Stock structure of the blue threadfin (Eleutheronema tetradactylum) across northern Australia derived from life-history characteristics

Ballagh, Aaron C.; Welch, David J.; Newman, Stephen J.; Allsop, Quentin; Stapley, Jason

doi:10.1016/j.fishres.2012.01.011

Cited by 17 publications

(35 citation statements)

References 39 publications

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“…8 years and grow up to 1000 mm L T . Other reports from Australian waters also confirm the species to be a protandrous hermaphrodite (Russell, ; Ballagh et al ., ). Reports on the species from India, however, indicate that the species is gonochoristic (Patnaik, ; Gopalakrishnan, ), but there are no detailed studies with histological evidence to prove or disprove gonochorism in E. tetradactylum from Indian waters.…”

Section: Introductionmentioning

confidence: 99%

Histological profiling of gonads depicting protandrous hermaphroditism in Eleutheronema tetradactylum

Shihab

Gopalakrishnan

Vineesh

et al. 2017

Journal of Fish Biology

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The fourfinger threadfin Eleutheronema tetradactylum is reported as a protandrous hermaphrodite from Australian waters, while being a gonochorist in reports from Singapore and India, with a single report of protandrous hermaphroditism from the latter. Histological analysis of gonads of fish from Indian waters confirms protandrous hermaphroditism in E. tetradactylum. The study was based on 480 fish examined from eight locations along the Indian coast. Mean total length (L ) of male fish was 240 mm with the transition to female starting from 280 mm L . Specimens confirmed as mature females were >380 mm L .

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Section: Introductionmentioning

confidence: 99%

Histological profiling of gonads depicting protandrous hermaphroditism in Eleutheronema tetradactylum

Shihab

Gopalakrishnan

Vineesh

et al. 2017

Journal of Fish Biology

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“…Frekuensi tertinggi terdapat pada selang kelas 130-134 mm pada jantan sementara 150-154 mm pada betina. Hal ini berbeda pada penelitian Djamali et al, (1988) dengan ikan kurau (Eleutheronema tetradactylum) yang tertangkap di daerah muara Sungai Musi, Sumatera Selatan yang berukuran 113-380 mm dan di daerah perairan Utara Australia yang berukuran 203-815 mm (Ballagh et al, 2011). Menurut Ashida and Masahiro (2015), menjelaskan bahwa jika pada suatu perairan terdapat perbedaan ukuran dan jumlah ikan, hal tersebut mungkin disebabkan oleh perbedaan pola pertumbuhan, perbedaan ukuran pertama kali matang gonad, perbedaan masa hidup, dan adanya pemasukan jenis ikan atau spesies baru pada suatu populasi ikan yang sudah ada.…”

Section: Pembahasanunclassified

STRUKTUR POPULASI IKAN KURAU Polynemus dubius DI TELUK PALABUHANRATU

Hasibuan

Boer

Ernawati

2018

J. Ilmu dan Teknologi Kelautan Tropis

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Teluk Palabuhanratu memiliki banyak sumberdaya ikan, salah satunya adalah ikan kurau Polynemus dubius. Aktivitas penangkapan ikan yang terus-menerus dapat mempengaruhi dinamika populasi ikan kurau. Perubahan dinamika populasi dapat diketahui dengan melihat struktur ukuran dan reproduksi ikan. Tujuan penelitian ini adalah untuk menganalisis status populasi ikan kurau P. dubius di Teluk Palabuhanratu melalui pengkajian aspek reproduksi dan dinamika populasi selama bulan Mei-September 2017. Jumlah ikan kurau diperoleh sebanyak 384 ekor ikan jantan dan 556 ekor ikan betina dengan menggunakan metode Penarikan Contoh Acak Berlapis (PCAB). Analisis data terdiri atas sebaran frekuensi panjang, hubungan panjang bobot, serta rasio kelamin dan tingkat kematangan gonad. Hasil penelitiaan diperoleh bahwa rasio kelamin jantan dan betina adalah 1:1,45 (tidak seimbang), tingkat kematangan gonad IV terjadi pada bulan september sebesar 68% jantan dan 38% betina. Hubungan panjang bobot ikan kurau memiliki pola pertumbuhan isometrik didominasi oleh ikan belum matang gonad. Oleh karena itu, status populasi ikan kurau di Palabuhanratu sudah menunjukan overexploited dengan aspek reproduksi yang menunjukkan kondisi TKG yang tidak ideal, nilai Lc<Lm dan menangkap pada musim pemijahan akan mengganggu keberlanjutan populasi ikan ini sedangkan dari sisi dinamika populasi, pertumbuhan ikan yang seragam menunjukkan potensi pertumbuhan ikan semakin rendah dan perlu kehati-hatian dalam menetapkan target tangkapan.

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“…The E. tetradactylum (Polynemidae: Perciformes) is in fact a protandrous, hermaphrodite marine fish (Patnaik, 1967;Kowtal, 1972;Stanger, 1974;Motomura, 2004;Sadovy & Liu, 2008). They act as functional male in their early part of life and then act as functional female for the later periods of life (Patnaik, 1967;Kowtal, 1972;Stanger, 1974;McPherson, 1997;Ballagh et al, 2012). The body size (fork length) of E. tetradactylum act as an important diagnostic marker for the male and female discrimination among the individuals (Kailola et al, 1993;McPherson, 1997;Ballagh et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The developmental variations of the sagitta otolith in the young and mature male of a hermaphrodite polynemidae fish, Eleutheronema tetradactylum (Shaw, 1804)

Roy¹,

Bardhan

2021

Pap. Avulsos Zool.

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The Eleutheronema tetradactylum is a protandrous, hermaphrodite, marine perciformes fish. The body length of this fish acts as an important diagnostic marker for male and female discrimination. The present study describes for the first time the ultrastructural characteristics on the medial surface of the sagitta otolith in different body size groups of males of E. tetradactylum (Polynemidae: Perciformes) using scanning electron microscopy. The sagitta is a spindle-shaped structure that includes a well-developed rostrum and a poorly developed antirostrum. The sulcus is ostio-pseudocaudal type, almost straight and devoid of the collum. The ostium is a well-developed, vase-shaped structure. The cauda includes the colliculum and a well-developed caudal bulb with several distinct growth stripes. The length of the caudal bulb is significantly correlated to the growth of the body size of the fish. The excisura major is indistinct and the excisura minor is absent. The cristae are distinct on both sides of the sulcus. The one-way ANOVA test revealed that the development of several sagitta features shows significant differences in various body size groups of E. tetradactylum. The growth of the sagitta length is more closely related to the fork length than the sagitta width. Therefore, the sagitta length and the caudal bulb length can be used as important predictors to evaluate the fish size. The cauda region of the sagitta in E. tetradactylum is unique as well as more decorative than those of another Polynemidae fish and other hermaphrodite, marine perciformes fishes. The sagitta characteristics of E. tetradactylum might be advantageous in the identification of the sex and the taxonomy of the hermaphrodite fish species.

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Stock structure of the blue threadfin (Eleutheronema tetradactylum) across northern Australia derived from life-history characteristics

Cited by 17 publications

References 39 publications

Histological profiling of gonads depicting protandrous hermaphroditism in Eleutheronema tetradactylum

Histological profiling of gonads depicting protandrous hermaphroditism in Eleutheronema tetradactylum

STRUKTUR POPULASI IKAN KURAU Polynemus dubius DI TELUK PALABUHANRATU

The developmental variations of the sagitta otolith in the young and mature male of a hermaphrodite polynemidae fish, Eleutheronema tetradactylum (Shaw, 1804)

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