Reproduction Characteristics of Rice Field Eel (Monopterus albus Zuieuw) on Several Functionally Changed Lands in Banyumas Regency

Priyo Susatyo, Nuning Setyaningrum, Elly Tuti Winarni, Titi Chasanah, Atang Atang

Abstract


Functional change of agricultural lands into non-agricultural lands will
obviously have an impact on the diminished or loss of habitat of the rice
field eels (Monopterus albus Zuieuw). The aim of this research was to
understand the difference of: (1) reproduction parameters (fecundity,
gonadal maturity level (GML), and gonadal maturity index (GMI));
(2) histological features of female and male gonadal development
(oogenesis and spermatogenesis); (3) range of body length in each sexual
 phase; and (4) range of body length in each GML stage of captured eel
from 4 sub-districts of Banyumas regency, Central Java (Ajibarang,
Sumpyuh, Banyumas and Sumbang). The total number of captured
subjects were 631 eels; which consisted of 155; 227; 157; and 92 eels
 from Ajibarang, Sumpyuh, Banyumas, and Sumbang, respectively.
Oogenesis was observed in the stages of GML-1 (chromatin nucleolar
 stages and perinucleolar stage); GML-II (cortical alveolar formation
stage or yolk globular stage), GML-3 (vitellogenic stage or late yolk globular
 stage), GML-IV (mature or ripe stage), and follicle atretic stage. Male
gonadogenesis and spermatogenesis were observed in the prefunctional
 male or intersex. The range of GMI of captured eels was between
0.023 and 0.686. Eel in GML-I, GML-2, GML-3, and GML-IV had GMI
within the range of 0.023-0.096; 0.096-0.425; 0.427-0.686; and
>0.686, respectively. Stage of GML-IV was achieved in eel’s body length
range of 22.6-34.5 cm in Sumpyuh, 22.6-38.5 cm in Ajibarang, and
26.6-34.5 cm in Banyumas. There was no eel that reached the status
of GML-IV in Sumbang, which had the most residential or functionally
changed lands in its area. Based on these findings, can be concluded
that the condition of rice fields or habitat of eel in functionally changed
 lands may affect eel’s growth and sex maturation. 

Keywords


eels/fish reproduction, gonadogenesis

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