MANIPULASI FOTOPERIOD UNTUK MEMACU PERKEMBANGAN GONAD IKAN SELAIS (Ompok hypopthalmus)
ABSTRACT: This researct was
conducted on September 2015 to April 2016. Fish reproduction is controlled by
endocrine system that is affected by external factors such as photoperiod.
Changing in photoperiod may affect the gonad development in fish. To understand
the effect of different photoperiod in gonad development of O. hypopthalmus,
the fishes were reared in fiber tanks (140 x 60 x 40 cm) with water circulation
system and completed with aerator. The treatments applied were : natural
photoperiod, 24D (continuous dark), 16D8L (16 hours dark and 8 hours light),
12D12L (12 hours dark and 12 hours light), 8D16L (8 hours dark and 16 hours
light) and 24L (25 continuous light), and the fish were feed on shrimp and
cricket enriched commercial pellet. The fishes were sampled once/month, 4
fishes/sample. Parameters investigated were body length, body weight, gonad
development, hepatosomatic index (HSI), viscerosomatic index (VSI) and gonadosomatic
index (GSI). Based on the research
results different photoperiod did not affect the gonad development of O.
hypopthalmus. There was no special pattern in gonad development in all
treatments. The gonads were first developed in 13 – 37 weeks old male and
female fishes. The female gonad, however, developed earlier than that of the
male. The smallest female with developed gonad was 10.65 cm TL and 5.55 g BW.
While that of the male was 16.7 cm TL and 16.7 g BW. During the research there
was no mature fish. The HSI and VSI
shown similar patterns, it was increased by the second month (17 weeks old
fish) and then decreased. This decrement indicates that the energy stored has
been used for gonad development. Based on data obtained it can be concluded
that the photoperiod does not affect the gonad development of ompok
hyopthalmus.
Keywords: Photoperiod, gonadal
development, Ompok hypopthalmus
Penulis: Mira Rahmita Sari,
Windarti, Sukendi
Kode Jurnal: jpperikanandd170139
