Effect of photoperiod and temperature on testicular regression in Channa punctatus.
J Environ Biol
; 31(3): 307-10, 2010 May.
Article
em En
| MEDLINE
| ID: mdl-21047002
ABSTRACT
In Channa punctatus testicular regression commonly observed during spawning and postspawing phases of reproductive cycle. In the present study testicular regression was frequently noticed in fish maintained under both long photoperiod-warm temperature (LD 16 8-30 degrees C) and short photoperiod-warm temperature (LD 8 16-30 degrees C) regimes. Testicular regression was characterized by distortion of cellular boundary of lobules and formation of collagenous capsules containing degenerating germ cells, blood cells and colloidal mass within the lobules. The magnitude of testicular regression was more in fish exposed to short photoperiod regime (R-73.33%, SP-41.67%) than long photoperiod regime (R-50.83%, SP-19.16%) and control group (R-20.83%, SP-16.67%) in both resting (R) and spawning (SP) phases. Further the frequency of testicular regression during resting phase was 73.33% (short photoperiod), 50.83% (long photoperiod) and 20.83% (control) whereas during spawning phase was 41.67% (short photoperiod) 19.16% (long photoperiod) and 16.67% (control). In the present study occurrence of more testicular regression during resting phase than spawning phase may be due to change in the endogenous condition of the fish.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Temperatura
/
Testículo
/
Perciformes
/
Fotoperíodo
Limite:
Animals
Idioma:
En
Revista:
J Environ Biol
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Índia