The length-weight relationship of the bigeye scad (Selar crumenophthalmus) captured by purse seiners from FMA 716 of North Sulawesi seawaters on May and August 2022
DOI:
https://doi.org/10.35800/jip.v14i1.66508Keywords:
Bigeye Scad, length-weight relationship, FMA 716, fish conservationAbstract
As a small pelagic fish forming a shoal on coastal seawaters, bigeye scad (Selar crumenophthalmus Bloch 1793), having
an important economic value, is frequently captured in the FMA 716 of North Sulawesi seawaters, notably by small
fishing gears such as purse seines. The intensiveness captures of the fish may affect the sustainability and continuity of the
species. The research aims at analyzing some biological reproduction aspects of bigeye scad based on 400 captured
samples, every 200 tails on May 2022 on Agust 2022, taken at random from the purse seine capture which landed at the
coastal fishing port of Tumumpa, Manado. Data are analyzed referring to some common formulas, such as the M/F ratio,
W-L relationship (W = aLb, W = weight, g), L = length (cmFL), a and b constants, condition factor (K), length at first
capture (Lc50%). The length at first maturity (Lm50%) refers to Chodrijah and Faizah (2018), i.e., 18.91 cmFL for males
and 17.98 cmFL for females as references. The value of Lm50% was compared with that of Lc50% for determining their
worthiness. In general, there were 400 fish samples of both fishing seasons with a total weight of 64,554 g, where
the length and weight were 21.56 ± 0.12 cm and 161.39 ± 3.53 g on average, respectively, following the relation W =
0.0827 L3.5185 (r = 0.90; R = 81.0%). Of 400 samples, there were 176 males (44% of the total samples) with a weight of
25,234 g (39.1% of total weight), where its length and weight ranged 20.93 ± 0.15 cm and 143.38 ± 3.81 g in average
respectively, following the relation W = 0.1486 L 3.0725 (r = 0.86; R = 73.3%);. While the rest consisted of 224 females
(56% of total samples) with the weight of 39,320 g (60.9% of total weight), where the length and weight ranged from 22.05
± 0.15 cm and 175.54 ± 4.80 g in average respectively, following the relation W = 0.0626 L 3.7273 (r = 0.89; R = 79.3%).
The sex and weight ratios were 1:1.27 and 1:1.56, respectively. In May, there were 200 samples with a weight of
33,439 g (51.8% of total weight) consisting of 96 males (48%) and 104 females (52%), with the weight of 42.4% and
57.6% respectively. For 96 males, the length and weight of males ranged from 20.94 ± 0.22 cm to 147.79 ± 5.52 g in
average respectively, following the relation W = 0.1495 L 3.0770 (r = 0.86; R = 74.6%); while for 104 females, the length
and weight of females ranged 22.25 ± 0.21 cm and 185.11 ± 6.89 g in average respectively, following the relation W =
0.0567 L 3.8076 (r = 0.90; R = 80.3%). The sex and weight ratios were 1:1.08 and 1:1.36, respectively. Without regard to
gender, the length and weight ranged 21.62 ± 0.17 cm and 167.20 ± 5.15 g on average, following the
relation W = 0.0865 L 3.4926 (r = 0.91; R = 82.4%). In August, there were 200 samples with a weight of 31,115 g
(48.2% of total weight) consisting of 80 males (40%) and 120 females (60%), with the weights of 35.5% and 64.5%
respectively. For 80 males, the length and weight ranged 20.91 ± 0.20 cm and 138.08 ± 4.93 g in average respectively,
following the relation W = 0.1519 L 3.0455 (r = 0.88; R = 76.9%); while for 104 females, the length and weight ranged
21.88 ± 0.20 cm and 167.24 ± 6.34 g in average respectively, following the relation W = 0.0791 L3.5471 (r = 0.88; R =
78.0%). The sex and weight ratios were 1:1.50 and 1:1.82, respectively. Without regard to gender, the length and weight
ranged 21.49 ± 0.16 cm and 155.58 ± 4.71 g in average respectively, following the relation W = 0.0838 L 3.5010 (r =
0.90; R = 81.2%). By using Lm50% reference 18.91 cm and Lc 18.33 cm, it was found that 69.0% of 200 fish samples is
classified as the bigeye scad species, which are still worthy captures, with K ranges 1.82 - 2.73 (2.26 ± 0.02). Using Lm
reference 18.91 cm and Lc 19.12 cm, it found that 70.0% of 200 fish sampels is classified that the bigeye scad species
are appropriate to catch. In this case, it means that the bigeye scad captured at two different fishing seasons from the FMA
716 of the North Sulawesi seawaters are still within a worthy size range to catch. The use of the given mesh size range of the
webbing is highly effective in catching these fish.
Keywords: bigeye scad, length-weight relationship, FMA 716, fish conservation
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