Histological alterations in gills of shrimp Litopenaeus vannamei in low‐salinity waters under different stocking densities: Potential relationship with nitrogen compounds |
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| Authors: | Marcela G Fregoso‐López María S Morales‐Covarrubias Miguel A Franco‐Nava Javier Ramírez‐Rochín Juan F Fierro‐Sañudo Jesús T Ponce‐Palafox Federico Páez‐Osuna |
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| Institution: | 1. Posgrado en Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Universidad Nacional Autónoma de México, Mazatlán, Sinaloa, Mexico;2. Centro de Investigación en Alimentación y Desarrollo, A.C., Mazatlán, Sinaloa, México;3. Instituto Tecnológico de Mazatlán, Mazatlán, Sinaloa, México;4. Programa de Posgraduado en Recursos Acuáticos, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Mazatlán, Sinaloa, México;5. Posgrado en Ciencias Agropecuarias, Colegio de Ciencias Agropecuarias, Universidad Autónoma de Sinaloa, Culiacán, Sinaloa, México;6. Escuela Nacional de Ingeniería Pesquera, Lab. Bioingeniería Costera, Centro Multidisciplinario de Bahía de Banderas, Universidad Autónoma de Nayarit, Nayarit, México;7. Instituto de Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Universidad Nacional Autónoma de México, Mazatlán, Sinaloa, México;8. Miembro de El Colegio de Sinaloa, Centro, Culiacán, Sinaloa, Mexico |
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| Abstract: | Two experimental modules with different stocking densities (M1 = 70 and M2 = 120 shrimp /m2) were examined weekly over a culture cycle in tanks with low‐salinity water (1.9 g/L) and zero water exchange. Results showed survival rates of 87.7 and 11.9% in M1 and M2, respectively. Water temperature, pH, dissolved oxygen, electrical conductivity and chlorophyll a were not significantly (p > .05) different between modules. In contrast, the concentrations of nitrogen compounds were significantly (p < .05) different between modules, except nitrite‐N (M2 were 2.31 ± 1.38 mg/L N‐TAN, 0.18 ± 0.49 mg/L N‐NO2? and 6.83 ± 6.52 mg/L N‐NO3?; in M1: 0.97 ± 0.73 mg/L N‐TAN, 0.05 ± 0.21 mg/L N‐NO2? and 0.63 ± 0.70 mg/L N‐NO3?). When waters of both modules reached higher levels of ammonia and nitrite, histological alterations were observed in gills. The histological alterations index (HAI) was higher in M2 (5‐112) than in M1 (2‐22). |
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| Keywords: | gills histopathology
Litopenaeus vannamei
low‐salinity water water quality |
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