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The problem of marine litters for cultured teleost
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Researchers investigated marine litter ingested by captive Pacific bluefin tuna juveniles and found that polystyrene microplastics were the dominant debris type, and that ingestion of polystyrene chips caused mortality and reduced swimming performance in multiple cultured teleost species.
Here, characteristics of marine litter ingested by Pacific bluefin tuna (PBF, Thunnus orientalis) juveniles under captive conditions were investigated. Swimming speeds of PBF juveniles with pseud-ingested polystyrene chips were compared, and mortality due to polystyrene chip ingestion in cultured teleosts (red sea bream, greater amberjack, and white trevally) was examined in the laboratory. Marine litter ingested by the PBF juveniles included mainly microplastics. The body size of dead specimens with ingested marine litter was significantly smaller than that of other dead fish. We suggest that when the PBF juveniles ingested the marine litter, they died due to energy exhaustion within a few days. All the examined species ingested polystyrene chips, but no related mortality was confirmed. These results suggest that only the PBF could not vomit or excrete the ingested marine litter. This study indicates that the marine litter problem significantly affects the aquaculture industry, especially tuna aquaculture.
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Polystyrene microplastics affect the early life stages of large yellow croaker Pseudosciaena crocea
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Researchers exposed early life stages of large yellow croaker fish to polystyrene microplastics and found that 1-micrometer particles increased larval mortality and decreased body length at high concentrations, while 5-micrometer particles disrupted phospholipid metabolism in cell membranes, indicating developmental risks to commercially important fish species.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.