Observations on the decline in sperm quality of Penaeus setiferus under laboratory conditions

Leung‐Trujillo, Joanna R.; Lawrence, Addison L.

doi:10.1016/0044-8486(87)90249-3

Cited by 111 publications

(70 citation statements)

References 11 publications

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“…Indeed, most of these studies reported that, over extended time periods, spermatophores did not show deterioration (Leung-Trujillo and Lawrence, 1991;Alfaro, 1993;Alfaro and Lozano, 1993;Heitzmann and Diter, 1993;Pratoomchat et al, 1993;Alfaro, 1996;Pascual et al, 1998;Diaz et al, 2001;Ceballos-Vazquez et al, 2004). If the spermatophores are not evacuated (manually, electrically or through mating), they may become melanized in some individuals even within few days (as in Fig.·2) and subsequently hardened enough to prevent their ejaculation (Leung-Trujillo and Lawrence, 1987;Talbot et al, 1989;Perez-Velazquez et al, 2001). All these studies thus suggest that penaeid male readiness for the next copulation might actually be increased through the previous copulation.…”

Section: Discussionmentioning

confidence: 99%

“…Cyclical spermatophore disposal in shrimp in shrimp males, another reproduction-related phenomenon, spermatophore melanization, is well documented in these animals. In captive penaeid shrimps, such as L. vannamei, the brown pigment, melanin, accumulates in the spermatophores, and males with heavily melanized spermatophores are sexually impotent, since they cannot ejaculate (Leung-Trujillo and Lawrence, 1987;Talbot et al, 1989;Wyban and Sweeney, 1991;Alfaro and Lozano, 1993;PerezVelazquez et al, 2001). Melanin specks may appear in the ampoule of sub-adult males even before the appearance of a spermatophore (Parnes et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Males also have their time of the month! Cyclic disposal of old spermatophores, timed by the molt cycle, in a marine shrimp

Parnes

Raviv

Shechter

et al. 2006

Journal of Experimental Biology

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SUMMARY That sexually mature females go through hormonally regulated reproductive cycles is a well-established phenomenon in sexually reproducing organisms. Males, on the other hand, are commonly regarded as being continuously ready to mate. `Programmed sperm degradation' on a periodic basis or an innate sperm`expiry date' have never been shown. This manuscript describes a newly discovered molt-dependent mechanism by which old sperm is periodically removed from the reproductive system of male Litopenaeus vannamei shrimp. Firstly, it is shown that the spermatophores of males held in captivity become progressively melanized, a process that eventually renders them impotent. Then, by using melanin specks as a color marker, it is demonstrated that this phenomenon can be delayed and even reversed as long as the males remain sexually active. Lastly and most importantly, it is shown that male shrimp go through reproductive cycles that are strictly associated with their molt cycles, which, in turn, are hormonally regulated. Intact intermolt spermatophores disappeared about 12 h premolt, and a new pair of spermatophores appeared in the ampoules the day after the males had molted. This phenomenon was observed in an almost constant portion of males, both those in an all-male population and those in mixed male/female populations,even during the times that the females of those populations were not vitellogenically active. To the best of our knowledge, 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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Males also have their time of the month! Cyclic disposal of old spermatophores, timed by the molt cycle, in a marine shrimp

Parnes

Raviv

Shechter

et al. 2006

Journal of Experimental Biology

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“…Os espermatóforos extraídos, tanto no início (dia zero) como no final (dia 43) do experimento, foram pesados e os espermatozóides contados no microscópio Ciência Rural, v.38, n.7, out, 2008. óptico com o auxílio de um hemacitômetro (câmara de Neubauer), de acordo com o método proposto por LEUNG- TRUJILLO & LAWRENCE (1987b).…”

Section: Experimento De Extrusão Do Espermatóforounclassified

“…O tempo de regeneração do espermatóforo pode variar conforme a espécie, com valores médios de quatro, seis e sete dias, respectivamente para L. vannamei, L. stylirostris e P. setiferus (LEUNG-TRUJILLO & LAWRENCE, 1987b). GIANGIOBBE et al (1996) realizaram a extrusão do espermatóforo manual e eletricamente em F. paulensis e verificaram que o tempo de regeneração foi em média de 11 dias com uso de estímulo elétrico e nove dias com extrusão manual.…”

Section: Dia Da Extrusãounclassified

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Métodos de extrusão manual e elétrica dos espermatóforos de reprodutores selvagens do camarão-rosa Farfantepenaeus paulensis (Decapoda: Penaeidae)

et al. 2008

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O presente estudo comparou os métodos manual e elétrico de extrusão do espermatóforo do camarão-rosa Farfantepenaeus paulensis com o objetivo de verificar se os métodos de extrusão exercem influência na quantidade de células espermáticas e na regeneração de novos espermatóforos. Os machos foram extrusados no início (dia zero) e no final do experimento (dia 43) para verificação da eficiência dos métodos no processo de regeneração. A extrusão manual foi realizada por meio de pressão na região do quinto par de pereiópodos e o método elétrico com uso de eletrodo para transmissão de impulso elétrico de 9 volts na mesma região. Os dois métodos foram considerados eficientes, não sendo encontradas diferenças significativas entre estes (P>0,05) para o número de células espermáticas. Entretanto, foi verificada, no final do experimento, a perda de peso corporal, peso de espermatóforo e menor índice espermatossomático (IES) (P<0,05) nos animais submetidos a extrusão do espermatóforo por estímulo elétrico. Os valores médios finais (±DP) do número de espermatozóides foram 1,46 (±0,84) e 3,25 milhões (±2,12) para os tratamentos com método elétrico e manual, respectivamente. Os resultados indicam que ambos os métodos podem ser utilizados para a coleta inicial de espermatóforos e testes de qualidade de espermatozóide. Entretanto, para a reutilização dos machos após a extrusão inicial do espermatóforo, o método manual é mais indicado pela manutenção do número de células espermáticas, peso do espermatóforo, peso corporal e índice espermatossomático após a regeneração.

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Cryopreservation of spermatozoa of the edible mud crabScylla serrata (Forskal)

Bhavanishankar

Subramoniam

1997

J. Exp. Zool.

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Observations on the decline in sperm quality of Penaeus setiferus under laboratory conditions

Cited by 111 publications

References 11 publications

Males also have their time of the month! Cyclic disposal of old spermatophores, timed by the molt cycle, in a marine shrimp

Males also have their time of the month! Cyclic disposal of old spermatophores, timed by the molt cycle, in a marine shrimp

Métodos de extrusão manual e elétrica dos espermatóforos de reprodutores selvagens do camarão-rosa Farfantepenaeus paulensis (Decapoda: Penaeidae)

Cryopreservation of spermatozoa of the edible mud crabScylla serrata (Forskal)

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