SciELO - Scientific Electronic Library Online

 
vol.47 issue4Differential expression of immune response genes in Pacific oyster, Crassostrea gigas spat, fed with dinoflagellates Gymnodinium catenatum and Prorocentrum limaHepatocellular steatosis as a response to nutritional stressors in Lutjanus guttatus (Steindachner, 1869) grown in floating cages: a case study author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Latin american journal of aquatic research

On-line version ISSN 0718-560X

Lat. Am. J. Aquat. Res. vol.47 no.4 Valparaíso Sept. 2019

http://dx.doi.org/10.3856/vol47-issue4-fulltext-13 

Short Communication

New size record of the lollipop shark Cephalurus cephalus caught offshore Bahía Magdalena, Mexico

Mario Jaime-Rivera1 

Roberto Carlos López-Archundia2 

Cesar Augusto Salinas-Zavala3 

1Departamento de Biología Marina, Universidad Autónoma de Baja California Sur La Paz, B.C.S., México

2Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas (CICIMAR) La Paz, B.C.S., México

3Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, B.C.S., México

ABSTRACT

A new size record of the lollipop shark Cephalurus cephalus is described. It is a 367 mm of total length female captured offshore Bahía Magdalena, Mexico. This is a contribution to the knowledge of rare deep-sea Chondrichthyans of demersal habits.

Keywords: Cephalurus cephalus; shark; deep-sea fauna; demersal habits; Mexico

Biology of deep-sea chondrichthyan fishes is poorly known due to its infrequent capture and low or nonexistent commercial value (Ruiz-Campos et al., 2010). One of the less studied deep-sea sharks is the lollipop catshark Cephalurus cephalus (Castro, 2010). It inhabits the eastern tropical Pacific and the Gulf of California at depths of 155 to 927 m (Compagno, 1984). This fish has a body like a tadpole, broadly rounded head with a trunk that narrows to the caudal fin. Its anatomy is in accord with its demersal habits (Compagno, 1984). The lollipop catshark is a placental viviparous fish. Females have two functional ovaries and retain pairs of thin-shelled egg cases until they hatch. Neonates measure about 100 mm of total length (TL); sexual maturation is reached at a length of ~190 mm TL for males and ~240 mm TL for females (Compagno, 1984). The goal of this paper is to update the known maximum size of Cephalurus cephalus (see Compagno, 1984; Castro, 2011).

Sharks were caught incidentally during an exploring hake fishing campaign of the oceanographic vessel BIP XII of the Centro de Investigaciones Biológicas del Noroeste during July 2017. Fishing operation with trawling epibenthic nets lasted 40 min at a depth range of 365 m offshore Bahía Magdalena (Fig. 1).

Figure 1 Location where the lollipop sharks were caught offshore Bahía Magdalena, Mexico (24°4’N, 112°5’W). 

Caught lollipop sharks were kept in ice at −4°C and carried to the laboratory. In order to determine the size structure, the total length of sharks was measured. Sharks were sexed based upon its sexual dimorphism, identifying the presence (length and maturation state) of claspers. A total of 309 sharks were collected; 122 were males and 187 females. Female lengths were 83367 mm TL, with an average of 156 mm TL. Male lengths were 85-245 mm TL with an average of 132 mm TL. A singular large female measured 367 mm and weighted 194 g (Fig. 2). It had immature oocytes in the ovaries, there were no egg cases retained in the oviducts, the uteruses were void with no embryos, and no stomach content was found. Anatomy character measures are shown in Table 1.

Figure 2 Female of lollipop shark Cephalurus cephalus. a) Dorsal view, b) lateral view. 

Table 1 Measures for the female described of Cephalurus cephalus

Character mm % TL
Total length 367 100
Pre-caudal length 250 68.1
Preorbital length 22 6.0
Eye length 15 4.1
Eye height 5 1.4
Prenarial length 15 4.1
Preoral length 20 5.4
Tip of snout to origin of furrow above eye 10 2.7
Length of mouth 34 9.3
Width of mouth 23 6.3
Inter-narial space 10 2.7
Width of nostril 9 2.5
Length of anterior nasal flaps 5 1.4
Inter-orbital space 27 7.4
First dorsal height 17 4.6
First dorsal base 20 5.4
First dorsal length 35 9.5
Superior lobe length 19 5.2
Height of first gill slit 14 3.8
Height of fifth gill slit 10 2.7

Previously reported maximum TL for the species was a specimen from Chile of 320 mm (Compagno, 1984; Castro, 2011). Castro-Aguirre (1981) reported lengths for females and males of 295 and 245 mm TL, respectively. The paratype of the species was a male of 243 mm TL described by Gilbert (Howe & Springer, 1993). Bigelow & Schroeder (1941) examined and described an immature male of 186 mm TL while established the genus Cephalurus for this species. Maximum lengths recorded by scarce registers are shown in Table 2. The lack of embryos and egg cases suggest that the female could undergo a reproductive event. Hatching occurs from summer to winter with no defined breeding season (Balart et al, 2000; Aguirre-Villaseñor & Salas-Singh, 2012).

Table 2 Maximum lengths recorded for Cephalurus cephalus. M: male, F: female, ns: not specified. 

Reported maximum size (mm) Location Depth (m) Reference
186 (M) Gulf of California 662 Bigelow & Schroeder (1941)
243 (M) Islas Revillagigedo 841 Gilbert (1892) cited by Howe & Springer (1993)
243 (F), 257 (M) Gulf of California 464-486 Aguirre-Villasenor & Salas-Singh (2012)
264 (ns) Gulf of California 341-500 Mathews & Ruiz (1974)
295 (F), 245 (M) Western coast of Baja California Sur 112-508 Castro-Aguirre (1981)
295 (F), 298 (M) Western coast of Baja California Sur 230-280 Balart et al. (2000)
320 (F) Chile ns Compagno (1984); Castro (2011)
367 (F), 245 (M) Western coast of Baja California Sur 358-365 This study

A new size record of this cryptic shark that expands knowledge of deep-sea chondrichthyan fishes, and a new record for the species is herein reported. Data concerning the biology of Cephalurus cephalus are deficient (Valenti, 2009). The importance of catching this species as an incidental catch regards in the improvement of the knowledge about its population trend and conservation status.

ACKNOWLEDGMENTS

We wish to thank Fernando Manini for the facilities in the ship. Funding was provided by the Project “Transferencia de paquete tecnológico para la merluza, Merluccius productos en la costa occidental de la Península de Baja California, México” Centro de Investigaciones Biológicas del Noroeste (CIBNOR) and CONACYT.

REFERENCES

Aguirre-Villaseñor, H. & Salas-Singh, C. 2012. New records of the lollipop catshark Cephalurus cephalus (Scyliorhinidae) from the Gulf of California, Mexico. Revista Mexicana de Biodiversidad, 83(1): 298-300. [ Links ]

Balart, E.F., González-García, J. & Villavicencio-Garayzar, C. 2000. Notes on the biology of Cephalurus cephalus and Parmaturus xaniurus (Chondrichthyes: Scyliorhinidae) from the west coast of Baja California Sur, México. Fishery Bulletin, 98: 219-221. [ Links ]

Bigelow, H.B. & Schroeder, W.C. 1941. Cephalurus, a new genus of scyliorhinid shark with redescription of the genotype, Catulus cephalus Gilbert. Copeia, 2: 7376. [ Links ]

Castro, J.I. 2011. The sharks of North America. Oxford University Press, Oxford. [ Links ]

Castro-Aguirre, J.L. 1981. Especies de la familia Scyliorhinidae (Elasmobranchii, Galeoidea), de la costa occidental de México, con especial referencia a Cephalurus cephalus (Gilbert). Anales de la Escuela Nacional de Ciencias Biológicas, México, 24: 71-93. [ Links ]

Compagno, L.J.V. 1984. Sharks of the world: an annotated and illustrated catalogue of shark species known to date. FAO, Rome, pp. 305-306. [ Links ]

Howe, J.C. & Springer, V.G. 1993. Catalog of type specimens of recent fishes in the National Museum of Natural History, Smithsonian Institution, 5: Sharks (Chondrichthyes: Selachii). Smithsonian Contributions to Zoology, 540: 19 pp. [ Links ]

Mathews, C.P. & Ruiz, D. 1974. Cephalurus cephalus, a small shark, taken in the northern Gulf of California, with a description. Copeia, 2: 556-560. [ Links ]

Ruiz-Campos, G., Castro-Aguirre, J.L., Balart, E.F., Campos-Dávila, L. & Vélez-Marín, R. 2010. New specimens and records of chondrichthyan fishes (Vertebrata: Chondrichthyes) off the Mexican Pacific coast. Revista Mexicana de Biodiversidad, 81(2), 363371. [ Links ]

Valenti, S.V. 2009. Cephalurus cephalus. The IUCN Red List of Threatened Species: e.T161455A5428230. [ Links ]

Received: January 09, 2019; Accepted: April 10, 2019

Corresponding author: Mario Jaime-Rivera (carcharodonmaritus@yahoo.com.mx)

Creative Commons License This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.