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Volume 69, Issue 3
Displaying 1-25 of 25 articles from this issue
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KATSUTOSHI ARAI2003 Volume 69 Issue 3 Pages 318-321
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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MINEO YAMAGUCHI2003 Volume 69 Issue 3 Pages 322-325
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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TAKAO OJIMA2003 Volume 69 Issue 3 Pages 326-329
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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YOSHIO HIRAI, HIDEYUKI NISHINOKUBI2003 Volume 69 Issue 3 Pages 330-336
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSThe actual conditions of the catch and discards of by-catch from a small-scale trawl fishery in the Ariake Sea have not yet been clarified. Therefore, 14 small-scale trawl fishing sessions in the Ariake Sea were carried out to investigate this quantitatively. The length and weight of catch were measured and the number and weight of discards were calculated. The results showed that the total amount of catch was much greater in the summer than in the winter. The discard percentage based on the total catch in weight ranged from 36-67% with an average of 53%. An average of 93% of the total discards in weight was bony fish and cartilaginous fish. The main discarded species in unmarketable fishes were thornback ray Platyrhina sinensts and genko sole Cynoglossus interruptus. The main discarded species in marketable fishes was frog flounder Plcuronickthys cornutus, which is the target fish of small-scale trawl fishery in the Ariake Sea.View full abstractDownload PDF (981K) -
NORIYUKI HORIE, YOSHIAKI YAMADA, AKIHIRO OKAMURA, SATORU TANAKA, TOMOK ...2003 Volume 69 Issue 3 Pages 337-346
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSWe sought effective hormonal treatments to induce ovarian maturation and ovulation in the common Japanese conger Conger myriaster by using females cultured for 1.5 years from elver. Effective treatments were human chorionic gonadotropin (HCG; 100 IU kg-1 body weight every 2 weeks) in combination with one of three maturation-inducing steroids* (2mg kg-1 body weight). Of these treatments, the combination of HCG and 20β-S seemed to be the most effective. In all fish treated with this combination that survived the experiment, the oocytes developed to the migratory nucleus stage. The survival rate of the HCG-treated females was 79%, and buoyant eggs were obtained from 42% of the females injected with 20/β-S. The fertilization rate (no. eggs fertilized/total no. eggs ovulated) was 61% ±30%. Furthermore, handling stress seemed to affect the egg quality of C. myriaster, because fertilized eggs were not obtained from females that had been handled more than 12 times. *Maturation-inducing steroids used: 17α, 20/β, 21-trihydroxy-4-pregnen-3-one (20/β-S), 17α, 20/β-dihydroxy-4-pregnen-3-one (DHP), and 17α-hydroxy-4-pregnen-3, 20-dione (17αP).View full abstractDownload PDF (1169K) -
CHIAKI IMADA, TAKESHI KOBAYASHI, NAOKO HAMADA-SATO, ETSUO WATANABE2003 Volume 69 Issue 3 Pages 347-351
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSSixteen marine sediment samples collected from Tokyo Bay, Sagami Bay, Suruga Bay and Enshu-Nada were incubated under increased pressure (1-600 atm). Two barophilic microbes were obtained from Sagami Bay at a depth of 1, 400m and Ensyu Nada at a depth of 300m. They were referred to as strains SA-6 and EN-16, respectively. Both strains required seawater for their growth which indicated that they were marine in origin. From the taxonomic characterization, strains SA-6 and EN-16 were identified as Kurchia and Acinetobacter, respectively. The activities of protease and α-amylase produced by strain EN-16 increased much more than 1 atm under increased pressure.View full abstractDownload PDF (729K) -
KENSAKU AZUMA, HIROYUKI HIRAGA, IZUMI KINOSHITA2003 Volume 69 Issue 3 Pages 352-358
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSThe ayu Plecoglossus altivelis altivelis larvae were collected with an aqualamp (250W) from the Shimonokae estuary and the adjacent sandy beach in their three reproductive seasons (1st: December 1996-March 1997, 2nd: December 1997-March 1998, 3rd: December 1998-February 1999). Ayu were collected abundantly both in the estuary and sandy beach in the 1st and 2nd seasons. In the 3rd season, few ayu were collected from the sandy beach, although a large number of ayu were collected from the estuary. The daily precipitation in the 3rd hatching period (November-December) was less than that in the 1st and 2nd periods. These results suggest that the river discharge during the duration of downstream sweep of larvae influenced the dispersion of larvae to the sea.View full abstractDownload PDF (829K) -
KAZUNORI ARAYAMA, HITOSHI IMAI, HIROSHI KOHNO, KIYOSHI FUJITA2003 Volume 69 Issue 3 Pages 359-367
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSThe seasonal occurrence and abundance, changes of feeding habits and development of digestive tract were examined on the larvae and juveniles of the Japanese whiting Sillago japonica. The fish were collected from both offshore, ca. 100m off the shoreline at the depth of <1m, and from the shoreline areas in the sandy beaches surf zone of Tateyama Bay in the period from April 1999 to March 2001. The Japanese whiting occurred mainly from July to September and was much more abundant in the offshore area than in the shoreline area, 14, 106 vs 302 individuals. However, no difference was detected on the SL, mean ±SD=12.9±4.3mm in the offshore vs 13.2±6.8mm in the shoreline area in 1999. The main food was calanoid copepods in the fish smaller than 14.0 mm SL, and polychaeta larvae and Mysis were added at 14.0mm and 17.0mm SL, respectively. The surf zone, especially the offshore area, was considered to be an important nursery area for the larvae and juveniles of the Japanese whiting.View full abstractDownload PDF (1207K) -
MITSUTAKU MAKINO, WATARU AKAMOTO2003 Volume 69 Issue 3 Pages 368-375
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSFor 1300 years the Japanese Fishery Institution has adhered to a philosophy of "Resource Preservation and Breeding by Resource Users Themselves". Recent resource management policies such as the Resource Management Agreement System or the Agreement System provided in the TAG Law are also voluntary agreements conducted by local fishermen, and are worth promoting in view of their administrative cost ellectiveness, flexibility and political philosophy. On the other hand, the US-type resource management is basically a dual system, which means "Resource Management by the Government, and Resource Use by Citizens". Therefore, the viewpoint of "resource management via daily fishing activities" is important for Japanese fishery science.View full abstractDownload PDF (1274K) -
ATSUSHI FUKUI, TAKAO TSUCHIYA, YUICHI KANBE, KENJI KITA, ITSURO UOTANI2003 Volume 69 Issue 3 Pages 376-379
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSThe relationship between molting and water temperature, and molting behavior in adult sergestid shrimp, Sergia lucens, were studied under laboratory conditions. The rate of molted shrimp increased with rising water temperature, being 13.0% at 10°C, 47.3% at 14°C and 77.2% at 22°C. Under day 12°C-night 18°C and day 18°C-night 12°C conditions, the rate of molting was higher when the temperature was 18°C than when 12°C. The intervals between each molting were 7-12 days, and carapace length increased by 0.4-1.9% after each molt with the entire process requiring 20-40 seconds. Shrimps remained on their sides on the tank bottom for approximately 20-30 minutes prior to molting and for 60-100 minutes following molting.View full abstractDownload PDF (507K) -
TAKESHI SEKIGAWA, TOYOMI TAKAHASHI, TETSUYA TAKATSU, YASUNORI SAKURAI2003 Volume 69 Issue 3 Pages 380-386
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSTo clarify the maturation process of female fat greenling Hexagrammos otakii, histological observations were carried out on the ovaries of samples collected in Kikonai Bay, southern Hokkaido, from June 1999 to May 2000. The maturation process within the size range examined (170-460 mm in standard length) was divided into 6 phases: immature (recovery), oil droplet, yolk formation, maturation, spawning, and spent. Based on changes of the development stage and diameter of oocytes, the development form of fat greenling was thought to belong to the "group-synchronous oocyte development" type. The spawning season in this region was assumed to occur from November to January, with a peak occurring between mid-November and late December.View full abstractDownload PDF (1464K) -
HITOSHI SANUKI, MASAHIRO HATA, MASAAKI TAKEUCHI2003 Volume 69 Issue 3 Pages 387-392
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSThe distribution of calcium bound to parvalbumin (PA) in water-soluble fraction of ordinary muscles from four species was studied. About 65% of the calcium existed in the PA fraction with carp and pacific cod, however, only about 10% of the calcium existed in the PA fraction with pacific saury and rainbow trout. Molecular masses of these PAs were 10-12.5 kDa. Three and two PA isoforms were detected with carp, pacific cod and rainbow trout, and with pacific saury, respectively. The mobility and relative ratio of PA isoforms were very different among fish species.View full abstractDownload PDF (879K) -
YOSHIHIRO ASANO, YOSHIAKI ITOH, PANTIP SUWANSAKORNKUL, ATSUSHI OBATAKE2003 Volume 69 Issue 3 Pages 393-398
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSWashing procedures of shortfin lizardfish meat are unable to remove the proteolytic activity degrading myosin heavy chain during the preheating process of salted meat paste. NaCl promoted the activity, and sugars and a rice wine did not affect it at all. With duration especially at 40°C, decrease in the gel strength was accompanied by a remarkable degradation of myosin heavy chain. It was therefore suggested that myosin heavy chain in the salted meat paste of shortfin lizardfish was susceptible to proteolysis during the processing of kamaboko resulting in the weakening of the gel.View full abstractDownload PDF (880K) -
KENICHI SAKAGUCHI, NOBORU OCHIAI, CHAN SUN PARK, MAKOTO KAKINUMA, HIDE ...2003 Volume 69 Issue 3 Pages 399-404
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSTo quantify the degree of discoloration in faded laver Porphyra yezoensis the levels of tristimulus (L*, a*, b*) were determined using a color difference meter. When the degree of discoloration of the thalli was moderate to severe, a*-values were negative. A negative of a*-value meant that the color of thalli changed from red to green. With increasing decolorization, the a* levels decreased while levels of L* and b* increased beyond normal tristimulus values. When the *-, a*-, and b*-values were compared with the levels of chlorophyll a, phycoerythrin, and phycocyanin, the a*-values correlated best with these pigments. To restore color in faded laver, thalli were treated with four concentrations of NH4-N (1, 10, 25 and 50mg/L seawater). It was found that seawater enriched with 25mg/L NH4-N promoted the best recovery of moderately or seriously faded laver within 24h. After this treatment, the levels of chlorophyll a, phycoerythrin and phycocyanin increased to 140-186%, 116-153% and 116-157%, respectively (relative to levels in untreated thalli). It is important to note that this treatment was only effective when the laver had a minus a*-value and when cells in the tissue were without granulated cytoplasmic contents. This study demonstrates a rapid method for evaluating the degree of discoloration of harvested Porphyra and offers a simple treatment method to restore thalli color.View full abstractDownload PDF (752K) -
SEIICHI KITAKAMI, KOSAKU YASUNAGA, YURIKO MURAKAMI, YOICHI ABE, KEN-IC ...2003 Volume 69 Issue 3 Pages 405-413
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
JOURNAL FREE ACCESSFrozen surimis from walleye pollack, which contained 8% sorbitol and 8% sorbitol plus either 0.2% sodium polyphosphate or 3.0% NaCl, were ground with 3% NaCl (final concentration) and also with 0-0.25% KCO to make the pH value between 6.8-8.7. The salt ground meat was preheated at 25°C for 8 h, and subsequently heated at 90°C for 30 m. The breaking strength (BS) and breaking strain (bs) of the heated gel were measured as a function of preheating time. The pH-dependence of the gel forming ability and the effect of polyphosphate salt on it were investigated from the time-dependent change in the measurements. The rate of increase in BS also with gel stiffness (Gs=BS/bs) was found to be the highest among the heated gels at around pH 7.5-7.8 when the frozen surimi with polyphosphate salt was applied, whereas the rate of increasing rate of BS and Gs of the heated gel from two lots of frozen surimi without polyphosphate salt was highest at around pH 7.6-8.5. These results indicated that the most profitable pH condition for the heat-induced formation of gel from frozen surimi varied between the lots with and without adding polyphosphate salt.View full abstractDownload PDF (935K) -
TAKAAKI KAYABA, TAKASHI SUGIMOTO, SHINJI ADACHI, KOHEI YAMAUCHI2003 Volume 69 Issue 3 Pages 414-416
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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MASAHIRO NOTOYA2003 Volume 69 Issue 3 Pages 418-419
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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SEITOKU KUDOH2003 Volume 69 Issue 3 Pages 420-421
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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YOSHIO KAWAMURA2003 Volume 69 Issue 3 Pages 422-423
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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TAKEHIKO MANABE, KYOSUKE NIWA, SHIGEYOSHI OKAMOTO, TETSUYA NISHIKAWA, ...2003 Volume 69 Issue 3 Pages 424-425
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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MlTSURU FUSEYA2003 Volume 69 Issue 3 Pages 426-427
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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TATSUYA SEKI2003 Volume 69 Issue 3 Pages 428-429
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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KENICHI KOGA, KOUICHIROU OOKUSHI, HIROYUKI ARAKI, HIROYUKI YAMANISHI2003 Volume 69 Issue 3 Pages 430-431
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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YUSHO ARUGA2003 Volume 69 Issue 3 Pages 432-433
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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[in Japanese]2003 Volume 69 Issue 3 Pages 439-443
Published: May 15, 2003
Released on J-STAGE: February 01, 2008
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