DNA identification and seasonal changes of pelagic fish eggs in Hiroshima Bay

Kawai, Kentaro; Okazaki, Ryuma; Tomano, Satoshi; Umino, Tetsuya

doi:10.2331/suisan.16-00069

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Recently, basic reproductive information on A. schlegelii , such as spawning seasons, sexual patterns and length at maturity, was reported for wild samples from the Tokyo Bay of Japan and the northern South China Sea (Law & Sadovy de Mitcheson, 2017, 2018; Yamashita et al ., 2015). Hiroshima Bay in the Seto Inland Sea is an important fishery and spawning ground of A. schlegelii in Japan (Kawai et al ., 2017). Kawai et al .…”

Section: Introductionmentioning

confidence: 99%

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Spawning time of black sea bream Acanthopagrus schlegelii, related to underwater photoperiodism in oyster farms

Kawai

Fujita

Deville

et al. 2022

Journal of Fish Biology

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The embryonic development times, spawning timing and hatching rates of the black sea bream Acanthopagrus schlegelii were examined to investigate the potential effect of seawater temperature, tides and photoperiod on the reproductive rhythm of this species in Hiroshima Bay, Japan. Low temperatures decreased hatching rates and extended the hatching time, and the minimum temperature threshold for hatching was 15 C. Back-calculated spawning times indicated that the peak of spawning occurred just before sunset and the reduction in diurnal light intensity around the oyster rafts acted as a trigger for spawning. In contrast, no correlation was found between spawning rhythms and tidal cycle. The results highlight the important role of oyster farms in the reproductive cycle and population dynamics of A. schlegelii in Hiroshima Bay, the main spawning ground for this species in Japan. The study findings provide insights for the sustainable management of this important sparid species.

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Section: Introductionmentioning

confidence: 99%

“…. Hiroshima Bay in the Seto Inland Sea is an important fishery and spawning ground of A. schlegelii in Japan (Kawai et al, 2017). Kawai et al (2020) reported that since the 1980s, the spawning seasons have shifted and occurred earlier in the season.…”

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confidence: 99%

Spawning time of black sea bream Acanthopagrus schlegelii, related to underwater photoperiodism in oyster farms

Kawai

Fujita

Deville

et al. 2022

Journal of Fish Biology

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“…Based on genetic analyses, Yamashita et al (2021) suggested managing this species as a single stock across Japan. Black sea bream is particularly abundant at Hiroshima Bay (Jeong et al, 2007) which is used as a spawning ground, observed based on the higher relative abundances of black sea bream eggs than other fishes (Kawai et al, 2017). Black sea bream is a promiscuous spawner (Jeong et al, 2007) that laid spherical planktonic eggs with diameter ranges from 0.83-0.91 mm during the night-time (Mito, 1963;Koga, Tanaka & Nakazono, 1971).…”

Section: Introductionmentioning

confidence: 99%

Oyster farms are the main spawning grounds of the black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan

Kawai

Fujita

Sánchez

2021

PeerJ

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Understanding the anthropogenic impact of oyster farms is essential for the management and conservation of marine fishes. In Japan, Hiroshima Bay is the region with the most intense oyster farming and thus suitable to study the impact of these farms. Here, we surveyed spherical planktonic eggs of the black sea bream Acanthopagrus schlegelii, one of the most abundant fish in the Bay. Our survey was performed at fourteen stations which included places with oyster farms and historical spawning grounds. We found the highest egg densities in four stations, one with historical spawning aggregations and three with major oyster farms. Besides, surveys at the innermost part of Hiroshima Bay, where two major rivers discharge, showed a low density of eggs indicating that black sea bream avoids spawning in low salinity areas. Our study suggests that oyster farms benefit spawners of black sea bream by providing more food sources than historical spawning grounds for efficient spawning. Yet, whether oyster farms represent a full advantage for the species remains unclear, particularly because they are known to host jellyfishes that prey on eggs and limit water flow that can influence the survival of fish eggs.

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Estimating the spawning season of black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan, from temporal variation in egg density

et al. 2020

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DNA identification and seasonal changes of pelagic fish eggs in Hiroshima Bay

Cited by 6 publications

References 6 publications

Spawning time of black sea bream Acanthopagrus schlegelii, related to underwater photoperiodism in oyster farms

Spawning time of black sea bream Acanthopagrus schlegelii, related to underwater photoperiodism in oyster farms

Oyster farms are the main spawning grounds of the black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan

Estimating the spawning season of black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan, from temporal variation in egg density

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