Early development of New Zealand hapuku Polyprion oxygeneios eggs and larvae.
J Fish Biol
; 80(3): 555-71, 2012 Mar.
Article
in En
| MEDLINE
| ID: mdl-22380553
ABSTRACT
This study describes for the first time the normal development of New Zealand hapuku Polyprion oxygeneios embryos and larvae reared from fertilization to 11 days post-hatch (dph) at a constant temperature. Fertilized eggs were obtained from natural spawnings from communally reared captive wild broodstock. Eggs averaged 2 mm in diameter and had single or multiple oil globules. Embryos developed following the main fish embryological stages and required an average of 1859·50 degree hours post-fertilization (dhpf) to hatch. The newly hatched larvae (4·86 mm mean total length, L(T) ) were undifferentiated, with unpigmented eyes, a single and simple alimentary tube and a finfold that covered the entire body. Larvae relied on the energy from the yolk-sac reserves until 11 dph (7·33 mm mean L(T) ), when yolk-sac reabsorption was almost completed. Some of the major developmental stages from hatching to yolk-sac reabsorption were eye pigmentation (5 dph), upper jaw formation (7 dph), lower jaw formation (8 dph) and mouth opening (8-9 dph). By 9 dph, the digestive system consisted of pancreas, liver, primordial stomach, anterior and posterior gut; therefore, P. oxygeneios larvae would be capable of feeding on live prey. The developmental, morphological and histological data described constitutes essential baseline information on P. oxygeneios biology and normal development.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ovum
/
Perciformes
Limits:
Animals
Country/Region as subject:
Oceania
Language:
En
Journal:
J Fish Biol
Year:
2012
Document type:
Article
Affiliation country:
New Zealand