Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Obata, Yasuhiro; Yamazaki, Hideki; Iwamoto, Akio; Hamasaki, Katsuyuki; Kitada, Shuichi

doi:10.1080/10641260701697041

Cited by 21 publications

(17 citation statements)

References 19 publications

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“…The full reproductive biology of these species is unknown or very poorly known. This is particularly relevant for Chinese seerfish ( Scomberomorus sinensis ) and Japanese Spanish mackerel ( S. niphonius ), two important commercial species off the coast of Japan, Korea and China [35]–[38]. While for Japanese Spanish mackerel we lack any length or age at maturity and fecundity estimates, for Chinese seerfish there is no data on maturity, fecundity or growth.…”

Section: Resultsmentioning

confidence: 99%

The Conservation and Management of Tunas and Their Relatives: Setting Life History Research Priorities

Juan‐Jordá

Mosqueira²,

Freire³

et al. 2013

PLoS ONE

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Scombrids (tunas, bonitos, Spanish mackerels and mackerels) support important fisheries in tropical, subtropical and temperate waters around the world, being one of the most economically- and socially-important marine species globally. Their sustainable exploitation, management and conservation depend on accurate life history information for the development of quantitative fisheries stock assessments, and in the fishery data-poor situations for the identification of vulnerable species. Here, we assemble life history traits (maximum size, growth, longevity, maturity, fecundity, spawning duration and spawning interval) for the 51 species of scombrids globally. We identify major biological gaps in knowledge and prioritize life history research needs in scombrids based on their biological gaps in knowledge, the importance of their fisheries and their current conservation status according to the International Union for Conservation of Nature Red List. We find that the growth and reproductive biology of tunas and mackerel species have been more extensively studied than for Spanish mackerels and bonitos, although there are notable exceptions in all groups. We also reveal that reproductive biology of species, particular fecundity, is the least studied biological aspect in scombrids. We identify two priority groups, including 32 species of scombrids, and several populations of principal market tunas, for which life history research should be prioritized following the species-specific life history gaps identified in this study in the coming decades. By highlighting the important gaps in biological knowledge and providing a priority setting for life history research in scombrid species this study provides guidance for management and conservation and serves as a guide for biologists and resource managers interested in the biology, ecology, and management of scombrid species.

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Section: Resultsmentioning

confidence: 99%

The Conservation and Management of Tunas and Their Relatives: Setting Life History Research Priorities

Juan‐Jordá

Mosqueira²,

Freire³

et al. 2013

PLoS ONE

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“…We generated p h i by a multinomial random variable as rmultinom͑1, 2n, p iϪ1 ͒/2n using R, and the allele frequency in generation i was calculated as ([1, 2, 12, 86, 18, 10, 6, 3, 3, 9, 1, 1]) (Table S2 1 ). The mixing proportion of hatchery fish was 0.1379 ( = 0.1379), which was the empirical contribution rate of age-0 hatchery fish released in 2001 and 2002 in the landings in the ESIS (Obata et al 2008). The age at 100% maturity was 2 years in surveys conducted from 2000 to 2005 (Takemori 2006).…”

Section: Genetic Diversity and Population Structurementioning

confidence: 99%

“…Releases began in 1998 when 14 000 unmarked hatchery fish (40 mm total length (TL)) were released into the ESIS. Beginning in 1999, the otoliths of all JSM juveniles were marked using alizarin complexone (Tsukamoto et al 1989;Blom et al 1994) between hatch and 10 mm (TL) (for details see Obata et al 2008), after which they were released into the waters of eastern Bisanseto and northeastern Harimanada in the ESIS. In 1999, 8376 marked fish were released (TL 25-150 mm), but only 10 age-0 fish were recaptured, and no age-1 or -2 fish were recaptured in 2000 and 2001, respectively.…”

Section: Collecting Samplesmentioning

confidence: 99%

Genetic effects of marine stock enhancement: a case study based on the highly piscivorous Japanese Spanish mackerel

NakajimaKaori

KitadaShuichi

HabaraYoko

et al. 2014

Can. J. Fish. Aquat. Sci.

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Abstract:We used a before-after control-impact design to quantify the genetic effects of the large piscivorous Japanese Spanish mackerel (Scomberomorus niphonius) stock enhancement program on wild populations in the Seto Inland Sea. Samples of 1424 wild and 230 hatchery fish collected from 13 sites around Japan were genotyped using five microsatellite markers. A total of 758 wild and 103 hatchery fish were sequenced for the mitochondrial DNA D-loop region. The population structure of Japanese Spanish mackerel was panmictic around Japan. Hatchery fish had significantly lower genetic diversity indices than did wild fish. However, there was no significant change in any of the diversity indices in the Seto Inland Sea, despite the substantial genetic mixing proportion of hatchery-origin genes (7.8%-14.5% from releases in 2001 and 2002), a conclusion supported by simulations. The estimated effective population size was surprisingly small (ϳ430-970) but stable in the Seto Inland Sea compared with the large census size. A Ryman-Laikre effect was not likely in the Japanese Spanish mackerel.Résumé : Nous avons utilisé un schéma contrôle-incidence avant-après pour quantifier les effets génétiques du programme d'amélioration des stocks de thazard oriental (Scomberomorus niphonius), un grand poisson piscivore, sur les populations sauvages dans la mer intérieure de Seto. Des échantillons de 1424 poissons sauvages et 230 poissons d'élevage prélevés en 13 endroits différents au Japon ont été génotypés à l'aide de cinq marqueurs microsatellites. Un total de 758 poissons sauvages et 103 poissons d'élevage ont fait l'objet d'un séquençage de la région de la boucle D de l'ADN mitochondrial. La structure de la population de thazard oriental était panmictique dans la région du Japon. Les poissons d'élevage présentaient des indices de diversité génétique significativement plus faibles que les poissons sauvages. Cela dit, aucun indice de diversité ne présentait de variation significative dans la mer intérieure de Seto, malgré l'importante proportion de mélange génétique de gènes issus d'écloserie (7,8-14,5 % dans les lâchés en 2001 et 2002), une conclusion appuyée par les simulations. La taille effective estimée de la population était étonnamment faible (ϳ430-970), bien que stable, dans la mer intérieure de Seto comparativement à la grande taille recensée. La présence d'un effet Ryman-Laikre chez les thazards orientals était peu probable. [Traduit par la Rédaction]

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“…A total of 1 527 000 juvenile JSM were released in the ESIS between 1998 and 2010; the 100 mm release group accounted for 78.4% of the total released. The 40 mm release group has not been stocked since 2004 (Obata et al 2007, 2008, Yamazaki et al 2007; Fisheries Agency of Japan and Fisheries Research Agency [http:// abchan.job.affrc.go.jp/index1.html]). In total, 608 000 JSM juveniles have been released in the western SIS (WSIS) since 2002, with 40 mm TL juveniles comprising 40.7% of the released fish.…”

Section: Jsm Fishery and Stock Enhancementmentioning

confidence: 99%

“…The otoliths of all JSM juveniles were marked using alizarin complexone (ALC; Dojindo Laboratories) (Kuwada & Tsukamoto 1987, Tsukamoto 1988, Tsuka moto et al 1989) after they hatched and reached 10 mm TL (see Obata et al 2008 for details), before they were released into the waters of eastern Bi sanseto and north-eastern Harimanada in the ESIS. The JSM juveniles in the 40 mm groups were released in early June, while the 100 mm groups were released from late June to early July.…”

Section: Population Dynamics Of Jsm and Food Supplymentioning

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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Evaluation of Stocking Effectiveness of the Japanese Spanish Mackerel in the Eastern Seto Inland Sea, Japan

Cited by 21 publications

References 19 publications

The Conservation and Management of Tunas and Their Relatives: Setting Life History Research Priorities

The Conservation and Management of Tunas and Their Relatives: Setting Life History Research Priorities

Genetic effects of marine stock enhancement: a case study based on the highly piscivorous Japanese Spanish mackerel

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

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