Maturation, Spawning, Molting Cycle, and Growth of Eyestalk-ablated and Unablated Argentine Red Shrimp, Pleoticus muelleri Bate(Decapoda, Solenoceridae).

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The present study investigated the maturation, spawning, molting cycle, and growth of eyestalkablated (group A) and unablated (group B) P. muelleri reared in a tank. In adition, the adequency of gonadosomatic index (GSI) and coloration of ovary for the purpose of assesing the stage of the gonadal maturation was evaluated. The assesment of the stage of ovarian maturation by gonadosomatic index and the coloration showed that P. muelleri can spawn only after attaining Stage-IV (GSI 10.3±1.9 %) . The smallest unablated spawner had a body weight of 18.3 g and completely spawned 268, 000 eggs 16 days after the onset of the experiment. No significant difference was observed between the molting cycle of ablated (21.2±4 days) and unablated (22.4±3 days) females. However, the molting cycle increased with an increase of spawner size between 4 and 28 g. The growth rates of carapace length and body weight per momth between group A and B showed no significant difference. Based on the maturity, spawning, and mating rates, it was considered that a frequent spawners were over 18 g in size. The ovarian development in both groups as slow and steady. Females attained Stage-I 4-5 days after molt and then took another 6-8 days to spawn. The interval between the first and the second spawnings was 7 days. There was no a significant difference between the spawning rates of groups A and B.
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