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131.
Effect of dietary taurine enhancement on growth and development in red sea bream Pagrus major larvae 下载免费PDF全文
Yang‐Su Kim Tsukasa Sasaki Masato Awa Maho Inomata Tomoki Honryo Yasuo Agawa Masashi Ando Yoshifumi Sawada 《Aquaculture Research》2016,47(4):1168-1179
This study investigated the effect of feedings taurine‐enriched rotifers on the growth and development of larval red sea bream (RSB). Rotifers incubated in taurine‐enriched water at a taurine concentration of 800 mg L?1 (T‐800) and 0 mg L?1 (T‐0) were fed to larvae from 3 to 20 days after hatching (DAH). Notochord length, body weight and specific growth rate of T‐800 group were significantly greater than those of T‐0 at 14, 17, 9–11 and 18–20 DAH. Taurine content of larvae in the T‐800 group increased rapidly from 11 DAH and thereafter remained significantly higher than T‐0. Flexion larvae firstly appeared in both groups at 8 DAH, however, at 20 DAH post‐flexion larvae were significantly more abundant in T‐800 than T‐0. While nucleic acid and protein contents (μg mg?1 wet fish) showed remarkable changes, ontogenetic growth in RSB larvae stage was observed to switch from hyperplastic growth to hypertrophic growth with the start of the flexion stage. Although a similar change in nucleic acid contents was observed between the two groups, the protein content (μg fish?1) and protein/DNA ratio of T‐800 remained higher than that of T‐0 during the hypertrophic growth period. These results suggest that dietary taurine accelerates the growth and development in RSB larvae especially during hypertrophic growth (flexion stage) after the early hyperplastic growth. 相似文献
132.
Promotion of initial swim bladder inflation and effect of initial inflation failure on skeletal malformation in cultured seven‐band grouper Hyporthodus septemfasciatus (Thunberg) 下载免费PDF全文
Masaharu Tsuji Susumu Uji Yasushi Tsuchihashi Kazuhiro Okada Takeshi Kawamura Takashi Katoh Tohru Kasuya Takuo Nigo Atsushi Hamabe Atsushi Miyamoto Sahoko Nakamura Akiko Nakano Yoshifumi Sawada 《Aquaculture Research》2016,47(6):1954-1971
The effects of the removal of the oily surface film on initial swim bladder inflation and survival in cultured seven‐band grouper Hyporthodus septemfasciatus were investigated during the larval stage. Additionally, the relationship between swim bladder inflation failure and malformations in later stages was examined. To explore promotion conditions for inflation, duplicate experiments were conducted under three different water surface conditions: removal of the oily surface film (ROF group), covering the water surface with an oil film (COF group), and sealing the water surface with liquid paraffin (SLP group). Larval swim bladder inflation was first observed 14 days after hatching (DAH) in the ROF group; thereafter, swim bladder inflation rates increased to 11.1% and 38.7% until the end of the experiments. This indicates that initial swim bladder inflation occurs at the pre‐flexion stage in larval development. Conversely, bladder inflation was rarely observed in the COF or SLP groups, indicating the promotional effect of surface film removal on larval swim bladder inflation and suggesting that gulping atmospheric air is necessary for initial inflation. Although larval water surface death occurred frequently in the ROF group, no significant difference existed in any group between the survival rates at 10 DAH and at the end of the experiment. The incidence rate of spinal curvature and deformation of the centra was significantly higher in individuals without initial swim bladder inflation, and these malformations mainly occurred in the caudal vertebra. Therefore, the removal of the oily surface film promotes initial swim bladder inflation and reduces larval malformations. 相似文献
133.
Teruyoshi Tanaka Kenji Takahashi Kohsuke Adachi Haruki Ohta Yukihiro Yoshimura Yasuo Agawa Yoshifumi Sawada Osamu Takaoka Amal Kumar Biswas Kenji Takii Nobuhiro Zaima Tatsuya Moriyama Yukio Kawamura 《Fisheries Science》2014,80(3):603-612
Type I collagen is widely distributed in most organs in teleosts. It plays a role not only in intercellular adhesion, but also in molecular signaling. In this study, Pacific bluefin tuna (PBT) procollagen α1 (I) cDNA was cloned and characterized. The nine fragments of a procollagen α1 (I) chain cDNA clone were prepared and spliced together to create the complete coding region. The resulting amino acid sequence was homologous with that of other teleosts. The mRNA expression profile of PBT procollagen α1 (I) in various tissues and the phylogenetic analysis with other vertebrate procollagen α1 (I) chains suggest that PBT procollagen α1 (I) could be a precursor form of the PBT type I collagen α1 chain. In addition, its level of expression in PBT larvae and early juveniles gradually increased with somatic growth. This increase was related to the standard length, wet body weight, and protein content of each individual fish. Therefore, the expression profile of procollagen α1 (I) may be a useful indicator for somatic growth in fish larvae and juveniles. 相似文献
134.
Roy Bimol Chandra Ando Masashi Nakatani Masahiro Okada Tokihiko Sawada Yoshifumi Itoh Tomohiro Tsukamasa Yasuyuki 《Fisheries Science》2012,78(2):471-483
Following the successful development of Pacific bluefin tuna (PBT) aquaculture, it is of considerable importance to determine
the muscle fiber types and their growth patterns for future development. Muscle fiber profiles of dorsal ordinary, lateral
ordinary (LO) and dark muscles and their growth patterns in PBT from 3.0 to 54.3 kg body weight were studied. Muscle fibers
were histochemically stained for NADH-diaphorase and myosin adenosine triphosphatase activity (mATPase), and immunohistochemically
stained with S-58 slow-muscle myosin antibody. All muscle fibers in dorsal and LO muscles showed low NADH-diaphorase activity,
and acid-labile (pH 4.0 or 4.3) and alkali-stable mATPase activity. In LO muscle adjacent to dark muscle, three intensities
of mATPase activity were observed after acid pre-incubation at pH 4.5 or 5.0, and the activity was related to the muscle fiber
diameter. In dark muscle, all small and some large fibers stained intensely for NADH-diaphorase activity, related to their
high aerobic metabolism. The high-active fibers with NADH-diaphorase in dark muscle were positive for S-58 antibody. Some
large fibers in dark muscle showed intermediate NADH-diaphorase activity and high mATPase activity after alkali pre-incubations.
These are fast-twitch oxido-glycolytic fibers in dark muscle and transformed to red muscle fibers with increasing body weight. 相似文献
135.
Teruyoshi Tanaka Kenji Takahashi Naoki Iwamoto Yasuo Agawa Yoshifumi Sawada Yukihiro Yoshimura Nobuhiro Zaima Tatsuya Moriyama Yukio Kawamura 《Fisheries Science》2012,78(4):911-921
We have shown that dietary bluefin tuna skin (TUS) protects against carbon tetrachloride (CCl4)-induced hepatic damage in mice. The CCl4-induced necrotic area was decreased in mice fed a TUS-containing diet. Consistent with the decreased necrotic area, dietary TUS markedly lowered the elevated serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities and the thiobarbituric acid-reactive substance (TBARS) formation induced by CCl4 injection. TUS diets also decreased phosphorylation of inhibitory kappa B-?? and blocked the translocation of nuclear factor-kappa B to the nucleus. TUS is composed mainly (80.7?%) of type I collagen, and our results revealed that dietary tuna collagen peptides (TUCP) attenuated the increased hepatic necrotic area, serum AST and ALT activities, and liver TBARS levels induced by CCl4, similar to TUS, thus enabling us to attribute the hepatoprotective action of TUS in CCl4-intoxicated mice to tuna collagen. Therefore, TUS and TUCP may be potential food resources that are capable of alleviating hepatitis symptoms. 相似文献