformes) Caught in Waters Adjacent to the Japanese Main Island

Honma, Yoshio; Ushiki, Tatsuo; Hashizume, Hiroya; Takeda, Mahito; Misaki, Hiroshi; Inagi, Akihiro; Ishibashi, Tomoko

doi:10.5134/176314

Cited by 2 publications

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“…The anteriormost ends of the right and left ovaries were independent structures (11% of June, 9% of Sept. total length of ovarian structure), while the right and left ovaries were tightly held together by connective tissue (41% of June, 39.8% of Sept. total length of ovarian structure). Combined, these data are similar to the descriptions of Honma et al (). Given the two sexually immature oarfish collected in Japan were much smaller in size (i.e., 2.92 m and 2.65 m TL) compared to the two sexually mature females in collected in 2015 (i.e., 4.32 m and 5.20 m TL), the ovaries may become fused during development.…”

Section: Discussionsupporting

confidence: 90%

“…Compared to the reproductive data available on male oarfish, there is considerable understanding of the bifurcated ovary and oogenesis in the female oarfishes. Honma et al () described the fused ovaries of two R. russellii collected in the Sea of Japan. The bifurcated ends of the ovaries comprised approximately 46%–50% of the total ovarian length of the two fish (Honma et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Honma et al () described the fused ovaries of two R. russellii collected in the Sea of Japan. The bifurcated ends of the ovaries comprised approximately 46%–50% of the total ovarian length of the two fish (Honma et al, ). In this study, we further investigated the fusion of the ovaries.…”

Section: Discussionmentioning

confidence: 99%

“…A handful of observations of female oarfish have provided insights into the structure of the ovary. Oarfish have elongated ovaries that are bifurcated (Nishimura, ; Honma et al, ). Cross‐sectional observations have determined the oarfish ovary to be of the entovarian type, that is, a hollow ovary with a central lumen into which ovulated ova enter before released into the environment (Lombardi, ; Honma et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Oarfish have elongated ovaries that are bifurcated (Nishimura, ; Honma et al, ). Cross‐sectional observations have determined the oarfish ovary to be of the entovarian type, that is, a hollow ovary with a central lumen into which ovulated ova enter before released into the environment (Lombardi, ; Honma et al, ). The ovary has polymodal oocytes and the diameter of immature oocytes and ovulated ova within the lumen of the ovary have been documented (Nishimura, ; Saloman et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive Morphology of Oarfish (Regalecus russellii)

Forsgren

Jamal

Barrios

et al. 2017

The Anatomical Record

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Reproduction is a critical aspect of understanding the biology of fishes. Relatively little is known about oarfish (Regalecus russellii) reproduction; however, strandings of dead animals have provided a rare opportunity to investigate the gonadal morphology of four fish: two females and two males. A female collected in June 2015 (4.32 m TL) had bifurcated ovaries 2.14 m in length and 2.14 kg. The gonadosomatic index (GSI) was 11.8% and the fish was determined to be spawning capable/spawning reproductive phase. A female that stranded in Sept. 2015 (5.20 m TL) had bifurcated ovaries 1.43 m in length and 1.28 kg with a GSI of 1.55%. The Sept. female was in a regressing phase of reproduction. A male collected in Aug. 2015 (4.30 m TL) had 64.7-cm-long testes that weighed 40.1 g. The GSI was 0.05% representing a regressing phase of reproduction. A male collected in Nov. 2015 (4.10 m TL) had testes 104.0 cm in length and 467.0 g with a GSI of 0.59%. The Nov. male was in a spawning/spawning capable phase of reproduction. We described ovarian follicles and sperm cells based on size classes and cytological characteristics. We concluded that oarfish are likely batch spawners that undergo periods of regression after a spawning event or season. While this study is not complete with respect to the annual reproductive cycle of oarfish, it markedly contributes to our overall understanding of this rare, mesopelagic fish. Anat Rec, 300:1695-1704, 2017. © 2017 Wiley Periodicals, Inc.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reproductive Morphology of Oarfish (Regalecus russellii)

Forsgren

Jamal

Barrios

et al. 2017

The Anatomical Record

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Histological Studies on Some Organs of Two Male Dealfishes, Trachipterus ishikawae, Caught on the Beach of Shirahama, Wakayama Prefecture, Pacific Coast of Japan

Honma¹,

Ushiki²,

Takeda³

et al. 2005

Publ. SMBL

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The testis, thyroid, kidney, exocrine pancreas, endocrine pancreas (=Brockmann body), spleen and liver of two dealfishes, Trachipterus ishikawae, collected on the beach of Shirahama, Wakayama Prefecture, Pacific coast of Honshu, Japan, were examined histologically. The specimens measured 2.30 m (specimen A) and 1.65 m (specimen B) in total length. The testicular lobes were atrophied and sclerotized, having the appearance of an aggregation of numerous protuberances (or spherules), each spherule corresponding to a lobule containing a number of cysts, although some of the latter had collapsed and/or merged with each other. Each cyst contained sperms and spermatids, relict sperms being found in the spermiduct. The thyroid gland, an amorphously soft body, located dorsally on the ventral aorta and its afferent branchial arteries, was composed of many variously-sized follicles. Each follicle comprised a large amount of smooth colloid, surrounded by a flat epithelium consisting of cubic cells. The overall condition indicated an inactive state. In the kidney, a great deal of stromatous tissue, including AF positive lipid grains, and a small number of glomeruli were apparent. In both specimens, the thread-like loose connective tissue comprising the exocrine pancreas attached to and running parallel with the liver, stomach, Brockmann body and spleen, were composed of acini with zymogen-rich pyramidal cells. Details of cell types in the Brockmann body were difficult to determine. Fatty deposits were absent from the liver of specimen A, which was characterized by rich stromatous tissue and dilated sinusoids. However, rich fatty deposits were found in several portions of the liver of specimen B. Well-developed stromatous tissue and nodules of red-and white pulps were recognized. It was concluded that the two specimens were spent and debilitated males.

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Histological Observations on the Ovaries of Two Species of Taeniosomatous Fishes (Lampridiformes) Caught in Waters Adjacent to the Japanese Main Island

Cited by 2 publications

References 0 publications

Reproductive Morphology of Oarfish (Regalecus russellii)

Reproductive Morphology of Oarfish (Regalecus russellii)

Histological Studies on Some Organs of Two Male Dealfishes, Trachipterus ishikawae, Caught on the Beach of Shirahama, Wakayama Prefecture, Pacific Coast of Japan

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