On the Development of the Japanese Eel, Anguilla japonica

Yamamoto, Kayoko; Yamauchi, Kouhei; Kasuga, Seiichi

doi:10.2331/suisan.41.21

Cited by 25 publications

(38 citation statements)

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“…The presence of a subgerminal cavity during the embryonic period has been reported in longnose gar Lepisosteus osseus [33], Amia calva [34], whitefish Coregonus clupeaformis [35], and stickleback Gasterosteus aculeatus [36], but not in any clupeids. However, the development of a blastocoel has been reported in the Japanese eel Anguilla japonica [37], rainbow trout Onchorhynchus masou [38], and Cynolebias viarius [39], but it is not obvious in American shad [23], and is absent in zebrafish [21]. Although Collazo et al [40] reviewed and compared the gastrulation of teleosts from a phylogenetic viewpoint, to what extent the subgerminal cavity and the blastocoel is present in the teleost lineage has not been reviewed comprehensively.…”

Section: Discussionmentioning

confidence: 94%

Embryonic development and morphology of eggs and newly hatched larvae of Pacific herring Clupea pallasii

et al. 2011

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The embryonic development and morphology of eggs and newly hatched larvae of the Pacific herring Clupea pallasii were described using laboratory-reared specimens originating from the Miyako Bay stock. The eggs were almost spherical in shape, 1.33-1.46 mm (mean: 1.38 mm) in diameter, and had a thick adherent chorion. They had a segmented pale yellow yolk, no oil globule, and a relatively wide perivitelline space. A subgerminal cavity was observed during the gastrula period, whereas the blastocoel did not appear. Mass hatching occurred by 271 h 45 min after fertilization, and the newly hatched larvae were 7.1-7.7 mm (mean: 7.5 mm) in total length with 53-56 myomeres at 9.6°C. The embryonic development of Pacific herring was substantially similar to that of zebrafish Danio rerio, American shad Alosa sapidissima, as well as Atlantic herring Clupea harengus, and generally followed the basic developmental pattern of teleosts. However, Pacific herring larvae hatched at a more developed stage than some other clupeoids, such as Japanese sardine Sardinops melanostictus, and the progressed developmental stage at hatching could be interpreted as an advanced adaptation.

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Section: Discussionmentioning

confidence: 94%

Embryonic development and morphology of eggs and newly hatched larvae of Pacific herring Clupea pallasii

et al. 2011

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“…anguilla (46^48 h, Prokhorchik et al 1987). The larvae measured c. 2.5 mm in total length, which corresponds to values given for A anguilla (2.5-2.7 mm, Prokhorchik 1986), but is somewhat smaller than those for A. japonica (2.9 mm, Yamamoto & Yamauchi 1974;Yamamoto et al 1975). Similarly, A. japonica larvae were considerably larger than those from A. australis or A. australis x A. dieffenbachii on consecutive days post-hatching, which may be partly explained by differences in incubation temperature.…”

Section: Discussionmentioning

confidence: 99%

“…Eggs developed as described for the Japanese (Yamamoto & Yamauchi 1974;Yamamoto et al 1975;Yamamoto 1981) and European eel (Prokhorchik et al 1987). In brief, lipid droplets fused after seawater activation, yielding a single oil drop after c. 2 h (Fig.…”

Section: Induction Of Vitellogenesis Final Maturation and Spawningmentioning

confidence: 99%

“…However, despite the availability of artificially matured male and female eels, the life cycle of anguillids has still not been completed in captivity. Indeed, researchers have successfully fertilised and hatched eggs of Japanese (A. japonica; e.g., Yamamoto & Yamauchi 1974;Yamamoto et al 1975;Tanaka et al 1995) and European eels (Prokhorchik 1986), but larvae never survived for more than a few weeks, possibly as a result of aberrant yolking or lack of appropriate food (Yamauchi & Yamamoto 1982;Kurokawa et al 1995).…”

Section: Introductionmentioning

confidence: 99%

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Induced spawning and early ontogeny of New Zealand freshwater eels{Anguilla dieffenbachiiandA. australis)

Lokman

Young

2000

New Zealand Journal of Marine and Freshwater Research

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Knowledge on the reproductive biology of New Zealand freshwater eels (Anguilla australis Richardson and A. dieffenbachii Gray) is limited to changes associated with gametogenesis in the adults; details pertaining to embryonic and larval development are not available, but are of obvious benefit for a better understanding of the eel life history and for artificial propagation programmes, whether for aquaculture or conservation purposes. Therefore, eels were artificially matured and eggs fertilised with sperm from either species to investigate early ontogeny. Only eggs from A. australis hatched successfully after c. 45 h of incubation at room temperature, yielding larvae of c. 2.5 mm in length. Larvae survived for up to 5 days, by which time they had attained a length of 5.3 mm. Scanning electron microscopy of 1-and 2-day-old larvae revealed the presence of prominent free neuromasts on the head and along the flanks. Although hatching of New Zealand eels was achieved for the first time, it is strongly recommended that hormone treatment be initiated immediately following capture, well before ovarian atresia starts.

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“…1). Indeed, the reported collection of an American eel A. rostrata egg near Bermuda by Fish [9] was later rejected by Yamamoto et al [10], because of inconsistencies in the morphological characters compared with artificially obtained A. japonica eggs. Similarly for A. japonica, three eggs collected in 1998 were found to be of another species, despite their morphological characteristics being quite similar to those of artificially produced eggs [11].…”

Section: Introductionmentioning

confidence: 98%

Genetic identification and morphology of naturally spawned eggs of the Japanese eel Anguilla japonica collected in the western North Pacific

et al. 2011

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Eggs of the Japanese eel Anguilla japonica collected in the western North Pacific were identified by onboard species-specific polymerase chain reaction (PCR) and DNA nucleotide sequencing after the cruise. Fish eggs of various species were collected by large plankton net tows at 12 stations along the southern part of the West Mariana Ridge on 19-25 May 2009. A total of 43 fish eggs were distinguished morphologically as possibly being of A. japonica. Thirty-one of those were analyzed by PCR, which included 15 eggs collected at 12°50-55 0 N, 141°15-20 0 E (in 5 tows) that showed positive results. The 16S ribosomal RNA (rRNA) gene sequences of eggs determined after the cruise indicated that 31 A. japonica eggs had been collected. The remaining eggs were of mesopelagic eel species (Serrivomeridae and Derichthyidae), or unidentified species. The morphological characteristics of the A. japonica eggs were consistent with those of artificially spawned eggs, except they had a slightly larger diameter. The egg diameter range did not overlap with those of mesopelagic eels of the Serrivomeridae, which often spawn in the same area as A. japonica. These results suggest that egg diameter and embryo shape can be used to morphologically identify naturally spawned A. japonica eggs.

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On the Development of the Japanese Eel, Anguilla japonica

Cited by 25 publications

References 0 publications

Embryonic development and morphology of eggs and newly hatched larvae of Pacific herring Clupea pallasii

Embryonic development and morphology of eggs and newly hatched larvae of Pacific herring Clupea pallasii

Induced spawning and early ontogeny of New Zealand freshwater eels{Anguilla dieffenbachiiandA. australis)

Genetic identification and morphology of naturally spawned eggs of the Japanese eel Anguilla japonica collected in the western North Pacific

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