Search results | Digital Commons of Moss Landing Marine Laboratories

Title: Age, growth, and reproduction of the Pacific angel shark, (Squatina californica) from Santa Barbara, California (Abstract),
Description: , , ,
Author: Natanson, Cailliet, Welden
Date: 1984-01-01T00:00:00Z

Title: Reproduction and development in the Pacific angel shark, Squatina californica, off Santa Barbara, California,
Description: , , ,
Author: Natanson, Cailliet
Date: 1986-01-01T00:00:00Z

Title: Application of bomb radiocarbon chronologies to shortfin mako (Isurus oxyrinchus) age validation,
Description: Age estimation is an issue for the shortfin mako, Isurus oxyrinchus, because of disagreement on vertebral band-pair deposition periodicity. In the 1950s-1960s, thermonuclear testing released large amounts of radiocarbon into the atmosphere, which diffused into the ocean through gas exchange. This influx created a time-specific marker that can be used in age validation. Annual band-pair deposition in the porbeagle, Lamna nasus, was validated in a previous study and indicated preliminary annual deposition in the shortfin mako, using four samples from one vertebra. In the present study, age estimates from 54 shortfin mako vertebrae collected in 1950-1984 ranged 1-31 years. Ageing error between readers was consistent, with 76% of the estimates ranging within 2 years. Twenty-one Δ14C values from eight shortfin mako vertebrae (collected in the western North Atlantic in 1963-1984) ranged -154.8‰ to 86.8‰. The resulting conformity with the Δ14C timeline for the porbeagle supported annual band-pair deposition in vertebrae of the shortfin mako. © 2006 Springer Science+Business Media, Inc., Cited By (since 1996):19, Fish and Fisheries, CODEN: EBFID, ,
Author: Ardizzone, Cailliet, Natanson, Andrews, Kerr, Brown
Date: 2006-01-01T00:00:00Z

Title: Vertebral growth zone deposition in Pacific angel sharks,
Description: , , ,
Author: Natanson, Cailliet
Date: 1990-01-01T00:00:00Z

Title: Growth and demography of the Pacific angel shark (Squatina californica), based upon tag returns off California,
Description: The authors have accumulated data on 69 tag-recaptures and have used this information to model a von Bertalanffy growth function to predict the growth of this commercially exploited shark species. Demographic analysis of this species yielded a net reproductive rate (Ro) of 2.25, a generation time of 14.5 yr, and an estimate of the instantaneous population growth coefficient (r) of 0.056 yr-1, assuming that only natural mortality was occurring, estimated to be 0.2 yr-1. When reasonable estimates of fishing mortality are included in the survivorship function, Ro and r are reduced considerably. Presently, Pacific angle sharks first enter the fishery at the same size and age at which they first reproduce., Cited By (since 1996):56, ,
Author: Cailliet, Mollet, Pittenger, Bedford, Natanson
Date: 1992-01-01T00:00:00Z

Title: Bomb radiocarbon and tag-recapture dating of sandbar shark (Carcharhinus plumbeus),
Description: The sandbar shark (Carcharhinus plumbeus) was the cornerstone species of western North Atlantic and Gulf of Mexico large coastal shark fisheries until 2008 when they were allocated to a research-only fishery. Despite decades of fishing on this species, important life history parameters, such as age and growth, have not been well known. Some validated age and growth information exists for sandbar shark, but more comprehensive life history information is needed. The complementary application of bomb radiocarbon and tag-recapture dating was used in this study to determine valid age-estimation criteria and longevity estimates for this species. These two methods indicated that current age interpretations based on counts of growth bands in vertebrae are accurate to 10 or 12 years. Beyond these years, we could not determine with certainty when such an underestimation of age begins; however, bomb radiocarbon and tag-recapture data indicated that large adult sharks were considerably older than the estimates derived from counts of growth bands. Three adult sandbar sharks were 20 to 26 years old based on bomb radiocarbon results and were a 5- to 11-year increase over the previous age estimates for these sharks. In support of these findings, the tag-recapture data provided results that were consistent with bomb radiocarbon dating and further supported a longevity that exceeds 30 years for this species., Cited By (since 1996):3, Fish and Fisheries, CODEN: FSYBA, ,
Author: Andrews, Natanson, Kerr, Burgess, Cailliet
Date: 2011-01-01T00:00:00Z

Title: Life history of Bathyraja trachura from the eastern Bering Sea, with evidence of latitudinal variation in a deep-sea skate species
Description: Although many skates possess life history characteristics that may make them vulnerable to exploitation, the detailed biological information needed to enact effective management schemes is lacking for most species. The objectives of this study were to provide age, growth, and maturity estimates for the roughtail skate, Bathyraja trachura, from the eastern Bering Sea. Maximum age was estimated at 36 yr based on band pair counts in vertebral centra. Of the four growth models applied, the logistic model provided the best description of growth (asymptotic total length = 911 mm; growth coefficient = 0.131 yr-1). There was no evidence of difference in growth between males and females. Females attained maturity at larger sizes and older ages than males. The median size-at-maturity was estimated at 741 mm total length (TL) for males and 796 mm TL for females; median age-at-maturity was estimated at 21.1 yr and 24.7 yr for males and females, respectively. The results of this study may indicate a latitudinal pattern in size and growth, with individuals from the eastern Bering Sea growing more slowly and reaching higher maximum ages than previously reported for specimens collected off the western coast of the continental United States. Copyright © Marine Biological Association of the United Kingdom 2013., Fish and Fisheries, Downloaded from: http://journals.cambridge.org/action/displayFulltext?type=1&fid=9155760&jid=MBI&volumeId=94&issueId=02&aid=9155757 (9 June 2014).
Author: Winton, Natanson, Kneebone, Cailliet, Ebert
Date: 2013-01-01T00:00:00Z

Title: Validated age and growth estimates for the shortfin mako, Isurus oxyrinchus, in the North Atlantic Ocean,
Description: Age and growth estimates for the shortfin mako, Isurus oxyrinchus, derived from vertebral centra of 258 specimens (118 males, 140 females), ranging in size from 64 to 340 cm fork length (FL) were compared with data from 22 tag-recaptured individuals (74-193 cm FL) and length-frequency data from 1822 individuals (1035 males, 787 females; 65-215 cm FL). Annual band-pair deposition, confirmed by a concurrent bomb radiocarbon validation study, was used as the basis for band interpretation. Validation was further confirmed with a tetracycline-injected male shortfin mako recaptured after being at liberty off South Africa for 1 year and aged at 18 years. Growth rates from tag-recapture analysis (GROTAG) were higher than those derived from vertebral annuli and were only available from sharks up to 193 cm FL at recapture. Modal length-frequency data were used to verify the first four age classes. Growth curves were fit using both von Bertalanffy and Gompertz models. The 3-parameter version of the von Bertalanffy growth function produced the most biologically reasonable values for males, based on observed data (L∞ = 253 cm FL, K = 0.125 year-1 (estimated longevity = 21 year), and L 0 = 72 cm). The 3-parameter version of the Gompertz growth function produced the most biologically reasonable estimates, for females (L ∞ = 366 cm FL, K = 0.087 year-1 (estimated longevity = 38 year) and L0 = 88 cm. Males and females were aged to 29 (260 cm FL) and 32 years (335 cm FL), respectively. Both sexes grew similarly to age 11 (207 cm FL, 212 cm FL for males and females, respectively) when the curve leveled in males and continued to rise in females. Age at 50% maturity was estimated at 8 years for males (185 cm FL) and 18 years for females (275 cm FL). The species grows slower, matures later and has a longer life span than previously reported in North Atlantic waters. © 2006 Springer Science+Business Media, Inc., Cited By (since 1996):30, Fish and Fisheries, CODEN: EBFID, ,
Author: Natanson, Kohler, Ardizzone, Cailliet, Wintner, Mollet
Date: 2006-01-01T00:00:00Z

Title: A comparison of age and growth of the Bering skate, Bathyraja interrupta (Gill and Townsend, 1897), from two Alaskan large marine ecosystems,
Description: The Bering skate, Bathyraja interrupta, is commonly found in both the Bering Sea and Gulf of Alaska, where skates are a regular bycatch in commercial long line and bottom trawl fisheries. This is the first study to examine the age and growth of B. interrupta, and one of the few studies to directly compare growth parameters of a skate species between management regions. Ages were estimated based on band counts using the standard gross-sectioning method of vertebral centra preparation. Additionally, a preliminary investigation was conducted into the utility of the histological method. Several growth models were compared and the best-fit model for both regions was identified as the logistic model using the Akaike's Information Criterion approach. No significant difference was detected between sexes for any model in either region; however, a slight but significant difference was found between regions. The parameters of the logistic growth model based on the gross-sectioned preparation were L∞=82.80cm TL and k-1yr=0.23 for the eastern Bering Sea and L∞=86.94cm TL and k-1yr=0.20 for the Gulf of Alaska. Age estimates from the gross sectioned vertebral centra provided a minimum longevity of 19 years and 21 years, respectively. Estimates based on the histologically prepared samples provide overall slightly higher age estimates, but the same maximum age of 21 years. © 2014 Elsevier B.V., , ,
Author: Ainsley, Ebert, Natanson, Cailliet
Date: 2014-01-01T00:00:00Z

Title: Age and growth characteristics of the Starry Skate, Raja stellulata, with a description of life history and habitat trends of the central California, U.S.A., skate assemblage
Description: Skates are prevalent in fisheries worldwide, but rarely are they identified to species. This is of conservation and management concern since skates exhibit a broad range of life history characteristics. The present study investigated the age and growth of the Starry Skate, Raja stellulata, and compared it to other regional skates inhabiting the U.S. West Coast. Age and growth parameters were determined using two vertebral preparation techniques: gross sectioning and histological sectioning. Gross section age estimates ranged from zero to 11 years and growth was described by the two parameter von Bertalanffy growth function (2 VBGF; L ∞ = 915 mm total length (TL) and k = 0.13 year-1; n = 189). Histological section age estimates ranged from zero to 15 years and growth was also described by the 2 VBGF (L ∞ = 1092 mm TL, k = 0.06 year-1; n = 68). Histological section results reflect a more conservative life history, specifically a lower von Bertalanffy growth coefficient, but had slightly biased results and a smaller sample size than the gross section results. An age and depth trend was found within the central California skate assemblage, in which habitat depth and maximum age were positively correlated. © 2013 Springer Science+Business Media Dordrecht., Fish and Fisheries
Author: James, Ebert, Natanson, Cailliet
Date: 2014-01-01T00:00:00Z