title: Comparison of some reproductive characteristics of farmed and wild white shrimp males Litopenaeus vannamei (Decapoda: Penaeidae).
abstract: 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 10(6) in each spermatophore; and mean percentage of normal sperm was 86.9 +/- 0.37%. In wild individuals, the respective values were 30.68 +/- 2.32 mg; 6.22 +/- 1.09 x 10(6); and 62.1 +/- 3.56%. In both groups, the differences between right and left spermatophore were not significant (p < 0.01). There were significant differences in spermatophore weight 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 wild ones. In cultivated organisms, the relationship between sperm counts (Cs) and individual weight (Wo) was Cs (x 10(6)) = 1.13 * 10(-4*) (Wo) 3.361 (r2 = 0.85); and versus spermatophores weight was Cs (x 10(6)) = 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 most frequent 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 % and 4.29%) and double spike (4.7% and 1.41%).
authors.affiliation: Instituto de Ciencias del Mar y Limnologia, Unidad Académica Mazatlin, Universidad Nacional Autónoma de México, Aptdo. 811, Mazatlán 82000, Sinaloa, México. rendon@ola.icmyl.unam.mx
authors.forename: Sergio
authors.initials: S
authors.lastname: Rendón Rodríguez
authors.forename: Emilio
authors.initials: E
authors.lastname: Macías Regalado
authors.forename: José Antonio
authors.initials: JA
authors.lastname: Calderón Pérez
authors.forename: Arturo
authors.initials: A
authors.lastname: Núñez Pastén
authors.forename: Rafael
authors.initials: R
authors.lastname: Solís Ibarra
mesh_terms: D000818:Animals; D000835:Animals, Wild; D017756:Aquaculture; D008297:Male; D033561:Penaeidae / Q000033:anatomy & histology / Q000502:physiology*; D012098:Reproduction / Q000502:physiology; D013076:Sperm Count; D013093:Spermatogonia / Q000254:growth & development*