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Nutritional vulnerability in zoeal stages of the yellowline arrow crab Stenorhynchus seticornis (Brachyura: Majoidea)
Knowledge of the critical points in larval stages is essential to evaluate the physiological state of the larvae in their natural environment. This study investigated the nutritional vulnerability index (NVI) of the first (ZI) and second (ZII) zoeal stages of Stenorhynchus seticornis. Zoeae were assigned to two experiments: 1) point-of-no-return (PNR) consisting of treatments with increasing days of starvation and subsequent days of feeding; 2) point-of-reserve-saturation (PRS) consisting of treatments with increasing days of feeding and subsequent days of starvation; and control treatments: continuous starvation (CS) and continuous feeding (CF). Mortality was used to estimate the time at when 50% of initially starved larvae (PNR50) lost the ability to molt to the next stage, and when 50% of initially fed larvae (PRS50) were capable of molting to the next stage. Development time of ZI and ZII under CF was 4.4±1.2 and 5.1±1.8 days, respectively. Mortality in CF was 30 and 52% for ZI and ZII, respectively. For ZI, PNR50 and PRS50 were 1.0±0.0 and 2.1±1.0 days, respectively. The estimated NVI for ZI was 2.2, which indicates that S. seticornis depends on exogenous food and is considered planktotrophic during the first larval stage.
MF17145 Accepted 18 December 2017
© CSIRO 2017