Morphology
provided by Fishbase
Dorsal spines (total): 0; Dorsal soft rays (total): 15 - 17; Analspines: 0; Analsoft rays: 15 - 16
- Recorder
- Cristina V. Garilao
Trophic Strategy
provided by Fishbase
High-oceanic and mesopelagic species (Ref. 4066), found between 501-700 m during the day and between 40-175 m during the night, exhibiting size stratification with depth (Ref. 4479). Probably spawns in deep water during spring (Ref. 4479).
- Recorder
- Grace Tolentino Pablico
Biology
provided by Fishbase
High-oceanic and mesopelagic species (Ref. 4066), found between 501-700 m during the day and between 40-175 m during the night, exhibiting size stratification with depth (Ref. 4479). Probably spawns in deep water during spring (Ref. 4479).
Comprehensive Description
provided by Smithsonian Contributions to Zoology
Diaphus effulgens
This bipolar subtropical species (Backus et al., 1977) is known to exceed 150 mm in length (Nafpaktitis et al., 1977). The largest specimen caught during Ocean Acre was 96 mm. Diaphus effulgens was uncommon in the study area at all seasons. The Ocean Acre collections contain 120 specimens; 51 were caught during the paired seasonal cruises, 36 of these in discrete-depth samples, of which 30 of the latter were in discrete-depth noncrepuscular tows (Table 23).
DEVELOPMENTAL STAGES.—Juveniles were 12–58 mm, subadults 53–63 mm, and adult males 77–90 mm. Adult females were not taken. Juveniles smaller than 50 mm could not be sexed. The eight largest fish (69–96 mm) were males, and the largest female was 63 mm. This apparently is not a reflection of a sexual dimorphism in size, as Nafpaktitis et al. (1977) examined females up to 139 mm.
REPRODUCTIVE CYCLE AND SEASONAL ABUNDANCE.—The reproductive cycle and life span of D. effulgens in the study area is uncertain. Based upon the relatively large size attained, this species probably lives at least two years. The parent population probably breeds in spring and summer, with a peak in late spring. Abundance, although quite low at all times, is at a maximum in late summer (Table 45).
Recruitment of small fish (less than 20 mm) occurred only in August and September, at which time they made up more than 80 percent of the total number taken in both nondiscrete and discrete-depth samples. Adult males were caught only from June to September. The seasonal distributions of small juveniles and adult males suggest that spawning occurs in spring and summer.
In winter and late spring fish larger than 40 mm predominate, and abundance is about half that in late summer (Table 45). In late summer fish smaller than 20 mm dominated the discrete-depth collections. At that season the combined IKMT and Engel trawl catches apparently consisted of at least three year classes: young-of-the-year fish, 12–23 mm (taken only in the IKMT); fish about one-year old, 35–59 mm; and fish two or more years old, 80–92 mm. Fish of the latter two groups, with one exception, were taken with the Engel trawl.
VERTICAL DISTRIBUTION.—Vertical distribution for all seasons combined was by day, 501–700 m; and by night, 90–200 m. By day, fish taken at 501–600 m were 14–33 mm and those at 601–700 m depths were 40–86 mm; at night all but one fish 40 mm and smaller were taken at 90–100 m, with larger fish near or below 150 m. During both day and night juveniles were found throughout the vertical range; the more advanced stages were only at or near the lower depth limit (Table 46).
- bibliographic citation
- Gibbs, Robert H., Jr. and Krueger, William H. 1987. "Biology of midwater fishes of the Bermuda Ocean Acre." Smithsonian Contributions to Zoology. 1-187. https://doi.org/10.5479/si.00810282.452
Headlight fish: Brief Summary
provided by wikipedia EN
The headlight fish (Diaphus effulgens) is a species of lanternfish in the family Myctophidae. It is also sometimes referred to as the headlight lanternfish, or even the lanternfish, though it is not the only species to be called this.
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Distribution
provided by World Register of Marine Species
USA to about 20°N, from Brazil to subtropical convergence
North-West Atlantic Ocean species (NWARMS)
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Habitat
provided by World Register of Marine Species
High-oceanic and mesopelagic species, found between 501-700 m during the day and between 40-175 m during the night, exhibiting size stratification with depth.
North-West Atlantic Ocean species (NWARMS)
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- cc-by-4.0
- copyright
- WoRMS Editorial Board
Habitat
provided by World Register of Marine Species
nektonic
North-West Atlantic Ocean species (NWARMS)
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- cc-by-4.0
- copyright
- WoRMS Editorial Board