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A great variety of reproductive strategies have been observed among brachyurans. Most strategies aim to maximize offspring survival, maintain population stocks, and differentially increase parental genes. We hypothesized that reproductive strategies of a symbiont are not sim- ilar to other related but non-symbiotic brachyuran crabs. To test this hypothesis, we analyzed the following parameters of the pea crab Austinixa aidae, symbiont to ghost shrimp Callichirus spe- cies, from the southeastern coast of Brazil: fecundity and its seasonal variation, egg size and vol- ume, number of developing eggs, and the relationship between fecundity and crab size and weight. Reproductive parameters of A. aidae were strongly related to the mean size of individuals. Females reached sexual maturity at 5.1 mm carapace width, corroborating previous allometric research. A positive correlation between number of eggs with body size and weight was found. The reproductive period of this species was classified as seasonally continuous. Many early stage eggs were found in all reproductive periods, indicating high reproductive potential. Additionally, the proportion of early stage eggs found during the period of the study indicates a rapid embry- onic development. The effects of latitude, environmental conditions, and host mesohabitat charac- teristics in combination influence reproduction in symbiotic species.

sexuality and early development in aquatic organism/aquatic biology/sexuality and early development in aquatic organisms

Symbiotic reproductive strategies of Austinixa aidae in the southwestern Atlantic Ocean, Brazil: sexual maturity of females, fecundity and egg features