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

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.