Growth and reproduction of eyestalk ablated penaeus canaliculatus (Olivier, 1811) (crustacea:Penaeidae) |
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| Institution: | 1. Department of Chemistry, Tsinghua University, Beijing, 10084, China;2. College of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;1. National Centre for Aquatic Animal Health, Cochin University of Science and Technology, Fine Arts Avenue, Kochi, Kerala 682016, India;2. Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology, Fine Arts Avenue, Kochi, Kerala 682016, India;1. Laboratorio de Biología Celular y Molecular, Departamento de Biotecnología Marina, Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana #3918, Ensenada, Baja California C.P. 22860, México;2. Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California (UABC), Av. Tecnológico s/n, Mesa de Otay, Tijuana, Baja California C.P. 22390, México;3. Laboratorio de Neurofarmacología Marina, Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, Juriquilla, Querétaro C.P. 76230, México;4. Laboratorio de Ecofisiología de Organismos Acuáticos, Departamento de Biotecnología Marina, Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana #3918, Ensenada, Baja California C.P. 22860, México;1. Department of Obstetrics and Gynecology, Inner Mongolia Medical university, Hohhot, Inner Mongolia, 010050, China;2. Inner Mongolia Key Laboratory of Animal Genetics Breeding and Reproduction, Hohhot, Inner Mongolia, 010018, China |
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| Abstract: | The effects of single (unilateral) eyestalk ablation on the growth and reproduction of male and female Penaeus canaliculatus (Olivier) were compared with those of unablated (control) individuals. Prawns ≤ 10 mm in carapace length ablated in the premoult stage suffered high mortality. Prawns recognized as immature when ablated always moulted irrespective of their moulting stage; ovaries in females did not become vitellogenic nor did spermatogenesis occur in males. Mature females ablated in the premoult stage underwent moulting while those in the postmoult stage developed mature ovaries. Mature males in the postmoult or intermoult stages took longer to moult than those that were in the premoult stage when ablated. The Von Bertalannfy equations describing growth in P. canaliculatus were as follows: Lt = 25.6 1?e?0.0756(t?to)]for ablated males; Lt = 25.3 1?e?0.059(t?to)] for unablated males; Lt= 37.2 1?e?0.048(t?to)] forablated females; Lt = 33.4 1?e?0.044(t?to)] for unablated females. Differences in the growth rates were a result of both the moulting frequency and the increment in size at moult. However, the relative contribution of these two factors to growth varied with sex as well as with size. In both sexes, ablated individuals became sexually mature earlier; females spawned earlier. Although moulting frequency and the total number of spawns were greater for ablated females, the mean number of eggs produced (per spawn as well as total) by unablated females was higher and the mean hatching success was better. |
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