INASTASIA, AIMANDA (2023) ANALISIS STOK IKAN TIGAWAJA (Johnius sp.) YANG DIDARATKAN DI PANGKALAN PENDARATAN IKAN (PPI) TAMBAK LOROK KOTA SEMARANG (23dsa36). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Inastasia Aimanda. 26010117140037. Analisis Stok Ikan Tigawaja yang
didaratkan di Pangkalan Pendaratan Ikan (PPI) Tambak Lorok Semarang. Anhar
Solichin dan Suradi Wijaya Saputra).
Kondisi perairan di Teluk Semarang mendapatkan tekanan dari berbagai
kegiatan, baik kegiatan pantai ataupun kegiatan di daratan. Faktor yang menyebabkan
penurunan populasi ikan diduga terjadinya eksploitasi ikan secara berlebihan dan
mortalitas alami karena pencemaran. Pengelolaan sumber daya ikan Tigawaja perlu
dilaksanakan dengan terlebih dahulu melakukan kajian potensi lestari sumber daya
ikan, agar diketahui tingkat pemanfaatan sumber daya ikan Tigawaja. Tujuan dari
penelitian ini adalah untuk mengetahui struktur ukuran, hubungan panjang-berat,
ukuran pertama kali tertangkap (Lc50%), pola rekrutmen, parameter pertumbuhan (L∞,
K, t0), mortalitas total (Z), mortalitas alami (M), mortalitas penangkapan (F), dan
tingkat pemanfaatan (E). Metode penelitian yang digunakan adalah metode survei.
Penelitian ini dilaksanakan pada tanggal 27 April 2021 – 15 Juni 2021. Metode
sampling yang digunakan adalah sistematik random sampling. Lokasi pengambilan
sampel di PPI Tambak Lorok Semarang Utara. Pengambilan sampel dilakukan secara
berkala sebulan sekali, selama 3 (tiga) bulan. Sampel ikan diambil dari hasil
tangkapan kapal sampel sekitar 10% secara acak. Pengukuran data panjang dan bobot
dilakukan di Laboratorium Hidrobiologi Gedung D FPIK UNDIP Semarang. Hasil
penelitian menunjukkan bahwa panjang ikan Tigawaja berkisar 50-264 mmTL, nilai
Lc50% sebesar 86,5 mmTL, puncak rekrutmen terjadi di bulan September. Hubungan
panjang-berat mengikuti persamaan W = 0,00005 L
2,7
, dan pola pertumbuhan bersifat
allometrik negatif. Persamaan pertumbuhan von Bertalanffy ikan Tigawaja adalah Lt
= 253,58 [1-e
(-1,1(t+0,052)
]. Mortalitas total (Z) 1,69/tahun; mortalitas alami (M)
1,08/tahun; mortalitas penangkapan (F) 0,61/tahun. Tingkat pemanfaatan (E) sebesar
0,36 yang berarti status tingkat pemanfaatan ikan Tigawaja tergolong belum
optimum.
Kata Kunci : Johnius sp, Mortalitas, Pertumbuhan, Tambak Lorok.

ABSTRACT
(Inastasia Aimanda, 26010117140037. Analysis of Tigawaja Fish Stocks
landed at the Tambak Lorok Fish Landing Base (PPI) Semarang. Anhar Solichin
and Suradi Wijaya Saputra).
The condition of the waters in Semarang Bay is under pressure from various
activities, both beach activities and land activities. The factor that causes the decline
in fish populations is overexploitation of fish. The management of Tigawaja fish
resources needs to be carried out by first conducting a study of the sustainable
potential of fish resources, so that the level of utilization of Tigawaja's fish resources
is known. The purpose of this study was to determine size structure, length-weight
relationship, size at first caught (Lc50%), recruitment pattern, growth parameters
(L∞, K, t0), total mortality (Z), natural mortality (M), fishing mortality (F), and
utilization rate (E). The research method used is a survey method. This research was
conducted on 27 April 2021 – 15 June 2021. The sampling location was at PPP
Tambak Lorok, North Semarang. Measurement of length and weight data was carried
out at the Hydrobiology Laboratory, Building D, FPIK UNDIP Semarang. The
sampling method used is systematic random sampling. Sampling is done periodically
once a month, for 3 (three) months. Fish samples were taken from the catch of the
ship sampled as much as 10% at random. The results showed that the length of
Tigawaja fish ranged from 50-264 mmTL, the Lc50% value was 86.5 mmTL, the peak
of recruitment occurred in September. The length-weight relationship followed the
equation W = 0.000005 L2.7, and the growth pattern was negative allometric. The
von Bertalanffy growth equation of Tigawaja fish was Lt = 253.58 [1-e(-
1,1(t+0.052)], total mortality (Z) 1.69/year, natural mortality (M) 1.08/year; fishing
mortality (F) 0.61/year The utilization rate (E) is 0.36, which means that the status of
the utilization level of Tigawaja fish is not yet optimum.
Keywords : Johnius sp, Growth, Mortality, Tambak Lorok.

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