Fecundity of Migrating European eel (Anguilla Anguilla) from Polish Waters

Abstract

This study demonstrated that individual fecundity of 34 migrating European female eels Anguilla anguilla increases linearly with body weight (BW) and total length (TL). The total individual fecundity of fish from 560 to 1960 g BW was between 981 x 10 3 and 6320 x 10 3 eggs, respectively. The mean relative individual fecundity equalled 2415 x 10 3 (± 524 x 10 3 ) per kg BW. The values of this parameter ranged from 1753 x 10 3 to 3224.5 x 10 3 kg -1 . Based on the results, it might be suggested that A. anguilla has lower total individual fecundity than New Zealand longfin eel (Anguilla dieffenbachii), American eel (Anguilla rostrata) and Japanese eel (Anguilla japonica) although it has one of the highest fecundity values per kg BW. Total fecundity was strongly depended from fat level in muscle (R 2 = 0.9523) and ovary (R 2 = 0.9531) as well as level of DHA content in ovary (R 2 = 0.8967) and muscle (R 2 = 0.6274) (N=10). There were no important relationship between total fecundity and protein level as well as in muscle and ovary.

Lipid profiles of Mediterranean moray, Muraena helena, European conger, Conger conger, and European eel, Anguilla anguilla (Actinopterygii: Anguilliformes)

“…Variations in total lipid content and the profile of different lipid types are common in cold adaptations among fish and other vertebrates (Palmerini et al 2009, Heffer-Lauc et al 2010, Mazzeo et al 2010, Ghazali et al 2013. Also, lipids tend to accumulate in eel prior to spawning migration (Dębowska et al 2015) but also tend to increase with growth (Degani et al 1986). We could only guess whether any growth phase of moray and conger would follow the same trend as noted in Dębowska et al (2015) and Degani et al (1986) especially in the first years of growth, in this study such correlation was impossible since all animals were adults above 5 up to 7 years of age (Matić-Skoko at al.…”

“…Also, lipids tend to accumulate in eel prior to spawning migration (Dębowska et al 2015) but also tend to increase with growth (Degani et al 1986). We could only guess whether any growth phase of moray and conger would follow the same trend as noted in Dębowska et al (2015) and Degani et al (1986) especially in the first years of growth, in this study such correlation was impossible since all animals were adults above 5 up to 7 years of age (Matić-Skoko at al. 2012.…”

Tropical Eel: Vulnerability Approach untuk Pengelolaan Berkelanjutan

“…Ukuran maksimum yang tertangkap di setiap lokasi berbeda-beda. Tangkapan di stasiun 1 berukuran 10 cm (kelas glass atau larva), pada stasiun 2-5 sidat dengan ukuran yang lebih besar namun masih di bawah ukuran rata-rata matang gonad (>68 cm) untuk ukuran sidat eropa (Parmeggiani et al 2015;Dębowska et al 2016). Anguilla bicolor banyak ditemukan di Samudra Hindia (Kuroki et al 2007) mulai matang gonad pada usia lebih dari 7 tahun dengan status tropik level pada level ke 4.…”

“…Ikan sidat di Sungai Cimandiri memiliki rekruitmen yang rendah, yaitu antara 17,61-25,58% setiap tahunnya. Menurut Dębowska et al (2016), A. anguilla sudah mencapai matang gonad di ukuran 73,6 cm dengan bobot 660 gram. Selain data produktivitas, dalam menentukan tingkat suseptabilitas juga dilakukan analisis seperti tercantum pada Tabel 3 Aktivitas perikanan sidat sebagian besar di lakukan penangkapan pada area sungai, muara, dan pesisir.…”

Use of an ultrasound device to determine sex and to perform gonad biopsy in the European eel Anguilla Anguilla

“…However, the features associated with the reproduction of this species occurred under controlled conditions. It is a species with very high fecundity (DĘBOWSKA et al 2015), so it is possible that after a very precise development of reproductive biotechnology and larviculture, it will be possible to produce the European eel in fish farms, which will allow for additional protection of this species. However, it has been shown when catching fish starting their spawning migration that females infested by Anguillicola crassus are small and may not differ in size from males (CLEVESTAM et al, 2011).…”