Katsuyuki Hamasaki

Tokyo University of Marine Science and Technology

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Shigeki Dan

Tokyo University of Marine Science and Technology

Shuichi Kitada

Ijinkai Takeda General Hospital

Kazuhisa Teruya

Japan Fisheries Research and Education Agency

Tetsuya Sanda

Japan Fisheries Research and Education Agency

Takeo Yamamoto

Japan Fisheries Research and Education Agency

Shigeki Dan

Japan Fisheries Research and Education Agency

Tadao Jinbo

Japan Fisheries Research and Education Agency

Toshio Takeuchi

Tokyo University of Marine Science and Technology

Takashi Iwasaki

Japan Fisheries Research and Education Agency

Keiichi Mushiake

Japan Fisheries Research and Education Agency

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Tokyo University of Marine Science and Technology

116

Japan Fisheries Research and Education Agency

The University of Tokyo

Universiti of Malaysia Sabah

Kyushu University

Kyoto University

Tohoku University

Hokkaido University

Nippon Suisan Kaisha (Japan)

Osaka University

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Bias and significance of relative reproductive success estimates based on steelhead trout (Oncorhynchus mykiss) data: a Bayesian meta-analysis

Canadian Journal of Fisheries and Aquatic Sciences (2011)

Shuichi Kitada Hirohisa Kishino Katsuyuki Hamasaki

The evaluation of the reproductive success (RS) of hatchery fish in the wild is one of the most important issues in hatchery supplementation, aquaculture, and conservation. Estimates of the relative reproductive success (RRS) have been used to evaluate RS. Because RRS may vary greatly depending on cross, years of release, and environmental conditions, we introduced a log-normal distribution to quantify the variation. The classical estimator of RRS based on multiple measurements is contrasted with the mean of this distribution. We derived the mean, variance, and relative bias and applied our Bayesian hierarchical model to 42 empirical RRS estimates of steelhead trout ( Oncorhynchus mykiss ) in the Hood River, Oregon, USA. The RRS estimate generally had an upward bias. Although the average level of RRS implied the reproductive decline of hatchery fish and wild-born hatchery descendants, we could not reject the null hypothesis that hatchery fish and their descendants have the same chance of having smaller RS than wild fish as they do of having larger RS than wild fish.

Hatchery

10.1139/f2011-087

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Citations (15)

Young individuals of the land hermit crab Coenobita spinosus (Decapoda: Anomura: Coenobitidae)

Cancer (2019)

Makoto Sasazuka Katsuyuki Hamasaki Dan Shigeki

Anomura

Hermit crab

Source

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Relative growth of pereiopods of the megalopa and early juveniles of <i>Portunus trituberculatus</i> (Miers, 1876) (Brachyura: Portunidae)

Crustacean Research (2018)

Satoshi Takeshima Shigeki Dan Yuming Sui Masaki Oshiro Katsuyuki Hamasaki

We examined relative growth of the pereiopods in megalopae and first to fifth crab stages of Portunus trituberculatus (Miers, 1876) reared in the laboratory. Relative growth of the body parts in relation to a reference dimension (carapace length) was analyzed by the log-transformed allometric growth equation lny=lna+blnx. Body proportions differed between the megalopae and juvenile crabs. In juveniles, the chela size showed isometric growth (b=1); the second to fourth pereiopods (walking legs) showed mainly negative growth (b<1) in length, and isometric growth (b=1) in width; and the width and length of the fifth pereiopod showed positive allometric growth (b>1). Portunus trituberculatus cling to drifting seaweeds using their chelae and pereiopods before undertaking a benthic life after the fourth or fifth crab stages; the chelipeds and fifth pereiopods are utilized mainly in the burying behavior of juveniles after settlement. Accordingly, the negative allometric growth in length of the walking legs likely represents an adaptation for a lifestyle shift from drifting seaweeds to benthos, whereas the isometric or positive allometric growth of the chelae and fifth pereiopods would be advantageous for the burying behavior of the crabs post-settlement.

Portunus trituberculatus

Portunidae

Allometry

Chela

10.18353/crustacea.47.0_125

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Citations (2)

Larval performance of three amphidromous shrimp species in the genus <i>Caridina</i> (Decapoda: Caridea: Atyidae) under different temperature and salinity conditions

Crustacean Research (2021)

Shuji Kondo Katsuyuki Hamasaki Shigeki Dan

We examined the effects of temperature and salinity on larval survival, duration, and growth of three amphidromous atyid shrimps, Caridina leucosticta, C. multidentata, and C. typus to infer larval dispersal strategy in the sea. Larvae were reared under 25 combinations of five different temperature (20, 23, 26, 29, and 32°C) and salinity (4.25, 8.5, 17, 25.5, and 34 ppt) levels. Interspecific variability was detected in larval performance: C. leucosticta larvae were able to survive to moult into the juvenile stage at the lower salinity condition (8.5 ppt), C. multidentata larvae exhibited an ability to adapt to the wide range of salinity condition (17–34 ppt), and C. typus larvae adapted to the higher salinity condition (34 ppt) better than C. leucosticta larvae. Larval duration was less variable between species. Thus, salinity adaptation of larvae may play an important role in mediating the larval dispersal of the three Caridina species in the sea. Larval dispersal range may be most limited near the river mouth for C. leucosticta, and be moderate for C. typus, and C. multidentata larvae may be able to disperse broadly under the high salinity condition of the open sea.

Caridea

10.18353/crustacea.50.0_41

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Citations (5)

Flocculation of Artemia induced by East Asian common Octopus octopus sinensis paralarvae under culture conditions

Aquaculture Reports (2020)

Shigeki Dan Arata Takasugi Hiraku Iwasaki Shodai Shibasaki Kazuhiro Yamashita

Artemia are potential food organisms for the mass culture of common octopus paralarvae but cause poor paralarval growth and mortality. To understand problems arising from Artemia use, we focused on Artemia flocculation in paralarval culture tanks; Artemia get caught up with each other, exhibit disrupted swimming, are deposited on the tank bottom and eventually die. To clarify whether paralarvae induce the flocculation of food organisms or not, we cultured newly hatched Artemia nauplii, 3-day-old metanauplii and decapod crustacean zoeae with or without paralarvae at different growth stages (weight). Flocculation occurred only when Artemia were cultured with paralarvae; metanauplii had a higher susceptibility for flocculation than nauplii. Flocculated Artemia proportion increased with increasing paralarval weight. Scanning electron microscopy revealed that flocculated metanauplii had deformed setules on their setae, with hook-shaped tips and adhesion of neighbouring tips, suggesting that flocculation may occur via a mechanism similar to the 'hook-and-loop fastener'. As octopus paralarvae exhibit external digestion, digestive enzymes secreted by paralarvae may deform Artemia setules and result in flocculation. As flocculation did not occur when metanauplii were cultured in water in which paralarvae were cultured and then removed, causative enzymes were probably rapidly inactivated after secretion.

octopus (software)

10.1016/j.aqrep.2020.100330

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Citations (3)

Relationship between mass mortality of megalops and morphogenesis of zoeas in the seed production of swimming crab Portunus trituberculatus (Brachyura: Portunidae)

NIPPON SUISAN GAKKAISHI (2004)

Daisuke Arai Katsuyuki Hamasaki Keigo Maruyama Yasuhiro Obata Seiichi Tsumura

Portunus trituberculatus

Portunidae

10.2331/suisan.70.567

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Citations (16)

Antipredator strategy of paralarvae of East Asian common octopus Octopus sinensis d’Orbigny, 1841: causing rejection after engulfing by a fish, and subsequent ink release for distraction during escape

Marine Biology (2023)

Shigeki Dan Miona Yamaji Yoshinori Kamei Kazuaki Sakiyama Katsuyuki Hamasaki

octopus (software)

Escape response

10.1007/s00227-023-04250-z

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Upper thermal tolerance of early juveniles of six terrestrial hermit crab species:supplementary material

Nao Kasuya Tetsuya Sanda Katsuyuki Hamasaki Shigeki Dan Shuichi Kitada

Because temperature strongly influences biological processes of ectotherms, they must adapt to the thermal conditions of their habitats. We evaluated the upper thermal tolerance of early juveniles of six terrestrial hermit crab species in the family Coenobitidae (genera Birgus and Coenobita), B. latro, C. brevimanus, C. cavipes, C. purpureus, C. rugosus, and C. violascens, that occur in the northwestern Pacific region of Japan. A total of 30 laboratory-raised juveniles (approximately 1 mm in shield length) carrying gastropod shells were individually stocked in small plastic cups with sandy bottoms in temperature-controlled incubation chambers at ~27°C. The temperature was increased by 1°C every 48 h, and the juveniles were observed until all the crabs had died. The median upper lethal temperature was estimated as the temperature at which 50% of the test juveniles had died. The median upper lethal temperature estimates significantly varied among the species. Coenobita violascens, which mainly occurs in mangrove estuaries with lower thermal conditions, had the lowest median upper lethal temperature values. The median upper lethal temperature values estimated for B. latro were slightly lower than those for the other Coenobita species, probably reflecting its cryptic nature in natural habitats during the juvenile stage. The most northerly distributed species, C. purpureus, had the highest median upper lethal temperature values, suggesting the existence of common physiological mechanisms that regulate both upper and lower thermal tolerance abilities.

Ectotherm

Hermit crab

Critical thermal maximum

10.6084/m9.figshare.8143163.v1

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Improved method for culturing the swimming crab Portunus trituberculatus larvae to prevent mass mortality during seed production

Fisheries Science (2015)

Shigeki Dan Masakazu Ashidate Katsuyuki Hamasaki

Portunus trituberculatus

Brine shrimp

10.1007/s12562-015-0935-y