Age and growth of the scalloped hammerhead shark, Sphyrna lewini, in the north-west Atlantic Ocean and Gulf of Mexico

2007 ◽  
Vol 58 (1) ◽  
pp. 34 ◽  
Author(s):  
Andrew N. Piercy ◽  
John K. Carlson ◽  
James A. Sulikowski ◽  
George H. Burgess
Keyword(s):  
Atlantic Ocean ◽  
Gulf Of Mexico ◽  
Growth Parameters ◽  
Fork Length ◽  
Age And Growth ◽  
North West ◽  
Scalloped Hammerhead ◽  
The North ◽  
The Usa ◽  
Cent Error

The scalloped hammerhead, Sphryna lewini (Griffith & Smith, 1834), is a globally exploited species of shark. In order to gain insight into the life history of this species in the USA waters, age and growth was examined from specimens (n = 307) captured from the north-west Atlantic Ocean and from the Gulf of Mexico. The von Bertalanffy growth model resulted in growth parameters of L∞ = 214.8 cm fork length (FL), k = 0.13 year–1, t0 = –1.62 year for males and L∞ = 233.1 cm FL, k = 0.09 year–1, t0 = –2.22 year for females. The oldest age estimates obtained for this population were 30.5 years for both males and females, which corresponded to FL of 234 cm and 241 cm respectively. Bowker’s test of symmetry and Index of Average Per Cent Error suggests that our ageing method represents a non-biased and precise approach to the age assessment. Marginal increments were significantly different between months (Kruskal–Wallis P = 0.017) with a distinct trend of increasing monthly increment growth beginning in January. When compared to previously published studies, our growth estimates suggest slower growth than populations in the Pacific Ocean but faster growth than previously reported in the Gulf of Mexico.

scholarly journals An Indo-Pacific damselfish (Neopomacentrus cyanomos) in the Gulf of Mexico: origin and mode of introduction

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4328 ◽  
Author(s):  
D. Ross Robertson ◽  
Omar Dominguez-Dominguez ◽  
Benjamin Victor ◽  
Nuno Simoes
Keyword(s):  
Gulf Of Mexico ◽  
Reef Fishes ◽  
Genetic Characteristics ◽  
West Pacific ◽  
North West ◽  
West Pacific Ocean ◽  
The North ◽  
The Usa ◽  
Tropical Reef ◽  
In Trans

The Indo-West Pacific (IWP) coral-reef damselfish Neopomacentrus cyanomos is well established across the south-west Gulf of Mexico (SwGoMx). Comparisons of mtDNA sequences of the SwGoMx population with those from conspecifics from 16 sites scattered across its native geographic range show that the SwGoMx population is derived from two of four native lineages: one from the north-west Pacific Ocean, the other from the northern Indian Ocean. Three hypotheses address how this species was introduced to the SwGoMX: (1) aquarium release; (2) borne by cargo-ship; and (3) carried by offshore petroleum platform (petro-platform). The first is unlikely because this species rarely features in the aquarium trade, and “N. cyanomos” traded to the USA from the sole IWP source we are aware of are a misidentified congener, N. taeniurus. The second hypothesis is unlikely because shipping has not been associated with the introduction of alien damselfishes, there is little international shipping between the IWP and the SwGoMx, and voyages between those areas would be lengthy and along environmentally unfavorable routes. Various lines of evidence support the third hypothesis: (i) bio-fouled petro-platforms represent artificial reefs that can sustain large and diverse populations of tropical reef-fishes, including N. cyanomos in the SwGoMx; (ii) relocation of such platforms has been implicated in trans-oceanic introductions leading to establishment of non-native populations of such fishes; and (iii) genetic characteristics of the SwGoMx population indicate that it was established by a large and diverse group of founders drawn from the IWP regions where many petro-platforms currently in the SwGoMx and other Atlantic offshore oilfields originated.

scholarly journals An Indo-Pacific damselfish in the Gulf of Mexico: origin and mode of introduction

2017 ◽  
Author(s):  
D Ross Robertson ◽  
Omar Dominguez-Dominguez ◽  
Benjamin Victor ◽  
Nuno Simoes
Keyword(s):  
Gulf Of Mexico ◽  
Reef Fishes ◽  
Genetic Characteristics ◽  
West Pacific ◽  
North West ◽  
West Pacific Ocean ◽  
The North ◽  
The Usa ◽  
Tropical Reef ◽  
In Trans

The Indo-west Pacific (IWP) coral-reef damselfish Neopomacentrus cyanomos is well established across the southwest Gulf of Mexico (SwGoMx). Comparisons of mtDNA sequences of the SwGoMx population with those from conspecifics from 16 sites scattered across its native range show that the SwGoMx population is derived from two of four native lineages: one from the north-west Pacific Ocean, the other from the northern Indian Ocean. Three hypotheses address how this species was introduced to the SwGoMX: (1) aquarium release; (2) borne by cargo-ship; and (3) carried by offshore petroleum platform (petro-platform). The first is unlikely because this species rarely features in the aquarium trade, and “N. cyanomos” traded to the USA from the sole IWP source we are aware of are a misidentified congener, N. taeniurus. The second hypothesis is unlikely because shipping has not been associated with the introduction of alien damselfishes, there is little international shipping between the IWP and the SwGoMx, and voyages between those areas would be lengthy and along environmentally unfavorable routes. Various lines of evidence support the third hypothesis: (i) bio-fouled petro-platforms represent artificial reefs that can sustain large and diverse populations of tropical reef-fishes, including N. cyanomos in the SwGoMx; (ii) relocation of such platforms has been implicated in trans-ocean introductions leading to establishment of non-native populations of such fishes; and (iii) genetic characteristics of the SwGoMx population indicate that it was established by a large and diverse group of founders drawn from the regions where many SwGoMx petro-platforms originated.

scholarly journals An Indo-Pacific damselfish in the Gulf of Mexico: origin and mode of introduction

2017 ◽  
Author(s):  
D Ross Robertson ◽  
Omar Dominguez-Dominguez ◽  
Benjamin Victor ◽  
Nuno Simoes
Keyword(s):  
Gulf Of Mexico ◽  
Reef Fishes ◽  
Genetic Characteristics ◽  
West Pacific ◽  
North West ◽  
West Pacific Ocean ◽  
The North ◽  
The Usa ◽  
Tropical Reef ◽  
In Trans

The Indo-west Pacific (IWP) coral-reef damselfish Neopomacentrus cyanomos is well established across the southwest Gulf of Mexico (SwGoMx). Comparisons of mtDNA sequences of the SwGoMx population with those from conspecifics from 16 sites scattered across its native range show that the SwGoMx population is derived from two of four native lineages: one from the north-west Pacific Ocean, the other from the northern Indian Ocean. Three hypotheses address how this species was introduced to the SwGoMX: (1) aquarium release; (2) borne by cargo-ship; and (3) carried by offshore petroleum platform (petro-platform). The first is unlikely because this species rarely features in the aquarium trade, and “N. cyanomos” traded to the USA from the sole IWP source we are aware of are a misidentified congener, N. taeniurus. The second hypothesis is unlikely because shipping has not been associated with the introduction of alien damselfishes, there is little international shipping between the IWP and the SwGoMx, and voyages between those areas would be lengthy and along environmentally unfavorable routes. Various lines of evidence support the third hypothesis: (i) bio-fouled petro-platforms represent artificial reefs that can sustain large and diverse populations of tropical reef-fishes, including N. cyanomos in the SwGoMx; (ii) relocation of such platforms has been implicated in trans-ocean introductions leading to establishment of non-native populations of such fishes; and (iii) genetic characteristics of the SwGoMx population indicate that it was established by a large and diverse group of founders drawn from the regions where many SwGoMx petro-platforms originated.

Statolith age validation and growth of Loligo plei (Cephalopoda: Loliginidae) in the north-west Gulf of Mexico during spring/summer

2002 ◽  
Vol 82 (4) ◽  
pp. 677-678 ◽  
Author(s):  
G.D. Jackson ◽  
J.W. Forsythe
Keyword(s):  
Gulf Of Mexico ◽  
Rapid Growth ◽  
Growth Analysis ◽  
Late Summer ◽  
Age And Growth ◽  
Age Validation ◽  
North West ◽  
The North ◽  
In Captivity ◽  
Loliginid Squid

Statolith validation and age and growth analysis was undertaken for the loliginid squid Loligo plei in the north-west Gulf of Mexico off Galveston, Texas. Statolith increments were shown to be laid down daily based on tetracycline staining of 19 individuals maintained in captivity. Ageing of field-captured individuals from late summer revealed that this species has rapid growth rates and a life span of about five months at least during the warm period of the year in this region of the Gulf of Mexico.

Biology of peron's threadfin bream, Nemipterus peronii (Valenciennes), from the north west shelf of Australia

1984 ◽  
Vol 35 (2) ◽  
pp. 167 ◽  
Author(s):  
KJ Sainsbury ◽  
AW Whitelaw
Keyword(s):  
Growth Curve ◽  
Sexual Maturity ◽  
Growth Parameters ◽  
Fork Length ◽  
Instantaneous Rate ◽  
Fish Size ◽  
North West ◽  
The North ◽  
Age Range ◽  
Annual Mortality

Samples of N. peronii collected at depths of less than about 100 m showed a slight positive correlation between fish size and depth, but no correlation between abundance and depth and no die1 change in catch rate. Feeding occurred during the day, with crustaceans (Brachyura, Natantia, Mysidacea and Stomatopoda in particular) occurring in 70% of feeding individuals and fish occurring in 17%. Individuals containing ripe eggs were found throughout the year, although the proportion of ripe fish was highest in November and December. Sexual maturity in 50% of females was attained at a fork length of about 15 cm and at an age of 1 year. Zonation on the otoliths was shown to be annual and estimates of the parameters of the von Bertalanfi growth curve were L∞ = 41.9 cm, K= 0.25, t0 = 0.74 years over the age range 0.5-5 years. The growth parameters for sexually differentiated animals differed significantly, but the age-length trajectory of each was very similar over the observed age range. The instantaneous rate of total annual mortality was 1.85 and did not differ between sexes.

scholarly journals Starost, rast i morfometrija otolita palamide (Sarda sarda Block, 1793) iz istočnog Sredozemnog mora

2018 ◽  
Vol 59 (1) ◽  
pp. 97-110 ◽  
Author(s):  
Mado Kotsiri ◽  
Ioannis E. Batjakas
Keyword(s):  
Growth Parameters ◽  
Eastern Mediterranean ◽  
Fork Length ◽  
Cold Season ◽  
Age And Growth ◽  
Fish Length ◽  
Thin Sections ◽  
Significant Relationships ◽  
The One ◽  
Sarda Sarda

The otoliths of the Atlantic bonito, Sarda sarda (Bloch, 1793), were examined with the aim to estimate the age and growth of the species in the eastern Mediterranean Sea and to reveal possible relationships between otolith shape or size and age. All specimens used in this study, ranging from 7.2 to 70.4 cm in fork length and from 20 to 4889 g in total weight, were caught in the Aegean and Ionian Seas during the period 1997-2010. Otolith morphometry was studied using image analysis techniques for all intact sagittae ranging in weight from 0.6 to 11.3 mg and four shape indices were calculated. No statistical significant differences between left and right otolith morphometric variables were found. The age of fish was estimated by counting the pairs of opaque and translucent bands in transversal thin sections of otoliths. The estimated ages ranged from 0+ to 7 years and the von Bertalanffy growth parameters were determined \((L∞=79.9 cm, k=0.261 and to=-1.230 years)\). The examination of the type of growth bands at the outside margin of each otolith per month showed that one translucent band is formed annually during the cold season. The results revealed statistically significant relationships between otolith morphometric variables and fish length or age. Among the variables, otolith weight was the one that showed the highest correlation with age (R=0.77). Therefore, otolith weight could represent a valuable criterion for age estimation in Atlantic bonito that is objective, economic and easy to perform compared to annuli counting method in hard parts.

Age, growth estimates for pink ling, Genypterus blacodes (Schneider), and gemfish, Rexea solandri (Cuvier), from Eastern Bass Strait, Australia

1989 ◽  
Vol 40 (2) ◽  
pp. 215 ◽  
Author(s):  
AF Withell ◽  
JWJ Wankowski
Keyword(s):  
Growth Parameters ◽  
Age And Growth ◽  
Frequency Method ◽  
Slow Growth Rate ◽  
Growth Functions ◽  
Significant Difference ◽  
Marginal Increment ◽  
Males And Females ◽  
Cent Error ◽  
Age Determinations

Age and growth were estimated from counts of otolith annuli for pink ling (Genypterus blacodes) and gemfish (Rexea solandri). Sections of otoliths were preferable for age determinations of pink ling, whereas whole otoliths were preferable for gemfish. Validation of the assigned age classes was not achieved. Petersen's length-frequency method was unsuccessful and marginal increment methods were unsuitable for the species studied. Growth of males and females did not differ significantly for either pink ling or gemfish. Both species had a relatively slow growth rate, had a moderately long life-span and could reach body lengths in excess of 1 m. Maximum ages of pink ling and gemfish were, respectively, 21 and 13 years. Mean length-at-age and the von Bertalanffy growth functions were estimated. For pink ling (all individuals combined), K = 0.095 and L∞ = 135.5 cm. For gemfish the best estimates were K = 0.153 and L∞ = 112.3 cm. Precision of age determinations made independently by two readers for pink ling and gemfish, respectively, was 65% and 95% within �1 annulus; average per cent error, respectively, was 4.7% and 3.1%. Paired t-tests on ages assigned to each species by the two readers indicated no significant difference between ages assigned to gemfish, but there was a significant, albeit unbiased, difference for ages assigned to pink ling. However, for pink ling, estimates of the growth parameters derived separately from age determinations by the two readers were virtually identical.

AGE AND GROWTH OF THE BLUE SHARK PRIONACE GLAUCA IN THE EASTERN ATLANTIC OCEAN

KSTU News ◽  
2021 ◽  
pp. 11-25
Author(s):  
Beraki Weldegiorgish Teklekhaimanot ◽  
Sergey Vadimovich Shibaev ◽  
Sergey Yurievich Gulyugin
Keyword(s):  
Atlantic Ocean ◽  
Growth Parameters ◽  
Growth Function ◽  
Age And Growth ◽  
Growth Band ◽  
Prionace Glauca ◽  
Western Africa ◽  
Eastern Atlantic Ocean ◽  
Digital Microscope ◽  
Central Atlantic

In this study, 292 blue sharks Prionace glauca (Linnaeus, 1758) (from 151 to 305 cm total length, TL) were collected off western Africa in the eastern central Atlantic Ocean between 1980 and 1982. Vertebral sections of females specimens ranged from 175 to 300 cm and males specimens ranged from 166 to 312 cm TL were processed and analyzed for age and growth parameters. Growth band pairs (translucent and opaque bands) were counted on the images photographed from the stained whole vertebrae using digital microscope called Digi Scope II. The band pairs after the birthmark were counted from 3 to 12 for males and from 4 to 13 for females. Growth parameters were derived using the Von Bertalanffy growth function (VBGF) based on FISAT and solver solution Microsoft excel and Ford Wall-Ford. VBGF was that which best fit the data. Parameters derived from the combination of observed and back-calculated lengths, K = 0.1, L_∞ = 386.4 cm and t_0 = −1.35 year for males and K = 0.12 year -1, L_∞= 355 cm and t_0 = –1.02 year for females were considered to best describe growth. The longevity was estimated to be at least 23.7 and 28.3 years for females and males respectively. The natural mortality rate was estimated to be 0.15 year - 1 and 0.18 year -1 for males and females respectively.

Subtidal Rocky Shores of the North-West Atlantic Ocean

2019 ◽  
pp. 90-127
Author(s):  
Ladd E. Johnson ◽  
Kathleen A. MacGregor ◽  
Carla A. Narvaez ◽  
Thew S. Suskiewicz
Keyword(s):  
Atlantic Ocean ◽  
Rocky Shores ◽  
North West ◽  
The North
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