著者

Wataru Doi Hirofumi Washiyama Nobuhiro Suzuki

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.1-10, 2022 (Released:2021-12-18)

参考文献数

43

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This study investigated size at sexual maturity of the male sergestid shrimp Lucensosergia lucens (“Sakura-ebi” in Japanese). The shrimps were captured in the inner part of Suruga Bay, Japan in August 2013 using experimental trawls. Carapace length (CL), body length (BL), development of petasma, and presence of spermatophores in the terminal ampoule were documented. Probabilities of maturity as a function of CL were modeled using general linear models with a binomial and logit link function and predicted the CL at which 50% of individuals were mature (CL50). Morphologically mature males had a petasma connected with the pars astringens, and the basal part of the pars media was developed. In physiologically mature males, chambers in terminal ampoules were filled with spermatophores, including spermatozoa and appendages. CL50 (mm) was estimated to be 8.87 (=27.86 mm BL) and 7.84 (=24.65 mm BL) based on the morphological and physiological criteria, respectively. It is believed that most of the age-0 males attain sexual maturity within the first year and mature males are exploited in the autumn fishing season (October–December).

著者

Wataru Doi Ren Kikuchi Akira Mizutani Hiroyoshi Kohno

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.137-145, 2022-12-06 (Released:2022-12-06)

参考文献数

36

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To characterize the reproductive behavior of the land crab Cardisoma carnifex, their nighttime activities on the ground surface around their burrows were monitored using infrared-triggered cameras on the Iriomote-jima Island, Japan. Matings of three pairs were recorded near the entrance of the female’s burrow. The results showed that the species shares a common mating pattern of gecarcinids: hard-female mating and short courtship. The males did not exhibit courtship behavior, except for drumming on the surface sediment. The duration of copulation was longer (29, 30, and 49 min) than that in the reference data (1–10 min). After mating, males guarded their mate’s burrow and plugged the opening from the outside. By contrast, the resident crabs sometimes plug their burrows from the inside. Burrow plugging by C. carnifex males is similar to post-copulatory guarding by males of brachyurans, to prevent multiple matings by females. The non-invasive cameras revealed novel features of mating behavior of C. carnifex such as longer copulation, drumming behavior, and burrow plugging by males.