Reproductive Pattern And Growth In Lepidopus Caudatus (Osteichthyes, Trichiuridae) From The Canary Islands (Eastern-Central Atlantic)

 

Víctor M. Tuset, José A. González, J.I. Santana, Aurora Moreno-López & M. Mercedes García-Díaz

 

Instituto Canario de Ciencias Marinas, Departamento de Biología Pesquera, P.O. Box. 56, E-35200 Telde (Las Plamas) Canary Islands, Spain

Corresponding author: Dr. V.M. Tuset, Instituto Canario de Ciencias Marinas, P.O. Box 56, E-35200 Telde (Las Palmas), Spain, Fax: +34-928 132 908

E-mail: victorta@iccm.rcanaria.es

 

Abstract: The silver scabbardfish Lepidopus caudatus (Euphrasen 1788) is a bathypelagic fish living off the Canary Islands. The sexual pattern, reproductive cycle and growth were studied from samples collected from October 1996 and December 1997. The macroscopic observations and the histological analysis of the gonads reveal that this species is a gonochoristic species, showing the ovary a group-synchronous development. A new macroscopic and histological maturity scale of six stages was elaborated according to multiple spawning pattern observed in females. The development of the testis is continuous or unrestricted spermatogonial type being acinar the type of spermatogenesis. Range of length of fish was between 141 and 189 cm FL predominating the females in the catches (89.6% of the total). The length-weight and length-length relationships studied did not point out differences between sexes. Age was determined in whole otoliths ranging from 1 to 7 years in females and between 1 and 5 years in males. The von Bertalanffy growth parameters estimated for females were L= 186.90 cm FL, k= 0.23 year-1 and to= -1.23 years.

 

Key words: Reproduction Pattern, Growth, Lepidopus caudatus, Fishes, Trichiuridae, Canary Islands

 

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