Some morphometric and biochemical features of ready-to-migrate silver and pre-migratory yellow stages of the shortfin eel of south-eastern Australian waters


Autoria(s): De Silva, Sena; Gunasekera, R.; Collins, R.
Data(s)

01/10/2002

Resumo

The mean total length (<i>L</i><sub>T</sub>), mass and age of ready to migrate female silver shortfin eels <i>Anguilla australis</i> from the Hopkins River estuary and the mouth of the Merri River in south-eastern Australia, were 83·2 ± 1·2 cm, 1051 ± 51 g, and 17·2 ± 1·79 years, respectively. The eye index (<i>I</i><sub>E</sub>) of the silver shortfin eels was < 5·2 (mean 7·64 ± 0·29) and differed significantly from that of the yellow shortfin eels collected from two other sites. The <i>I</i><sub>E</sub> increased with <i>L</i><sub>T</sub> (mm) and was related by log <i>I</i><sub>E</sub>= 2·656 log <i>L</i><sub>T</sub>6·925. The per cent moisture, protein and ash content of the liver of silver shortfin eels was significantly lower than in yellow shortfin eels, but lipid content was significantly higher in the former (35·5 ± 2·0%). The mean mass μg mg lipid ‾) of saturates (230·4 ± 2·6 v. 181·7 ±2·6), monoenes (367·4 ± 6·3 v. 290·8 ± 8·9) and PUFA (177·3 ± 5·3 v. 159·7 ± 4·6) in muscle was significantly higher, and the great majority of individual fatty acids was found also in higher quantities in silver shortfin eels. In the liver, the PUFA found in the highest quantity was 22:6n-3, except in shortfin eels from Hopkins River estuary, and the amount of 18:2n-6 in the liver of silver shortfin eels was significantly higher than that in yellow shortfin eels but the reverse was true of 20:4n-6. In both muscle and liver tissues the saturate 16:0 and the monoene 18:ln-9 collectively accounted for >50% of all the fatty acids in the lipid.<br />

Identificador

http://hdl.handle.net/10536/DRO/DU:30001556

Idioma(s)

eng

Publicador

Blackwell Publishing Ltd.

Relação

http://dro.deakin.edu.au/eserv/DU:30001556/n20020416.pdf

http://dx.doi.org/10.1111/j.1095-8649.2002.tb01852.x

Direitos

2002, The Fisheries Society of the British Isles

Palavras-Chave #Silver and yellow eels #Size at migration #Eye index #Proximate composition #Fatty acids
Tipo

Journal Article