著者

Shuji Kondo Katsuyuki Hamasaki Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.41-54, 2021-04-01 (Released:2021-04-01)

参考文献数

38

被引用文献数

4

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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.

著者

Motoki Tanaka Katsuyuki Hamasaki Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.52, pp.69-78, 2023-09-01 (Released:2023-09-01)

参考文献数

24

被引用文献数

1

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We conducted two laboratory experiments to evaluate the dietary effects of phytoplankton and zooplankton on the larval survival, duration and growth of the amphidromous atyid shrimp Atyopsis spinipes. In the first experiment, commercially preserved or cultured phytoplankton Tetraselmis sp. and cultured zooplankton rotifers were used to rear larvae. In the second experiment, cultured Tetraselmis and rotifers were used to feed larvae for 17 days after hatching, after which the effect of supplementing their diet with Artemia nauplii was tested. The effects of different culture vessel volumes (8 mL and 40 mL) on larval performance were also assessed. In the first experiment, larvae fed only with preserved Tetraselmis did not survive to the juvenile stage, whereas larvae fed with rotifers showed better survival and development. In the second experiment, most larvae receiving Artemia supplementation survived to the juvenile stage. Larvae cultured in larger containers (40 mL) had significantly higher survival rates than those cultured in smaller containers (8 mL). The present study demonstrates larval culture methodologies for A. spinipes that can promote the development of larvae into the juvenile stage with high survival rates.

著者

Katsuyuki Hamasaki Minako Ishii Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.17-27, 2021-02-23 (Released:2021-02-23)

参考文献数

51

被引用文献数

1 8

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We investigated the seasonal variability in fecundity and egg size in a Petrolisthes japonicus population by monthly sampling for one year on an intertidal cobble and boulder shore on the Boso Peninsula, Japan. Fecundity (number of eggs per brood) was determined for ovigerous females with non-eyed or eyed eggs in early (May and June), middle (July) and late (August and September) breeding periods. The long and short diameters of non-eyed eggs were measured, and the egg volume was calculated. Fecundity was positively correlated with female body size and found to be greater in the middle breeding period than in the early and late breeding periods. Egg loss occurred during embryogenesis, the egg loss rate being calculated as 44.6%, 14.8% and 30.2% from the non-eyed to the eyed egg stages in the early, middle and late breeding periods, respectively. Egg size decreased linearly from the early to the late breeding periods. It is inferred that the seasonal variability in reproductive output, fecundity and egg size in P. japonicus may be regulated by female nutritional conditions and seasonal fluctuations of food production for larvae, as well as a trade-off between the number and size of eggs in a brood.

著者

Sota Nishimoto Katsuyuki Hamasaki Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.52, pp.23-30, 2023-02-18 (Released:2023-02-18)

参考文献数

23

被引用文献数

2

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We studied the artificial incubation method of red swamp crayfish Procambarus clarkii embryos using cell culture plates. In the first experiment, cleavage stage embryos or egg-nauplius stage embryos were individually cultured at 20°C in the well of cell culture plates with different water volumes per well [12 well (4 ml), 24 well (2 ml), 48 well (1 ml) and 96 well (0.25 ml)]. In the second experiment, egg-nauplius stage embryos were cultured using 12-well plates at 15, 20 and 25°C. Almost all cleavage stage embryos died without hatching. Egg-nauplius stage embryos survived to hatch. In the 96-well plates, the embryo hatched, but all first instar juveniles died soon. In other plates, the mortality of the first instar juveniles tended to increase with decreasing culture water volume; particularly, high mortality was recorded in the 48-well plates. Hatching and moulting rates were high at 15°C and 20°C, but approximately half of the first instar juveniles died at 25°C. We concluded that a 12-well cell culture plate (4 ml per well) is suitable for incubating P. clarkii embryos to hatch and the first instar juveniles to moult to the second instar at 15–20°C.

著者

Yohei Kawakami Katsuyuki Hamasaki Shuji Kondo Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.52, pp.1-13, 2023-01-18 (Released:2023-01-18)

参考文献数

44

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We examined the survival and moulting of starved early-stage-zoeae of atyid shrimps—amphidromous Paratya compressa and landlocked Paratya improvisa—under different salinity and temperature conditions to attain a better understanding of larval adaptation to freshwater environments in landlocked shrimp. The first stage zoeae were cultured without foods under 25 combinations of different salinity (0, 8.5, 17, 25.5, and 34 ppt) and temperature (20, 23, 26, 29, and 32°C) levels. The larvae of P. compressa did not moult, whereas larvae of P. improvisa are lecithotrophy and moulted to the third stage zoeae at 0–25 ppt (and rarely to the fourth stage zoeae at 8.5–25 ppt). However, all larvae lost the ability to moult in open seawater conditions of 34 ppt salinity. The larval survival time was not largely different between these two species, even though the first stage zoeae of P. improvisa were much larger than those of P. compressa. The larvae of P. improvisa advanced the development shorter rather than surviving longer under starvation conditions. These findings suggest that the starvation tolerance, that is, lecithotrophic faster developmental rate of early stage zoeae of landlocked P. improvisa, adapted better to stay in or near parental habitats as well as to limited food conditions in freshwater environments.

著者

Tetsuya Sanda Tomohito Shimizu Shigeki Dan Katsuyuki Hamasaki

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.129-135, 2022-11-09 (Released:2022-11-09)

参考文献数

23

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Temperature is one of the most important environmental factors affecting the geographic distribution of ectotherms. We evaluated the low- and high-temperature tolerance limits of juveniles of two mud crab species, Scylla paramamosain and Scylla serrata, which are distributed in temperate and subtropical/tropical areas in Japan, respectively. Experiments were performed twice for S. paramamosain and four times for S. serrata using laboratory-raised juveniles. The juveniles were stocked in small containers, and the temperature was reduced or raised by 1°C every 24 h. The critical low or high temperatures (CLT or CHT) were estimated as the temperatures at which 50% of test juveniles ceased walking behaviour or died. The estimated CLT values for walking and survival were summarised as 8.4±0.7°C (mean±standard deviation) and 6.4±0.9°C in S. paramamosain and 9.6±0.6°C and 7.4±0.4°C in S. serrata, respectively. The CHT for walking could not be estimated, as almost all surviving juveniles exhibited walking behaviour, whereas the estimated CHT values for survival were summarised as 39.0±0.4°C in S. paramamosain and 39.1±0.6°C in S. serrata. Thus, interspecific variation in low-temperature adaptation was evident, and S. paramamosain are adapted to the lower-temperature environment.

著者

Sota Nishimoto Katsuyuki Hamasaki Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.103-110, 2022-09-17 (Released:2022-09-17)

参考文献数

32

被引用文献数

3

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The red swamp crayfish Procambarus clarkii is an invasive alien species worldwide but it was commercially exploited. Laboratory studies have been conducted to examine the reproductive aspects of this species, pairing males and females for 1–5 days, as a basis for developing the control measures for invasive populations and improving aquaculture technologies. However, the effect of pairing periods on the mating and spawning success is largely unknown, and the present study therefore aimed to elucidate the effect of different periods (one, five and 10 days) in this species. The pairs were videorecorded for each entire pairing period, and the length of pairing did not significantly affect copulation or spawning. Copulation was prolific on the first day and its intensity was similar among the test groups, indicating that a one-day pairing period is sufficient for successful mating in P. clarkii under laboratory conditions.

著者

Tetsuya Sanda Tomohito Shimizu Shigeki Dan Katsuyuki Hamasaki

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.87-93, 2021-07-03 (Released:2021-07-03)

参考文献数

21

被引用文献数

2

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Cannibalism is considered a major cause of mortality among juveniles in nursery cultures of the mud crab Scylla serrata. Size grading is recommended as an effective measure to mitigate cannibalistic behavior; however, little is known about how body size differences influence cannibalistic episodes between juvenile individuals. We conducted one-to-one match experiments using hatchery-raised juveniles with carapace width between 12.5 and 33.3 mm. Two crabs were placed in an experimental arena for 24 h, and survival and pereiopod loss were subsequently observed. Large crabs always preyed on small crabs, and the probability of cannibalistic behavior significantly increased with the increasing relative size difference [RSD=1−(size of small crab)/(size of large crab)]. The loss of chelipeds and walking legs in the surviving small crabs amounted to 25% and 38%, respectively, and the proportion of lost walking legs increased with the increasing RSD, indicating the stronger aggressive behavior of larger crabs. This study suggests that maintaining size differences below the RSD threshold (0.34) at which 50% of the small crabs are cannibalized by large crabs would be an effective strategy to contain the occurrence of cannibalism in mud crab nursery cultures.