Journal ArticleDOI
Sperm Quality Over Consecutive Spermatophore Regenerations in the Pacific White Shrimp Litopenaeus vannamei
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TLDR
This procedure allows selecting individuals with high baseline sperm quality based on significant correlations between baseline and regenerated sperm quality observed in the present work, and indicates that the existing spermatophores at stocking of males should be expelled to have higher sperm quality in regenerated sperMatophores.Abstract:
The reproductive potential of males plays an important role in the productivity of captive penaeids. Males present a large variability in their reproductive potential, and thus the selection of appropriate males for reproduction is highly desirable. The present study compares sperm quality at the beginning of the experiment (baseline values) with variations in sperm quality as a result of consecutive spermatophore regenerations. This was done to evaluate possible predictive criteria for optimal sperm quality based on morphological and biochemical criteria in pond-reared Pacific white shrimp Litopenaeus vannamei males. Sperm quality was similar between left and right spermatophore. Sperm count and proportion of normal sperm increased by 86 and 65% (P < 0.05) respectively, from baseline values to third spermatophore regeneration. Proportion of dead sperm progressively decreased with consecutive regenerations, attaining values 33% lower by the third regeneration, compared to baseline values. This indicates that no decrease in sperm quality occurs in L. vannamei during consecutive regenerations and that the existing spermatophores at stocking of males should be expelled to have higher sperm quality in regenerated spermatophores. Furthermore, this procedure allows selecting individuals with high baseline sperm quality based on significant correlations between baseline and regenerated sperm quality observed in the present work. Baseline values of glucose concentration in the hemolymph were positively correlated to baseline values of sperm count (r = 03, P < 0.05). In contrast, baseline values of several lipids in the hemolymph were negatively correlated to several traits of sperm quality at first sampling (baseline values) or at first regeneration. These results are discussed in terms of nutritional requirements of males and of possible predictive criteria of sperm quality.read more
Citations
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Journal ArticleDOI
The reproductive conditions of male shrimps, genus Penaeus, sub-genus Litopenaeus (open thelyca penaeoid shrimps): a review.
TL;DR: This review evaluates the current knowledge on male reproduction of open thelyca penaeoid shrimps, a group of shrimp that belongs to the genus Penaeus, sub-genus Litopenaeus, and presents a unique reproductive model, characterized by complex spermatophores and thelycas without seminal receptacles.
Journal ArticleDOI
Males also have their time of the month! Cyclic disposal of old spermatophores, timed by the molt cycle, in a marine shrimp
TL;DR: This is the first report of males of any animal species exhibiting endogenous reproductive cycles, as do females, and of the finding that spermatozoa have a predetermined expiry date, a feature that may possibly contribute to male fitness.
Journal ArticleDOI
Genetic diversity status of White shrimp Penaeus (Litopenaeus) vannamei broodstock in Mexico
TL;DR: Broodstock management appears to have maintained genetic diversity, because mean allele numbers were similar to the pooled values from a single hatchery sampled between 2000 and 2002, however, with an observed heterozygosity below Hardy–Weinberg expectations and a high mean inbreeding coefficient it would be timely to introduce cross breeding among hatcheries to reduce the risk of inbreeding depression.
Journal ArticleDOI
Spermatophore cryopreservation and artificial insemination of black tiger shrimp, Penaeus monodon (Fabricius)
TL;DR: This is the ¢rst study to report high fertilization and hatch rates from cryopreserved spermatophore using arti¢cial implantation of sperMatophore before spawning.
Journal ArticleDOI
Chilled storage of white shrimp (Litopenaeus vannamei) spermatophores
TL;DR: Developing a protocol for the chilled storage of white shrimp spermatophores and evaluating bacterial propagation during such storage to generate a consistent and reliable supply of spermatozoa for domestication purposes is developed.
References
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Penaeid shrimp broodstock nutrition: an updated review on research and development
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