A Descriptive Systematic Study of the Otoliths of the Neopterygean Marine Fishes of South Africa

Hecht, T.; Hecht, Anne

doi:10.1080/00359197909520081

Cited by 16 publications

(11 citation statements)

References 1 publication

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“…The sagittae of Trematornus newnesi were small and generally square in shape (Fig. 8), with a rounded rostrum (nomenclature from Hecht 1978, Morrow 1979. The rostrum was more pronounced in larger fish.…”

Section: Larvalmentioning

confidence: 99%

“…Otoliths were segregated according to their lateral position in the cranium. Left and right sagittae from all fish were scanned using a computeraided video digitizer, which produced a measure of maximum length (from the rostrum to antirostrum, nomenclature of Hecht 1978) and width (the widest distance in the dorsal-ventral plane). Otoliths were weighed on a microbalance to the nearest 0.001 mg.…”

Section: Methodsmentioning

confidence: 99%

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Antarctic fish growth: profile of Trematomus newnesi

Radtke¹,

Targett²,

Kellermann³

et al. 1989

Mar. Ecol. Prog. Ser.

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Life history stages of the Antarctic Peninsula population of the notothenioid Trernaton~us newnesi were examined to gain insights into life history patterns and to understand population processes of ecologically important polar fishes. Sampling yielded 156 larvae and post-larvae and 236 juveniles and adults. Otoliths from these samples were examined for size, morphology and microstructure. External and internal examination of otoliths from 7. newnesi by scanning electron microscopy (SEM) revealed species-specific external shape, and internal rhythmlc patterns. No annual increments could b e identified in T newnesl otol~ths, but apparent daily increments and hatching marks were present. Tetracycline marlung of live f~s h indicated that increments were formed daily, despite extreme variation in photoperiod. Hatchlng season was estimated by back calculation of otolith increments to be from September to November, with recruitment to adulthood dt age 1 yr. Growth data conformed well to the Gompertz growth equation for juveniles and to the von B~rtalanffy equation for adults. F~s h grew slowly with the largest fish attaining 7 yr A multivariate mathematical model, relating age to otolith morphometrics and fish size, demonstrated that agc could be reliably determined from body and otolith measurements. This correlation makes it possible to age much larger samples of fish. The life-history profile of T newnesi may be typical of many polar fishes. Otolith methodology appears relevant for obtaining ages for large samples and for studying life history and population dynamics of polar fishes.

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Section: Larvalmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Antarctic fish growth: profile of Trematomus newnesi

Radtke¹,

Targett²,

Kellermann³

et al. 1989

Mar. Ecol. Prog. Ser.

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“…The samples retrieved were washed through nested sieves to recover cephalopod beaks, fish otoliths, and tissue for identification of prey species consumed (Lowry 1986). Otoliths were identified to the level of genus or species through comparison to published material (Fitch and Brownell 1968, Fitch 1969, Hetch and Hetch 1981, Harkonen 1986 and to reference collections from locally caught fish and museum specimens. Squid beaks were identified using drawings and stereoscopic photos (Clarke 1962(Clarke , 1986Garcia-Tello 1965;Wolff 1982) in addition to reference beaks from museum specimens.…”

Section: Study Site and Animalsmentioning

confidence: 99%

A Protracted Foraging and Attendance Cycle in Female Juan Fernández Fur Seals

Francis

Boness

Ochoa‐Acuña

1998

Marine Mammal Science

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Previous studies of fur seals suggest that the attendance patterns and consequent temporal patterning of energy transfer from mother to pup follows a latitudinal cline. While data from subpolar, tropical, and some temperate latitude species support the postulated cline, data for the temperate latitude Juan Fernández fur seal do not. Maternal foraging trips and associated visits ashore were the longest of all otariids studied to date. The first foraging trip postpartum averaged 10.2 d (n= 51 females, range 1–22.5), foraging trips combined averaged 12.3 d (n= 100, range 1.0‐25.0), and visits ashore averaged 5.3 d (n= 91, range 0.3‐15.8) over the three seasons of study. Only duration of lactation was intermediate between subpolar and tropical strategies as predicted. Dive records suggest that these females feed almost exclusively at night at depths of less than 10 m and at distances of more than 500 km offshore. The prey species of this fur seal, primarily myctophids and squid, migrate to the surface at night and are patchily distributed. Foraging trip length varied between years in conjunction with shifts in seasurface temperature and type of prey consumed. We suggest that distribution of prey, irrespective of latitude, dictates foraging patterns of fur seals and leads to the exceptionally long foraging trips and visits ashore observed in this species.

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“…Identification of otoliths was made by direct comparison with a reference collection held at the Port Elizabeth Museum and from the literature (Karrer, 1973;Schwanhans, 1978;Hecht & Hecht, 1981;North, Burchett, Gilbert & White, 1984). Additional otolith reference specimens and unpublished biometric data for the fishes were made available by T. Hecht (Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa) and T. B. Linkowski (Sea Fisheries Institute, Gdynia, Poland).…”

Section: Analysis Offish Remainsmentioning

confidence: 99%

Seasonal variation in the diet of the king penguin (Aptenodytes patagonicus) at sub‐Antarctic Marion Island

1987

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With 10 figures in the text) The diet of the king penguin Aprenodyres patagoninrs at Marion Island was examined throughout the year by analysis of stomach samples. Fish accounted for 87 % by wet mass, 75 % by numbers and 69 % by reconstituted mass. Their proportional importance by wet mass increased from 68 % during winter to almost 100 % in summer and probably reflects a real increase in their local availability. Squid comprised most of the remainder with crustaceans forming less than 1 % of the diet by numbers. Prey items were generally small, the most abundant being three species of myctophid fish, Krefftichthys anderssoni, Protomycrophum tenisoni and Elecrrona carlsbergi, and a squid Kondakovia longimana. King penguins took both juvenile and adult Krefftichthys anderssoni and P. tenisoni, but only adult E. carlsbergi.

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A Descriptive Systematic Study of the Otoliths of the Neopterygean Marine Fishes of South Africa

Cited by 16 publications

References 1 publication

Antarctic fish growth: profile of Trematomus newnesi

Antarctic fish growth: profile of Trematomus newnesi

A Protracted Foraging and Attendance Cycle in Female Juan Fernández Fur Seals

Seasonal variation in the diet of the king penguin (Aptenodytes patagonicus) at sub‐Antarctic Marion Island

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