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Recent field studies have pointed out that the vulnerability of juvenile fish to predation is higher than anticipated during night-time in vegetated habitats. Effects of abundance, body length, and growth rate on predation were examined in juvenile Japanese black rockfish in 2009–2011 in a macroalgal bed. Juvenile rockfish abundance ranged between 2.5 and 49.0 ind. 100 m–2 and the biomass of potential predators (piscivorous fish &gt;82.5 mm) between 140.0 and 601.3 g 100 m−2. Sebastes inermis was the most dominant predator, compromising more than 50% by wet weight on all sampling days. Comparison of the total length of juveniles surviving (as original population, OP) and that of juveniles ingested (IG) by predators provided the evidence of the size-selective predation on juvenile rockfish on three of seven sampling days. The juvenile predation rate estimated as abundance of IG (N 100 m−2)/(abundance of IG + OP (N 100 m−2)) × 100100 varied between 0.4 and 12.5%. Neither juvenile rockfish abundance nor predator biomass had a significant effect on the juvenile predation rate, whereas the juvenile body length had a significant effect, smaller individuals being more vulnerable to predation. The growth-selective predation was not detected. Macroalgal habitats, although functioning as nurseries during the day, may contribute as feeding grounds for piscivorous fish predators at night leading to enhanced nocturnal predation rates.

Night-time predation on post-settlement Japanese black rockfish Sebastes cheni in a macroalgal bed: effect of body length on the predation rate