SARI, IDHA PURNAMA (2022) ANALISIS STOK IKAN KURISI (Nemipterus japonicus) BERDASARKAN HASIL TANGKAPAN YANG DIDARATKAN DI PPI TAMBAK LOROK SEMARANG (22m82). Undergraduate thesis, Universitas Diponegoro.

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Abstract

ABSTRAK
Idha Purnama Sari. 26010118130072. Analisis Stok Ikan Kurisi (Nemipterus
japonicus) Berdasarkan Hasil Tangkapan yang Didaratkan di PPI Tambak Lorok
Semarang (Suradi Wijaya Saputra dan Niniek Widyorini).
Ikan Kurisi (Nemipterus japonicus) merupakan ikan demersal yang
memiliki nilai ekonomis penting. Permintaan pasar yang tinggi meningkatkan
intensitas penangkapan yang dapat mengganggu keberlanjutan ikan Kurisi. Tujuan
dari penelitian ini untuk mengetahui stok ikan Kurisi berdasarkan struktur ukuran,
LC50%, selektivitas alat tangkap, hubungan panjang bobot, faktor kondisi,
parameter pertumbuhan, pola rekrutmen, laju mortalitas dan tingkat eksploitasi.
Penelitian ini dilakukan pada bulan Mei, Juni dan Agustus 2021 di PPI Tambak
Lorok Semarang. Pengambilan sampel dengan metode sistematik random
sampling. Data primer yang dikumpulkan yaitu data panjang (mmTL) dan bobot
(gram). Analisis data menggunakan software FiSAT II. Hasil penelitian
didapatkan ukuran panjang total ikan Kurisi berkisar 74-170 mm dari total sampel
59 ekor. LC50%
bernilai 100,17 mm dengan selektivitas alat tangkap sebesar 3,94.
Hubungan panjang bobot diperoleh persamaan W=0,000051L
2,733
yang
menunjukkan pertumbuhan alometrik negatif dan nilai faktor kondisi berkisar
0,91-1,11 artinya bentuk tubuh pipih. Parameter pertumbuhan diperoleh
persamaan Lt = 172,73[1- e (-0,41(t+0,248))] dengan nilai L∞ sebesar 172,73 mm; K sebesar 0,41 dan t0
sebesar -0,248 tahun. Puncak rekrutmen ikan Kurisi pada
bulan Juni sebesar 14,57%. Laju mortalitas diperoleh nilai Z 0,94/tahun; M
0,62/tahun dan F 0,32/tahun. Tingkat eksploitasi sebesar 0,34 menggambarkan
kondisi stok ikan Kurisi under-exploited.
Kata Kunci: Panjang-Bobot, Pertumbuhan, Mortalitas, Eksploitasi

ABSTRACT
Idha Purnama Sari. 26010118130072. Analysis Stock of Threadfin Bream
(Nemipterus japonicus) Based on Catches Landed at Tambak Lorok Fish Landing
Center, Semarang (Suradi Wijaya Saputra dan Niniek Widyorini).
Threadfin Bream (Nemipterus japonicus) is one of the demersal fish that has
important economic value. High market demand can increase the intensity of
fishing, so it can disrupt the sustainability of Threadfin Bream. The purposes of
this study were to know stock of Threadfin Bream based on size structure, L C50%,
gear selectivity, relationship of length-weight, condition factor, growth
parameter, recruitment, mortality rate and level of exploitation. This research
was conducted in May, June and August 2021 at Tambak Lorok Fish Landing
Center, Semarang. Sampling with systematic random sampling method. The
primary data collected were length (mmTL) and weight (grams). Data analysis
has been used FiSAT II software. The result showed that there was a total length
of Threadfin Bream ranging from 74-170 mm from a total sample of 59 fish. LC50%
was 100,17 mm with gear selectivity was 3,94. The relationship of length-weight
is obtained by the equation W=0,000051L 2,733
which growth pattern was negative
allometric and condition factor ranged 0,91-1,11 which means that the body
shape is flat. Growth parameter was showed the equation Lt = 172,73[1- e(-0,41(t+0,248))
] with a L∞ was 172,73 mm; K was 0,41 and t0
was -0,248 year. The
first peak of Threadfin Bream recruitment was in October at 14.51% and second
in July at 11.18%. Mortality rate showed Z 0,94/year; M 0,62/year and F0,32/year. The level of exploitation was 0,34, it describes stock condition of
Threadfin Bream was under-exploited.
Keywords: Length-Weight, Growth, Mortality, Exploitation

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