scholarly journals Larval feeding habits of Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori (Pisces: Myctophidae) in the transition region of the western North Pacific

2005 ◽  
Vol 298 ◽  
pp. 261-276 ◽  
Author(s):  
C Sassa ◽  
K Kawaguchi
Keyword(s):  
Transition Region ◽  
North Pacific ◽  
Western North Pacific ◽  
Feeding Habits ◽  
Larval Feeding ◽  
Diaphus Theta

Feeding ecology of Symbolophorus californiensis larvae (Teleostei: Myctophidae) in the southern transition region of the western North Pacific

2009 ◽  
Vol 90 (6) ◽  
pp. 1249-1256 ◽  
Author(s):  
Chiyuki Sassa
Keyword(s):  
Transition Region ◽  
North Pacific ◽  
Western North Pacific ◽  
Developmental Stages ◽  
Feeding Habits ◽  
Larval Growth ◽  
Trophic Niche ◽  
Size Class ◽  
Gut Contents ◽  
Wide Range

The feeding habits of myctophid larvae of Symbolophorus californiensis were examined in the southern transition region of the western North Pacific where the main spawning and nursery grounds of S. californiensis are formed. This species is a key component of the pelagic ecosystems of this region, and their larvae attain one of the largest sizes among myctophids. To analyse gut contents larvae, including most life history stages after yolk-sac absorption (3.7 to 22.2 mm body length (BL)), were collected in the upper 100 m layer in 1997 and 1998. Feeding incidence was higher during the day than at night (53.1–92.3% versus 0–5.6%), and daytime feeding incidence increased gradually with larval growth. Larvae fed mainly on copepods of various developmental stages. Larvae of S. californiensis showed an ontogenetic change in their diet: larvae ≤7.9 mm BL (i.e. preflexion stage) fed mainly on copepod eggs and nauplii, while the larvae ≥8 mm BL consumed mainly calanoid copepodites such as Pseudocalanus and Paracalanus spp. In the largest size-class (16–22.2 mm BL), the furcilia stage of euphausiids was also an important prey item. There was an increase in the average prey size with growth in larvae ≤11.9 mm BL, while the number of prey eaten positively correlated with growth in larvae ≥12 mm BL. The trophic niche breadth also increased with larval growth, which would ensure a wide range of available food resources for the larger size-class larvae.

Comparison of feeding habits of myctophid fishes and juvenile small epipelagic fishes in the western North Pacific

2009 ◽  
Vol 156 (4) ◽  
pp. 641-659 ◽  
Author(s):  
Kaori Takagi ◽  
Akihiko Yatsu ◽  
Hiroshi Itoh ◽  
Masatoshi Moku ◽  
Hiroshi Nishida
Keyword(s):  
North Pacific ◽  
Western North Pacific ◽  
Feeding Habits

Distribution patterns of larval myctophid fishes in the transition region of the western North Pacific

2004 ◽  
Vol 144 (3) ◽  
pp. 417-428 ◽  
Author(s):  
C. Sassa ◽  
K. Kawaguchi ◽  
Y. Oozeki ◽  
H. Kubota ◽  
H. Sugisaki
Keyword(s):  
Transition Region ◽  
North Pacific ◽  
Western North Pacific ◽  
Distribution Patterns
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