Comparison of some reproductive characteristics of farmed and wild white shrimp males Litopenaeus vannamei (Decapoda: Penaeidae)
We rated some reproductive characteristics of white shrimp Litopenaeus vannamei (Boone, 1931)males using 46 farmed individuals (weighing 21.42±0.56 g) and 40 wild individuals (weighing 36.10±0.72 g).In farmed shrimps, spermatophore mean weight was 8.94±0.51 mg; total mean sperm count was 3.90±0.27 x...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2007 |
| Country: | México |
| Institution: | Universidad Nacional Autónoma de México |
| Repository: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:44955121 |
| Online Access: | https://www.redalyc.org/articulo.oa?id=44955121 |
| Access Level: | Open access |
| Keyword: | Biología males reproduction Litopenaeus vannamei |
| Summary: | We rated some reproductive characteristics of white shrimp Litopenaeus vannamei (Boone, 1931)males using 46 farmed individuals (weighing 21.42±0.56 g) and 40 wild individuals (weighing 36.10±0.72 g).In farmed shrimps, spermatophore mean weight was 8.94±0.51 mg; total mean sperm count was 3.90±0.27 x 106in each spermatophore; and mean percentage of normal sperm was 86.9±0.37 %. In wild individuals, the respectivevalues were 30.68±2.32 mg; 6.22±1.09 x 106; and 62.1±3.56 %. In both groups, the differences betweenright and left spermatophore were not significant (p<0.01). There were significant differences in spermatophoreweight and percentage of normal sperm between farmed and wild shrimps; sperm counts differences, however,were not significant (p<0.01). The relationship between spermatophore weight (Ws) and individual weight (Wo)was Ws (mg)=1.23 (Wo)-17.34 (r2=0.89), in farmed shrimps; and Ws (mg)=2.57 (Wo)-60.04 (r2=0.64), in wildones. In cultivated organisms, the relationship between sperm counts (Cs) and individual weight (Wo) was Cs (x106)=1.13*10-4* (Wo) 3.361 (r2= 0.85); and versus spermatophores weight was Cs (x 106)=0.439* (Ws) 0.984(r2= 0.90). In wild organisms, there was no correlation. The proportion of normal sperm ranged from 79.8 to 95.2% (86.9±0.37 %) and from 14.0 to 91.5 % (62.1±2.52 %), in farmed and wild shrimps, respectively. The mostfrequent abnormalities in both farm and wild animals were sperm without spike (49.3 % and 76.6 %, respectively)and irregular shape (35.8 % and 17.7 %). The less frequent occurrences were those of bent (10.2 % and4.29 %) and double spike (4.7 % and 1.41 %). Rev. Biol. Trop. 55 (1): 199-206. Epub 2007 March. 31. |
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