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

Kawai, Kentaro; Fujita, Hiroki; Sánchez, Gustavo; Furusawa, Shuichi

doi:10.1007/s12562-020-01433-1

Cited by 11 publications

(16 citation statements)

References 13 publications

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“…At Hiroshima Bay, large-size adults of black sea bream are abundant aggregates beneath oyster rafts (Sakai, Shimizu & Umino, 2013) to feed on abundant sessile organisms (Saito et al, 2008). These aggregations peaked in May and coincided with the spawning season of this fish (Tsuyuki & Umino, 2018;Kawai et al, 2020). Across the fourteen stations, the relative abundance of black sea bream eggs, as well as the egg density, were higher in major oyster farming areas located at St. 4, 7, and in particular, at St. 14; the latter one of the largest oyster farming area in the Hiroshima Bay (Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Eggs were stained using monoclonal antibodies specific for black sea bream eggs developed in Kawai et al (2020). The ethanol was removed from eggs by washing them in phosphate-buffered saline (PBS).…”

Section: Identification Of Eggsmentioning

confidence: 99%

“…Historical spawning grounds of this species are located off western Noumishima Island in Hiroshima Bay (Umino, 2010), where it also faces fishing of bottom-trawling which targets spawning aggregations of this species (Blanco Gonzalez et al, 2009;Umino, 2010). Near the oyster rafts of Hiroshima Bay, the highest density of black sea bream has been reported in May (Tsuyuki & Umino, 2018), which coincides with the peak of its spawning season (Kawai et al, 2020). Here, black sea bream prey on sessile organisms such as mussels, barnacles, and oyster spats of the culturing oyster wires (Saito et al, 2008).…”

Section: Introductionmentioning

confidence: 98%

“…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). In Japan, the spawning season of black sea bream starts in spring until early summer (April to July) (Yamashita, Katayama & Komiya, 2015;Kawai et al, 2020). Historical spawning grounds of this species are located off western Noumishima Island in Hiroshima Bay (Umino, 2010), where it also faces fishing of bottom-trawling which targets spawning aggregations of this species (Blanco Gonzalez et al, 2009;Umino, 2010).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Identification Of Eggsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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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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“…In Japan, black sea bream was part of a stock enhancement program since the 1980s, principally in Hiroshima Bay ( Fushimi, 2001 ; Gonzalez, Umino & Nagasawa, 2008 ). The total landings per year of black sea bream reached 2,500 metric tons in 2004 but decreased in more recent years ( Gonzalez, Umino & Nagasawa, 2008 ) partially due to global warming, which has affected its spawning period and egg abundance ( Kawai et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

The role of the isolation of the marginal seas during the Pleistocene in the genetic structure of black sea bream Acanthopagrus schlegelii (Bleeker, 1854) in the coastal waters of Japan

Yamashita

Sánchez

Kawai

et al. 2021

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The black sea bream Acanthopagrus schlegelii (Bleeker, 1854) is a commercially important species in Japanese waters. Assessing its population structure is essential to ensure its sustainability. In the Northwestern Pacific, historical glacial and interglacial periods during the Pleistocene have shaped the population structure of many coastal marine fishes. However, whether these events affected the population of black sea bream remains unknown. To test this hypothesis and to assess the population structure of black sea bream, we used 1,046 sequences of the mitochondrial control region from individuals collected throughout almost the entire Japanese coastal waters and combined them with 118 sequences from populations distributed in other marginal seas of the Northwestern Pacific Ocean. As in other coastal marine fish with similar distribution, we also found evidence that the glacial refugia on the marginal seas prompted the formation of three lineages in black sea bream. These lineages present signatures of population growth that coincided with the interglacial periods of the Pleistocene. While the origin of Lineages B and C remains unclear, the higher relative frequency of Lineage A in the southernmost location suggests its origin in the South China Sea. The non-significant pairwise ΦST and AMOVA of Japanese populations and the presence of these three lineages mixed in Japanese waters; strongly suggest that these lineages are homogenized in both the Sea of Japan and the Pacific Ocean. Our results indicate that the black sea bream should be managed as a single stock in Japan until the strength of connectivity in contemporary populations is further addressed using non-coding nuclear markers.

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Seasonal changes in the distribution of black sea bream Acanthopagrus schlegelii estimated by environmental DNA

et al. 2022

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

Cited by 11 publications

References 13 publications

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

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

The role of the isolation of the marginal seas during the Pleistocene in the genetic structure of black sea bream Acanthopagrus schlegelii (Bleeker, 1854) in the coastal waters of Japan

Seasonal changes in the distribution of black sea bream Acanthopagrus schlegelii estimated by environmental DNA

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