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Volume 62 (1996)
- Issue 6 Pages 857-
- Issue 5 Pages 723-
- Issue 4 Pages 547-
- Issue 3 Pages 347-
- Issue 2 Pages 189-
- Issue 1 Pages 3-
Volume 62, Issue 5
Displaying 1-22 of 22 articles from this issue
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Hajime Kimura, Masahiro Notoya1996 Volume 62 Issue 5 Pages 723-726
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSFor the early harvest of Undaria undarioides (Yendo) Okamura, research was carried out to know the most suitable time and suspending depth in outplanting of seedlings, at Tanabe Bay in Wakayama Prefecture, Japan. The seedlings were outplanted in the sea on November 15 and December 5 and 15 1991, and in suspending depth of 0.5m, 1.5m and 2.5m. The blade size (blade length and width) and maturation by formation of zoosporangial sori were observed every 10 days. The seedlings which were outplanted at a depth of 0.5m on November 15 grew to the minimum commercial size (above the average blade length of more than 35cm) by the middle of January. U. undarioides could be harvested one month earlier than the usual outplant seedlings, due to early outplanting in the sea water temperature of less than 20°C. In the early outplanted seedlings, the blade grew wider and maturation was earlier than the usual outplanted seedlings.View full abstractDownload PDF (301K) -
Shigeru Fuwa, Munechika Ishizaki, Kensuke Yamaguchi, Takehiko Imai1996 Volume 62 Issue 5 Pages 727-732
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe relation between the construction of the trap for the Puffer fish and the fishing mechanism that it has was investigated. The relative efficiency of the trap was calculated with both the data of the trap width and the catch of fish. The calculated selectivity of the trap was compared with that estimated by the probability model for the Puffer trap fishery, taking into account the fish turning motion in a trap entrance. The obtained length selectivity for the puffer Lagocephalus wheeleri approximately agreed with the theoretical values. The length selectivity of the trap of the puffer Lagocephalus gloveri showed higher values than the theoretical values. The selectivity of the trap calculated on the probability model seemed to be influenced by the length of the Puffer fish.
We confirmed that the fishing mechanism of the trap for the Puffer fish depends on the behaviour of the fish inside of the trap entrance, but the behaviour of the fish seem not to be necessary uniform.View full abstractDownload PDF (401K) -
Takakazu Ozawa, Hirofumi Kuroiwa, Kazuhiro Tsuruta1996 Volume 62 Issue 5 Pages 733-739
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSAge at maturity and annual fecundity of Japanese flounder were studied with ovaries of 126 females (290-852mm TL) collected in the sea of south-west Kyushu from November to June. Most of the ovaries of females aged 1+ were younger than the yolk vesicle stage. Ovaries of the mature stage were obtained from December to April on females aged 2+, and Janualy to April on those aged 3+ and more, and most of the other ovaries were developed beyond the second yolk stage. The high rate of females with hydrated eggs was obtained in January and February (more than 50%) for females aged 2+ and in February (42%) for those aged 3+ and more, the total frequency of spawning being 4.7 for females aged 1+, 47 for aged 2+, and 23.7 for aged 3+ and more. The relationship between the batch fecundity, N and total length, TL was expressed by N=1.13×103×e(7.24TL×10-3). The annual fecundity in million was estimated to be about 0.1 for a 1+ age female 3.4, for 2+, and 6.87 for a female older than 3+.View full abstractDownload PDF (590K) -
Hiroaki Satou, Nobuo Sannomiya, Hiroshi Nakamine, Ko Matuda1996 Volume 62 Issue 5 Pages 740-746
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSA mathematical model of fish behavior is constructed in relation to a moving gear. The model presented in our earlier papers described the behavior of fish schools in relation to such a fixed gear as a fish trap. In this paper, a new model is proposed by introducing the mechanism of following a moving object into the main causes for the motion of fish. The parameters included in the model are estimated using the observed data for the swimming trajectories of rainbow trout Oncorhynchus mykiss in a water tank. The validity of the model is investigated by comparing the simulation result with the experimental result which was obtained by Matuda et al. for the case of a model net of trawl gear. It is observed from the simulation result that the individuals in a school change the swimming direction and speed to agree with the speed of the model net.View full abstractDownload PDF (433K) -
Shi Dong, Nobuhiko Taniguchi, Soichi Tsuji1996 Volume 62 Issue 5 Pages 747-753
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDNA fingerprinting and isozyme analyses of 32 Ginbuna (all female triploids) collected from the Monobe River, Kochi prefecture were carried out for identification of clones.
Genomic DNA extracted from blood were digested with Hae III restriction endonuclease, and were hybridized with 32P-labeled YNZ 22 probe for DNA fingerprinting. Isozymes of muscle and liver frozen at -20°C were assayed by the horizontal starch gel electrophoresis to detect creatine kinase (CK), esterase (EST), glucosephosphate isomerase (GPI), phosphoglucomutase (PGM), general protein (PROT).
Specimens were classified into 7 clonal groups by DNA fingerprinting. The mean of band sharing index (BSI) were 0.314±0.330 between individuals, 1.000 between individuals within a clone, and 0.149±0.077 between different clonal lines. The isozyme patterns were also useful for identification of the clones detected by DNA fingerprinting. There were no significant differences in morphological characters between clones of Ginbuna except two morphological traits.View full abstractDownload PDF (1006K) -
Yuichi Sakai, Setuo Saito, Motohiro Shimizu, Jyuro Yamada, Ichiro Mina ...1996 Volume 62 Issue 5 Pages 754-760
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe occurrence, chemical and crystallographic nature of the calculi, and their effects on the survivorship of larvae of Japanese flounder were investigated.
Two types of calculi were distinguishied as to their colors and localities; most of calculi were a milk-white one found exclusively in the urinary bladder. Orange calculi, while comparatively few in number, were in both the kidney and the urinary bladder. Both types of calculi were mainly composed of calcium phosphate in amorphous forms, but the elements of each calculus was different. Calcium and phosphorus were detected in the milk-white calculi, while sulphur in addition to calciumand phosphorus were in orange calculi. The bladders containing milk-white calculi showed no histological changes in the kidney, but when orange calculi was observed in a proximal segment or a collecting tubule of the kidney, the lumen was abnormally expanded and the epithelium cells were flattened. But calculi-holding larvae did not show a specifically higher mortality compared to normal larvae.View full abstractDownload PDF (2492K) -
Masahiko Mohri, Eiji Hanamoto, Shoichi Takeuchi1996 Volume 62 Issue 5 Pages 761-764
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSUntil now, the study of optimum water temperature for bigeye tuna has relied mainly on the use of sea surface water temperature data. However, this method has not proved entirely satisfactory since this species, in particular, occurs at considerable depths.
The present authors studied the optimum water temperature for bigeye tuna by determining the in situ temperatures at the hook depths (i.e., the depths at which bigeye tuna were caught) by the use of tuna longline fishing and oceanographic data that had been collected simultaneously in the Indian Ocean.
The results indicated that the optimum water temperature for bigeye tuna ranges between 10°C and 16°C in the Indian Ocean, which is virtually identical to the finding of 10°C-15°C for this species in the Pacific Ocean. Moreover, the present results were found to be considerably lower than the previously reported optimum water temperature of 20°C (derived from sea surface temperature data), by approximately 4°C-10°C. The present results also indicated that bigeye tuna have not been caught at depths where the temperatures were lower than 9°C or 10°C, indicating perhaps that they do not occur in waters of such low temperatures.View full abstractDownload PDF (358K) -
Kazuya Taniguchi1996 Volume 62 Issue 5 Pages 765-771
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSMarine algal succession study was carried out on artificial reefs at the depth of 1m (the cobble bottom area), 4m (Eisenia bicylis-dominated area), and 8m (crustose corallines-dominated area) from October 1988 through December 1991 off Oshika peninsula, Japan. The nudations on the reefs were given at autumn, winter and summer. At the depth of 1 and 4m, algal successions during the studing periods were classified by dominant life-form groups into four phases: pioneer, small annuals and crustaceous algae; early sere, crustaceous algae; late sere, small perennials; climax, large perennials. Crustaceous algae-dominated phase continued owing to the high grazing pressures by herbi-vores at the depth of 8m. Changes in life-form groups from early sere to climax corresponded to the arrangement of algal communities from deeper zones to shallower zones.View full abstractDownload PDF (540K) -
Hu Chen, Sadami Yada1996 Volume 62 Issue 5 Pages 772-779
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSWe have developed a mechanism in which water is injected from holes by the turning effort of the roll. The selection efficiency of the mechanism could be varied by controlling the peripheral velocity of the roll, roll interval, and roll inclination angle.
Because the surface of a roll is surrounded by a water layer caused by injection water from inside the roll, abrasion of the fish body's mucous membrane in relation to roll is prevented. When the angle of roll inclination is 10° and the peripheral velocity of rolls is below 3.0m/s, the error of selected body width in case that rolls rotate in the same direction is bigger than in the reverse direction.
A system containing eight rolls could select 126, 000 fry per hour.View full abstractDownload PDF (601K) -
Riichi Kusuda, Hiromasa Sato, Kenji Kawai, Manabu Ninomiya1996 Volume 62 Issue 5 Pages 780-784
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSIn the present study, immunobiological activities in the serum and phagocytes of yellowtail Seriola quinqueradiata immunized with formalin-killed E. seriolicida (FKC) by intraperitoneal injection were investigated to elucidate the induced protective mechanisms. Immunized fish showed 66.7% survival, while no survivors were observed in the control group 4 weeks after the challenge. Agglutinating antibody levels, alternative complement pathway activity, antibacterial activity, opsonic activity of serum were also higher in immunized than in non-immunized fish. Phagocytic activity and intracellular bactericidal activity of macrophages did not show differences between the immunized and non-immunized fish.
The results suggest that non-cellular defense activities could be important mechanisms of yellowtail in protection to E. seriolicida infection.View full abstractDownload PDF (360K) -
Keiichiro Motomatsu, Tomonori Hiraishi, Katsutaro Yamamoto, Katsuaki N ...1996 Volume 62 Issue 5 Pages 785-790
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe auditory threshold of the black rockfish Sebastes schlegeli was determined by heartbeat conditioning using six pure tone stimuli from 100Hz to 1000Hz, which was coupled with an electric shock. In order to measure the critical ratio, noise was projected to stable spectrum levels at all test frequencies of background noise. Black rockfish could hear a sound in the frequency range from 100Hz to 1000Hz, with greatest sensitivity of 90.7dB at 200Hz. The threshold at 500Hz was higher than others. Until 500Hz the critical ratio increased from 29.7dB to 59.8dB. These results show that the auditory sensitivity of the black rockfish at 500Hz is poor.View full abstractDownload PDF (457K) -
Dajia Liu, Alam AKM Nowsad, Satoshi Kanoh, Eiji Niwa1996 Volume 62 Issue 5 Pages 791-795
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSBy the elongation of setting Alaska pollack surimi paste at 30°C, the breaking force of resulting gel was slowly decreased after a rapid increase. The protein component having a molecular weight of 150K (150kDa component) was increased with the concomitant decrease of myosin heavy chain. The decrement of the breaking force and the increment of the 150kDa component were partially suppressed by the addition of 0.1% wt of serine protease inhibitors, such as phenylmethylsulfonyl fluoride, p-toluenesulfonyl-L-phenylalanine chloromethyl ketone, soybean trypsin inhibitor, and ovomucoid, to the paste, but enhanced by the addition of extract from the paste with 0.6M NaCl. Furthemore, the increment of the 150kDa component, was not observed when the paste was heated at 80 or 90°C. Therefore, there is a possibility that coexisting serine protease acts on muscle protein duing setting the pste.View full abstractDownload PDF (1618K) -
Hideo Etoh, Nobuko Murayama, Ryoichi Ishikawa, Shinji Hageshita, Kazuo ...1996 Volume 62 Issue 5 Pages 796-799
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSSearch for substances that promote attachment of marine sessile organisms using the blue mussel, Mytilus edulis galloprovincialis, is not only important in aquaculture, but also provides information on the modes of action of repellents, Curcumin, BHT, and their derivatives were found to be attachment promoting for M. edulis galloprovincialis. Metal chelates were active. Compounds capable of forming chelated structure may be active because of the presence of free metals in sea water. Some of these active compounds also showed antioxidant activity.View full abstractDownload PDF (244K) -
Mikio Tanaka, Hajime Nishino, Koji Satomi, Michio Yokoyama, Yuzaburo I ...1996 Volume 62 Issue 5 Pages 800-805
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSChanges in metmyoglobin (metMb) ratio to total Mb, viable bacterial numbers, sensory evaluation of odor, and K-value were examined for tuna fillets packaged with oxygen-nitrogen gas mixture in low gas-permeable plastic bags during 5°C storage. K-value was not affected by oxygen concentration. MetMb formation, growth of aerobic bacteria, and development of undesirable odor were inhibited by packaging containing less than 0.1% oxygen. Packaging with 4% and 9% oxygen were inferior to that with 21% oxygen (air) because of promoting metMb formation. Packaging with 70% oxygen was effective to keep the fresh red color of dorsal meat with low fat content for short time storage less than 3 days.View full abstractDownload PDF (402K) -
Tamiharu Yamashita, Nobuo Seki1996 Volume 62 Issue 5 Pages 806-812
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSSalted surimi pastes were prepared by grinding walleye pollack surimi with 3% NaCl and either 30% water or a mixture of water and the ingredient of 5 and 10% soybean protein or wheat protein. The surimi pastes were incubated at 10°C for up to 72h (setting), followed by heating at 90°C for 30min.
The added ingredients increased the gel strength greatly upon setting-heating and direct heating, while they decreased the setting response through the dilution of the relative myosin content and depressed myosin heavy chain cross-linking. However, the composite reinforcing effect of the added ingredients compensated the decrease in setting effect on the final gel strength.View full abstractDownload PDF (1619K) -
Kazuya Furuhata, Jun Kakino, Yoshifumi Miyama, Yasuwo Fukuyo1996 Volume 62 Issue 5 Pages 813-814
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (167K) -
Shoichi Takeuchi, Hisao Tsuchiya, Kazumasa Yoza, Kiyoshi Yoshihara1996 Volume 62 Issue 5 Pages 815
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (65K) -
Yoshiaki Yamada, Shizuo Iwata1996 Volume 62 Issue 5 Pages 816-817
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (151K) -
Toshitame Imai1996 Volume 62 Issue 5 Pages 818-819
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (223K) -
Toshiharu Uchiyama1996 Volume 62 Issue 5 Pages 820-821
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (180K) -
Ken Yoneyama1996 Volume 62 Issue 5 Pages 822-823
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (156K) -
Takeshi Fukumoto1996 Volume 62 Issue 5 Pages 824-825
Published: September 15, 1996
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (152K)
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