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Reproductive investment in the Silurus meridionalis
Author(s) -
Xie X.,
Long T.,
Zhang Y.,
Cao Z.
Publication year - 1998
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1998.tb00979.x
Subject(s) - biology , energy metabolism , energy budget , zoology , reproduction , feces , energy requirement , excretion , endocrinology , ecology , psychology , regression , psychoanalysis
A comparison of pre‐ and postspawning Silurus meridionalis showed that 20·7% of body stored energy was utilized during spawning for a standard male (74·5 cm) and 23·8% for a standard female (85·3 cm). About one‐third of the loss of the stored energy was released as eggs by females, and almost all of the energy loss for males and about two‐thirds for females were expended in metabolism. Stored lipid as fuel for metabolism supplied 90·0% of energy in males and 95·2% in females, and protein supplied the rest of the energy. Models for predicting energy in released gametes ( G g ), deposited in the body as somatic growth ( G s ), utilized in spawning activity ( S a ), expended in maintenance ( M , including metabolism, faeces and excretion), and food energy ( C ) were developed, and annual energy budgets were compiled. The balanced budget for a male aged 4 was: 100 C =0·06 G g +11·17 S a +19·5 G s +69·2 M , and for a female aged 5: 100 C =5·48 G g +8·51 S a +15·8 G s +70·2 M .