Life history characteristics of a lightly exploited stock of <i>Squalus suckleyi</i>

Tribuzio, Cindy A.; Kruse, Gordon H.

doi:10.1111/j.1095-8649.2012.03241.x

Cited by 17 publications

(17 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reproductive output in deepwater hexanchoid and squalid sharks is generally limited but can be up to 108 pups/litter in the Bluntnose Sixgill Shark Hexanchus griseus (Kyne and Simpfendorfer 2010), a large-bodied (~480 cm TL), mostly deepwater shark that occurs in the northeast Pacific Ocean (Compagno 1984). In contrast, the average fecundity of Pacific Spiny Dogfish in the GOA is about 8.0 ± 4 pups/litter (mean ± SD; Tribuzio and Kruse 2012).…”

Section: Simulations Evaluatedmentioning

confidence: 92%

“…For example, deepwater sharks often exhibit a resting period between parturition and the next ovulation, thus extending the reproductive cycle (Kyne and Simpfendorfer 2010). A biennial reproductive cycle has been observed in Pacific Spiny Dogfish within the GOA (Tribuzio and Kruse 2012). The seasonality of the Pacific Sleeper Shark's reproductive cycle is also unknown.…”

Section: Simulations Evaluatedmentioning

confidence: 99%

“…Consequently, the parameter values we developed for Pacific Sleeper Shark M should be interpreted cautiously because they depended upon both an assumed A max and an independently estimated analytical relationship between M and A max that was obtained from the scientific literature (Hoenig 1983). Because Hoenig (1983) did not include data from shark species (e.g., Tribuzio and Kruse 2012), his method may result in higher estimates of M for sharks relative to other life-history-invariant methods (McAuley et al 2007). Many other empirical relationships (Alverson and Carney 1975;Pauly 1980;Gunderson and Dygert 1988;Lorenzen 1996) and theoretical relationships (Peterson and Wroblewski 1984;Chen and Watanabe 1989;Charnov et al 1993;Jensen 1996) that are commonly used to determine M analytically from life history invariants were not explored here because they require life history data that were not available for Pacific Sleeper Sharks.…”

Section: Simulations Evaluatedmentioning

confidence: 99%

See 2 more Smart Citations

Risk Analysis of Plausible Incidental Exploitation Rates for the Pacific Sleeper Shark, a Data‐Poor Species in the Gulf of Alaska

Courtney

Adkison

Sigler

2016

N American J Fish Manag

View full text Add to dashboard Cite

Monte Carlo simulation was used to investigate the sustainability of incidental exploitation rates (U) for Pacific Sleeper Sharks Somniosus pacificus in the Gulf of Alaska (GOA) under status quo management. Monte Carlo simulations were implemented with a standard, length‐based, age‐structured model that was evaluated with forward projection. Given the paucity of relevant data, we investigated the sensitivity of simulation results to a range of assumptions about key model parameters by using 24 alternative model configurations, each simulated 1,000 times. The risk analysis results were most sensitive to Pacific Sleeper Shark U‐values. The aggregate fraction of simulations ending in an overfished condition increased from 0% under the low‐U scenario to 59% under the high‐U scenario. Risk analysis results were also sensitive to the assumed shape of the length‐based selectivity curve (asymptotic or dome shaped) but were less sensitive to the range of assumptions about other key model parameters, including maximum age and stock productivity. These results indicate that a priority for Pacific Sleeper Shark management is to reduce the uncertainty in U. This major uncertainty will be decreased by an observer program that is now in place to monitor the historically unobserved GOA Pacific Halibut Hippoglossus stenolepis fishery, which incidentally catches Pacific Sleeper Sharks. Received March 19, 2015; accepted December 7, 2015 Published online May 16, 2016

show abstract

Section: Simulations Evaluatedmentioning

confidence: 92%

Section: Simulations Evaluatedmentioning

confidence: 99%

Section: Simulations Evaluatedmentioning

confidence: 99%

See 1 more Smart Citation

Risk Analysis of Plausible Incidental Exploitation Rates for the Pacific Sleeper Shark, a Data‐Poor Species in the Gulf of Alaska

Courtney

Adkison

Sigler

2016

N American J Fish Manag

View full text Add to dashboard Cite

show abstract

“…Positive maternal size-litter size relationships were also recorded for S. megalops in south-eastern Australia (Braccini et al, 2006); for S. cf. mitsukurii from Hawaiian waters (Cotton et al, 2011); for Pacific spiny dogfish Squalus suckleyi (Girard 1855) in the Gulf of Alaska (Tribuzio & Kruse, 2012). Therefore, for species such as S. chloroculus, where fecundity is related to maternal size, larger body size in females is likely be an advantageous characteristic selected for during its evolution (Mejía-Falla et al, 2012).…”

Section: T Ota L L E N G T H T Ota L B O Dy M a S S L I T T E R Smentioning

confidence: 99%

Reproductive biology of the greeneye spurdog Squalus chloroculus (Squaliformes, Squalidae)

Rochowski

Graham

Day

et al. 2015

Journal of Fish Biology

View full text Add to dashboard Cite

The reproduction of the greeneye spurdog Squalus chloroculus was studied based on animals caught in the multispecies and multi-gear southern and eastern scalefish and shark fishery on the upper continental slope off southern Australia. One hundred and ninety-nine females (502-990 mm, total length, L ) and 189 males (515-810 mm L ) were examined. The female reproductive cycle, based on 41 breeding animals, is continuous and triennial, with the pregnancy period estimated to be 31-34 months, seasonal and synchronous with the ovarian cycle; a third of the breeding female population is estimated to give birth between September and December each year. The estimated L at which 50% of females are mature is 799 mm (95% c.i.: 794, 804), whereas the L at which 50% are maternal is 825 mm (95% c.i.: 817-833), but these estimates are probably biased by the phenomenon of apparent change of L at maternity and L at maturity following severe length-selective fishing mortality. Litters ranged from four to 15 embryos with a 1:1 sex ratio, and litter size increased with maternal length. The breeding cycle of males is neither seasonal nor synchronous with the female cycle. The estimated L of males where 50% are mature was 629 mm (95% c.i.: 603, 645).

show abstract

“…Biological and ecological parameters such as growth, reproductive characteristics, food preferences, feeding habits and habitat range are necessary for managing shark stocks. There is surprisingly little information on the SPD in the western North Pacific (Mikawa, 1971;Orlov, Kulish, Mukhametov, & Shubin, 2011;Sato, 1935;Tanabe et al, 1958) compared with those that inhabit the eastern North Pacific, particularly in recent years (Beamish, Thomson, & McFarlane, 1992;Gallucci, McFarlane, & Bargmann, 2009;Jones & Geen, 1977;Saunders & McFarlane, 1993;Tribuzio & Kruse, 2012;Tribuzio, Kruse, & Fujioka, 2010).…”

mentioning

confidence: 99%

Spatial distribution analysis of the North Pacific spiny dogfish, Squalus suckleyi, in the North Pacific using generalized additive models

Yano

Ohshimo

Kanaiwa

et al. 2017

Fisheries Oceanography

View full text Add to dashboard Cite

The North Pacific spiny dogfish (SPD), Squalus suckleyi, is a commercially exploited shark species that plays an important role in the ecosystem. To elucidate the distribution of the SPD in the North Pacific and to evaluate the effects of sea surface temperature (SST) and prey availability on its distribution, we estimated the probability of SPD presence using a generalized additive model with a binomial error distribution from SPD presence/absence data on 14,824 operations in fishery‐independent gillnet surveys between 1972 and 2011. The habitat model was structured in the east and west to reflect differences in the North Pacific oceanic environments. In the east, a higher probability of SPD presence was identified along the coast from the eastern Gulf of Alaska to Queen Charlotte Sound. In the west, it was identified around northern Japan. The estimated distribution was continuous between the two areas, whereas the probability of SPD presence was relatively low. Although the probability of SPD presence was higher at SSTs between 6°C and 12°C, the SST at the peak probability of SPD presence differed between the west and east. The prey species, Japanese sardine, Sardinops melanostictus, and walleye pollock, Gadus chalcogrammus, in the west and boreal clubhook squid, Onychoteuthis borealijaponica, in the east significantly affected the probability of SPD presence, which was higher if the prey species co‐existed with SPD. Therefore, SPD might adapt their distribution to that of available prey species. SPD stock assessment and management in these two important areas are required for its sustainable utilization.

show abstract

Life history characteristics of a lightly exploited stock of Squalus suckleyi

Cited by 17 publications

References 23 publications

Risk Analysis of Plausible Incidental Exploitation Rates for the Pacific Sleeper Shark, a Data‐Poor Species in the Gulf of Alaska

Risk Analysis of Plausible Incidental Exploitation Rates for the Pacific Sleeper Shark, a Data‐Poor Species in the Gulf of Alaska

Reproductive biology of the greeneye spurdog Squalus chloroculus (Squaliformes, Squalidae)

Spatial distribution analysis of the North Pacific spiny dogfish, Squalus suckleyi, in the North Pacific using generalized additive models

Contact Info

Product

Resources

About