Papers by atsushi hagiwara
Fisheries Science, Oct 16, 2023
Nippon Suisan Gakkaishi, 2005
Nippon Suisan Gakkaishi 71(6), 911 916 (2005) マハタ仔魚のワムシサイズに対する摂餌選択性 Food selectivity of seven-ba... more Nippon Suisan Gakkaishi 71(6), 911 916 (2005) マハタ仔魚のワムシサイズに対する摂餌選択性 Food selectivity of seven-band grouper Epinephelus septemfasciatus larvae fed diŠerent sizes of rotifers YUKARI TANAKA, 1a YOSHITAKA SAKAKURA, 2 HISASHI CHUDA, 3b ATSUSHI HAGIWARA 1 AND SUSUMU YASUMOTO 3
Nippon Suisan Gakkaishi, Nov 15, 2018
Aquaculture Science (Japan), Mar 20, 2008
The feed value of two cladocerans Moina macrocopa and Diaphanosoma celebensis for prawn, Penaeus ... more The feed value of two cladocerans Moina macrocopa and Diaphanosoma celebensis for prawn, Penaeus japonicus was compared with Artemia. Fatty acid profile revealed that the fortification with chlorella V12 greatly enhanced raised eicosapentaenoic and docosahexaenoic acid levels of both cladocerans. Prawn, Penaeus japonicus (postlarva-stage) was fed fortified M. macrocopa, D. celebensis and Artemia larvae as a control for 30 days. The body length of prawn fed cladocerans was significantly longer than that fed Artemia. Survival rate was higher in prawn fed D. celebensis than others. Fatty acid composition of the prawn larvae changed in response to the fatty acid profile of feeds. These results implied that cladoceran D. celebensis can be a suitable live feed other than Artemia for inducing mass seeding production of prawn.
Journal of Experimental Marine Biology and Ecology, Sep 1, 2019
Marine harpacticoid copepod Tigriopus japonicus is commonly distributed in the tide-pools and sho... more Marine harpacticoid copepod Tigriopus japonicus is commonly distributed in the tide-pools and shows benthic behavior. To determine its phototactic behavior, the movement pattern was investigated with different light wavelengths (white, peaks at 460 and 570nm; blue at 470 nm; green at 525 nm; and red at 660 nm) and intensities (0.5, 2.0, 3.5, 5.0, 15.0 W/m 2 ) related to developmental stages i.e., nauplius and adult. The eyespot of the two developmental groups efficiently absorbed the light wavelength from 400 to 550 nm, while the level of absorbance was different. For the horizontal phototactic behavior, nauplii showed negative phototaxis with the all tested light wavelengths and intensities ranging 0.5-5.0 W/m 2 , while they lost phototactic movement at 15 W/m 2 of all conducted light wavelengths except with the red light shown negative phototaxis. The adults showed negative phototaxis at 0.5 and 3.5 W/m 2 , while positive phototaxis at 2.0 W/m 2 regardless of light wavelengths. The vertical phototactic movement was only monitored with adults. At 2.0 and 3.0 W/m 2 , more than 40 % of adults showed planktonic behavior with the blue light. The results elucidate that T. japonicus has different patterns of phototaxis related to developmental stages which can be used to manipulate its distribution for dispersal.
Journal of Environmental Biology, Sep 30, 2020
This review focuses on the potential of Moina sp. as a promising live feed in aquaculture, as wel... more This review focuses on the potential of Moina sp. as a promising live feed in aquaculture, as well as on low-cost enrichment methods, which can improve nutrition levels available from this live feed species. Since formulated feed for this purpose has not yet been established effectively, the features of live feeds in the performance of marine and freshwater larval rearing is essential. Hence, to succor growth productivity and to introduce newly livestock species into aquaculture industry, support for the stage of larval rearing must be improved and, better nutritional options must be applied. Furthermore, the natural feeding habits of fish needs live food rich in protein for improved growth, enhanced reproduction as well as survival. Common enrichment protocols, such as oil emulsion, are relatively expensive and consequently, increase overall production cost in hatcheries. The above factors have moved scientists to focus more on development of low-cost, live feed substitutions to ensure success of larval feeding in aquaculture. Larval feed performance depends directly on improvements in finding a better low-cost live feed technology for a better zooplankton and phytoplankton production. Cladocerans like Moina sp. have recently been explored as a potential live feed alternative to boost fish and shrimp larval cultivation in hatcheries. The increase in demand for fish as a source of protein for human consumption requires advancement in the development of aquaculture technologies and, emphasis is well placed on improving supply of live food organisms to assist in the larval development process. The continuous production of live food organisms is prerequisite to fish and shrimp larval growth and survival in hatcheries.
Nippon Suisan Gakkaishi, 1992
Aquaculture Science, Dec 20, 2014
P-07 タナゴ， Acheilognathus melanogaster の産卵期の終了誘導要因 ○ 太田勇太(東海大院地球環境科学研究科) ・秋山信彦(東海大学海) P-08 mtDNA多型... more P-07 タナゴ， Acheilognathus melanogaster の産卵期の終了誘導要因 ○ 太田勇太(東海大院地球環境科学研究科) ・秋山信彦(東海大学海) P-08 mtDNA多型による養殖クルマエビの遺伝的多様性評価 ○ 後藤卓哉(愛媛大農) ・高木基裕(愛媛大南水研セ) ・菅谷琢磨・浜野かおる(瀬戸内水研セ) P-09 クルマエビの初期環境水温と性比 ○ 伏屋玲子(水研セ水工研) ・安井理奈(沖縄県漁港漁場課) ・坂本 崇(東京海洋大) P-10 マツカワ(Verasper moseri)から分離したスクーチカ繊毛虫の食酢・茶抽出物に対する感受性 ○ 伊藤慎悟(道総研中央水試) ・笠井久会(北大院水) P-11 海水飼育したサケ稚魚の絶食にともなう栄養状態の変化 ○ 伴 真俊 (水研セ北水研) P-12 カタクチイワシを用いた海産魚ゲノム編集のための実験系開発 ○ 中島奏子(九大院農) ・坂口圭史・北野 載・長野直樹(九大院農唐津水研セ) ・松山倫也(九大院農) P-13 マアジ受精卵の孵化時間および仔稚魚の成長に水温が及ぼす影響 ○ 魚住和弘(九大院農) ・酒井 猛・高橋素光・依田真里(水研セ西海水研) ・松山倫也(九大院農) P-14 クルマエビが捕食する二枚貝の殻長の成長に伴う変化 ○ 吉田 歩(長大院水環) ・井上 猛・岡野将大(長大水) ・ 山崎英樹・伊藤 篤・ 崎山一孝(水研セ瀬水研) ・阪倉良孝(長大院水環) P-15 甲殻類における血球種の変化 ○ 近藤昌和・安本信哉・高橋幸則(水大校)
Suisanzoshoku (Japan), Jun 20, 2010
We aimed at developing a technique for practical mass transportation of the rotifer Brachionus pl... more We aimed at developing a technique for practical mass transportation of the rotifer Brachionus plicatilis (S-type), based on the existing method used in transporting L-type rotifer. Among the two S-type strains used in Japanese public hatcheries, Yaeyama strain showed significantly higher tolerance to low temperature (5℃) than Okayama strain, thus, we used Yaeyama strain in this study. For high density transportation of rotifers cultured at 25℃, pretreatment cooling at 15℃, is effective. Rotifers were packaged at 30,000 ind./ml in 300-1,000 ml seawater. Thereafter, the rotifers were refrigerated at 5℃．The recovery rate of rotifers after these treatments was about 70% after 2 days of storage. Refrigerated rotifers were less viable, and at least one day recovery period at 25℃ is necessary before the rotifers can be used as starter of mass culture or food for fish larvae. Based on these results, we conducted a high-density rotifer transportation at 5℃, and 3×10 8 rotifers were transported to other hatcheries in 48 hours using a commercial delivery service. The recovery rates of rotifers at arrival were more than 70%. These results showed that high-density transportation of using Yaeyama S-type rotifer strain is possible by optimizing the processes we established.
Reviews in Fish Biology and Fisheries, Mar 4, 2023
A common goal among fisheries science professionals, stakeholders, and rights holders is to ensur... more A common goal among fisheries science professionals, stakeholders, and rights holders is to ensure the persistence and resilience of vibrant fish populations and sustainable, equitable fisheries in diverse aquatic ecosystems, from small headwater streams to offshore pelagic waters. Achieving this goal requires a complex intersection of science and management, and a recognition of the interconnections among people, place, and fish that govern these tightly coupled socioecological and sociotechnical systems. The World Fisheries Congress (WFC) convenes every four years and provides a unique global forum to debate and discuss threats, issues, and opportunities facing fish populations and
Aquaculture Science, Sep 20, 2005
The optimum rearing conditions of two species of amphidromous atyd shrimp Caridina typos and Cari... more The optimum rearing conditions of two species of amphidromous atyd shrimp Caridina typos and Caridina leucosticta collected from Koegawa River, Nagasaki, Japan, were examined
Aquaculture Science (Japan), Sep 20, 2007
Mitochondrial DNA Part B, Jul 3, 2019
The complete mitochondrial genome was sequenced from the marine mysid Neomysis awatschensis. The ... more The complete mitochondrial genome was sequenced from the marine mysid Neomysis awatschensis. The sequenced total genome size was 19,135 bp. The mitochondrial genome of N. awatschensis contained 13 protein-coding genes (PCGs), two rRNAs, and 22 tRNAs. Of 13 PCGs, all the genes had complete stop codons TAA and TAG, respectively, while the start codon of 13 PCGs was ATG (CO1, Cytb, ND4L, ATP8, ATP6, and ND4 genes), ATT (CO3, ND2, and ND5 genes), and ATA (CO2, ND3, ND6, and ND1 genes), respectively. The ratio of A þ T and G þ C nucleotides of 13 PCGs of N. awatschensis mitogenome showed 68.8% and 31.2%, respectively, while those ratio of all the sequences were 70.8% and 29.2%, respectively.
Fisheries Science, 2002
The effect of 12 known and suspected endocrine disrupting chemicals (EDCs) on the demographic par... more The effect of 12 known and suspected endocrine disrupting chemicals (EDCs) on the demographic parameters of Tigriopus japonicus was evaluated. Less than 24-h old nauplii were exposed to four concentrations of EDCs at 25•Ž.
Salinity gradient in a rearing tank was formed by pumping bracki Salinity gradient in a rearing t... more Salinity gradient in a rearing tank was formed by pumping bracki Salinity gradient in a rearing tank was formed by pumping brackish water sh water (22 ppt) from the surface and seawater (34 ppt) from the bottom (22 ppt) from the surface and seawater (34 ppt) from the bottom at the same at the same time (Fig. ). Control rearing tanks were aerated at 300 mL/min. time (Fig. ). Control rearing tanks were aerated at 300 mL/min. Fish were Fish were reared until day 23. reared until day 23. We hypothesized that this fluctuation is due to the differences We hypothesized that this fluctuation is due to the differences in the rearing environment, in the rearing environment, such as water flow and light intensity in the rearing tanks, and such as water flow and light intensity in the rearing tanks, and examined the different flow examined the different flow field and light intensities on the larval performance of this sp field and light intensities on the larval performance of this species. ecies. 3 different experiments were conducted from hatching to settleme 3 different experiments were conducted from hatching to settlement (juvenile), and growth nt (juvenile), and growth and survival of fish were compared. and survival of fish were compared. Newly hatched larvae were stocked into 1 kL cylindrical black ta Newly hatched larvae were stocked into 1 kL cylindrical black tank ( nk (Ø Ø130 cm, 70 cm depth) 130 cm, 70 cm depth) at a density of 12000 larvae/tank. Fish were reared at the same at a density of 12000 larvae/tank. Fish were reared at the same temperature (25 temperature (25 C), C), water exchange rate (100 %/day) and feeding regime (Olsen et al. water exchange rate (100 %/day) and feeding regime (Olsen et al. 2003(Olsen et al. ). 2003).
for High-density Water Flea Culture
Despite of the significance of three species of amphidromous atyd shrimp, Caridina typos, C. serr... more Despite of the significance of three species of amphidromous atyd shrimp, Caridina typos, C. serratirostris, and C. leucosticta in coastal ecosystem in southwest Japan, their morphological characteristics in early life history have not been clarified. It has been known that the distribution pattern of chromatophores differs in zoeal I and II stages of the above species. However, morphological features of later zoeal stages for species identification have not been unidentified. We compared the morphological features of the above species based on the larval specific under laboratory culture. Among the characters examined, only the shape of carapace is distinct and useful for species identification, and this can be used to identify larval insters after Zoea III. The zoeal instars were easily identified by the shape of pereopod, pleopod and tail. The larval developmental patterns of C. typos and C. serratirostris were almost the same. The number of zoeal instars and duration of C. leuco...
JOURNAL OF SUSTAINABILITY SCIENCE AND MANAGEMENT, 2021
TThere has been high demand in aquaculture for live feed as a starter feed for fish and crustacea... more TThere has been high demand in aquaculture for live feed as a starter feed for fish and crustacean larvae. The Moina sp is a potential live-feed species due to its availability in most of the natural water resource, high nutritional value and the potential to replace other types of zooplankton, which are commonly used in aquaculture, such as Artemia. This study aims to compare the survival, growth, and proximate analyses of Penaeus monodon larvae fed with different enriched Moina sp. The Penaeus monodon larvae, which are fed on Moina sp were enriched with different formulas, comprising yeast, canola oil, Nannochloropsis sp, and Chlorella sp. This study was conducted at the hatchery of Faculty of Fisheries and Food Sciences (FPSM) in Universiti Malaysia Terengganu. The Moina sp. was cultured for 6 generations before starting the experiment. Enriched Moina sp was placed in triplicates in an aquarium, reared for 30 days, and fed to 450 individuals. The highest specific growth rate of P. monodon was recorded when fed with Moina-enriched yeast (17.22 ± 0.10 %) with a survival rate of 91.78 ± 1.67 %. Overall, the Moina-enriched yeast displayed the best result compared to other enrichment methods, especially towards the biochemical compositions of the shrimp. The mean value of protein, lipid, moisture and ash amounted to 64.04 ± 0.40 %, 4.91 ± 2.43 %, 16.89 ± 2.75 %, and 10.38 ± 2.05 % respectively. It was found that the enrichment methods using yeast were effective on Moina sp, and improved the nutritional composition of shrimp larvae and the larval performance of P. monodon postlarvae production in hatcheries by utilising low-cost enriched Moina sp as live food..
Salinity is a known factor which shapes population dynamics and community structure through direc... more Salinity is a known factor which shapes population dynamics and community structure through direct and indirect effects towards aquatic ecosystems. The responses of Moina macrocopa (Cladocera) collected from Setiu Wetland lagoon (Terengganu) were evaluated through manipulative laboratory experiments to understand the ability of M. macrocopa to tolerate under high salinity stress. Specifically, the fatty acid composition, growth, survival and reproduction of this cladocerans species were examined. Sodium chloride (NaCl) were used in the treatments water with the concentration 0, 4, 6, 8, 12, and 15psu. Fatty acid levels were determined using Gas Chromatography and Mass Spectrophotometry (GC-MS). Results clearly indicate that normal conditions give the highest content of fatty acid, especially the polyunsaturated fatty acid content like EPA (eicosapentaenoic acid), ALA (alpha-linoleic acid), ARA (arachidonic acid) and DHA (docosahexaenoic acid). Furthermore, M. macrocopa survival also...
NIPPON SUISAN GAKKAISHI, 2015
Uploads
Papers by atsushi hagiwara