Short-term Occurrence and Rapid Growth of Spanish mackerel Larvae in the Central Waters of the Seto Inland Sea, Japan

Shoji, Jun; Maehara, Tsutomu; Tanaka, Masaru

doi:10.2331/fishsci.65.68

Cited by 24 publications

(34 citation statements)

References 12 publications

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“…Data indicated by hollow circles were not included in regression analyses. (Peters and Schmidt, 1997) and Scomberomorus niphonius (Shoji et al, 1999) are known to form on a daily basis. Daily periodicity of S. commerson micro-increments is supported by the fact that juveniles appear to have hatched during the spawning period, as estimated by back calculations of birth dates from the date of capture.…”

Section: Validation and Formation Of Annulimentioning

confidence: 98%

“…This temporal periodicity was not determined, but a daily formation was assumed based on studies of other Scomberomorus species (e.g. Shoji et al, 1999;Peters and Schmidt, 1997). Validation of the annual nature of growth increments was based on the annual pattern evident in the margin type categories from the Pilbara region where it was possible to obtain samples throughout the year.…”

Section: Validation Of Otolith Increment Periodicitymentioning

confidence: 99%

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Age-based demography and relative fisheries productivity of Spanish mackerel, Scomberomorus commerson (Lacepede) in Western Australia

2012

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Section: Validation and Formation Of Annulimentioning

confidence: 98%

Section: Validation Of Otolith Increment Periodicitymentioning

confidence: 99%

Age-based demography and relative fisheries productivity of Spanish mackerel, Scomberomorus commerson (Lacepede) in Western Australia

2012

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“…The released juveniles were reared from eggs that were artificially inseminated in early and late May, which was before the main JSM spawning season in the SIS (Sugino et al 2005). According to Shoji & Tanaka (2006) and Shoji et al (1999bShoji et al ( , 2002 Table 3. Scomberomorus niphonius.…”

Section: Discussionmentioning

confidence: 99%

Ecological interactions between hatchery and wild fish: a case study based on the highly piscivorous Japanese Spanish mackerel

Nakajima¹,

Kitada²,

Yamazaki³

et al. 2013

Aquacult. Environ. Interact.

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If the release of hatchery-reared juveniles exceeds the carrying capacity of the environment, the growth rate of wild fish may decrease or hatchery fish might displace wild fish because of competition for prey and space, or cannibalism. However, limited evidence is available to confirm these ecological effects. Therefore, we used census-marking experiments to investigate the ecological interactions between hatchery and wild fish in the large piscivorous species Japanese Spanish mackerel (JSM) Scomberomorus niphonius in the Seto Inland Sea. We analysed the relationship between the mean body weight and population size of Age 0 JSM, and the relationship between the biomass of juvenile Japanese anchovy Engraulis japonicus, which is the principal prey fish of JSM, and that of Age 0 JSM. We also estimated the spawner−recruit relationship. We measured the body sizes of 5008 JSM juveniles during July and December between 1999 and 2005 in the eastern Seto Inland Sea, and 551 hatchery fish were identified in the sample based on examinations of marked otoliths. There was a negative correlation between the mean body weight and population size of Age 0 fish, which clearly demonstrated the density-dependent growth of Age 0 JSM. The ~35% variation in the biomass of Age 0 JSM was explained by the biomass of prey fish. Hatchery fish tended to be larger than wild fish, and they had better growth performance. Our analysis showed that hatchery fish reduced the growth rate of wild fish and displaced the wild fish in terms of biomass when hatchery fish stocking exceeded the carrying capacity of the environment.KEY WORDS: Displacement of wild fish · Carrying capacity · Density-dependent growth · Prey fish dynamics · Otolith marking · Scomberomorus niphonius · Marine stock enhancement

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“…Age in days of a total of 420 mackerel larvae 3.8-9.8 mm in body lengths was determined by examining otolith microstructures. 4) Vertical hauls of a conical plankton net (mouth diameter 0.6 m, mesh aperture 0.315 mm) were also made at each station. The abundance of clupeiform larvae, which are main prey of the Japanese Spanish mackerel larvae, 2 was considered as an index of prey abundance for the mackerel larvae.…”

Section: Methodsmentioning

confidence: 99%

Recruitment of an inherent piscivore, Japanese Spanish mackerel <i>Scomberomorus niphonius</i> (Scombridae)

2002

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SUMMARY. The hypothesis that prey abundance and larval growth rate are related to recruitment was tested in Japanese Spanish mackerel in the central Seto Inland Sea, Japan. The relationships among larval abundance, growth rate, prey fish (clupeiform larvae) abundance, and the catch per unit fishing effort (CPUE) of the subsequent 1-year-old fish were examined from 1995 to 1999. A significant, positive correlation was found between the larval growth rate and the CPUE, but not between the larval abundance and the CPUE. There also existed a significant positive correlation between the abundance of clupeiform larvae and the larval growth rate, which varied from 0.4 to 1.0 mm/day. Both the larval growth rate and the CPUE were higher in 1995 and 1999, when the period of peak occurrence of clupeiform larvae timed well with that of the mackerel larvae. It has been concluded that the prey abundance during the early larval period is one of the most important determinants of the growth and recruitment of Japanese Spanish mackerel.

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Short-term Occurrence and Rapid Growth of Spanish mackerel Larvae in the Central Waters of the Seto Inland Sea, Japan

Cited by 24 publications

References 12 publications

Age-based demography and relative fisheries productivity of Spanish mackerel, Scomberomorus commerson (Lacepede) in Western Australia

Age-based demography and relative fisheries productivity of Spanish mackerel, Scomberomorus commerson (Lacepede) in Western Australia

Ecological interactions between hatchery and wild fish: a case study based on the highly piscivorous Japanese Spanish mackerel

Recruitment of an inherent piscivore, Japanese Spanish mackerel <i>Scomberomorus niphonius</i> (Scombridae)

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