Abstract:
The aim of study was to analyze the biological aspects, morphometrics, length-weight
relationships, growth patterns and condition factors, mullet fish (Mugilidae) caught in
Pulau Panjang waters. This research was conducted in May-June 2019. The research
location is Pulau Panjang waters, Sijantung, Galang District, Kota Batam. Fish
samples were obtained by using gill nets with 1.5 inc mesh size, 2.5 meters width,
and 250-meter lengths. Weight length relationship analysis using the Allometric
Linear Model (LAM) to calculate parameters a and b through measurement of changes
in weight and length. The relative weight condition factor (Wr) and Fulton koefisen (K)
are used to evaluate the condition factors of each individual fish sample. There are as
many as 3 types of Belanak fish namely Liza tade (belanak bakau), Liza vaigiensis
(belanak tamok), and Crenimugil crenilabis (belanak putih). The length and weight
range of mullets caught during the study were L.tade with a length range of 17.20-
26.10 cm (an average of 21.9 cm), and a weight of 58.00-187.00 grams (an average
of 111.32 gr). L.vaigiensis ranges in length from 13.80-28.60 cm (21.68 cm), and
weighs 39.00-322.00 grams (an average of 158.00 gr). And C.crenilabis range in
length from 16.50-27.50 (an average of 21.12 cm) and a weight of 51.00-234.00 (an
average of 101.30 gr). The length-weight relationship of L.tade has a regression
equation y = 2.882x -4.222 with a value = 0.0147 (W = 0.0147L3.649). L. vaigiensis
has the equation y = 3.079x -4.568 with a value = 0.0104 (W = 0.0104L3.079).
Whereas C. crenilabis has a regression equation y = 2,703x -3,675 with a value =
0.0253 (W = 0.0253L2.703). L. tade has a negative allometric growth pattern with an
exponent value of 'b' <3 (2,882), and C. crenilabis also has a negative allometric
growth pattern with an exponent value of 'b' <3 of 2,703. Whereas L.vaigiensis has
positive allometric growth with an exponent value of 'b'> 3 (3,079). Based on the
coefficient of determination (R2) all species show that weight gain is influenced by the
increase in fish length. Condition factors indicate good environmental conditions and
a balance between prey and predator
