![]() To determine size at first maturity and mating season.The Deep Blue is the largest great white shark ever caught on camera by marine biologists and scientists.ĭeep Blue is 20-foot long (six meters), eight feet high (2.5 meters), and weighs 2.5 tons (2,268 kilograms). To determine size and age of sexual maturity.ģ. To determine age classes of the specimens captured by artisanal fisheries.Ģ. We aim to determine biological aspects of the Elephant Fish through the analysis of specimens captured at a fishing port in central Chile.ġ. Answering these questions will provide knowledge useful in planning and managing these threatened species and also will help scientist in other countries to access to biological data on this species that may be applied for future studies or compared to data already in place. Our scientific questions deal with where they live, what do they eat, when do they mate, when do females lay their eggs, and how do they grow, among others. ![]() Given that the species has been classified as “vulnerable” in the IUCN Red List due to lack of stock assessment, abundance tendency estimations, lack of conservation sites, and life history data, we aim to study different aspects of the biology of this species. Age and reproductive studies allow stock assessment biologists to create models for evaluating elasmobranch population dynamics and to predict the impact of fishing pressure. In recent years, an increasing number of studies have attempted to describe the age and growth of chimaeras, however, very little life history information has been published for any chimaera species in the word. Although some general information on its biology has been reported in several studies, they are not comprehensive or may not be up to date. 2), on sandy bottom where they find their food and lay their eggs. This is a coastal species, mostly captured by gillnets at depths near 40 m (Fig. Landings in Chile during the last decade have fluctuated between 1023 and 221 tons, reaching 609 tons during 2019 (Fig. For instance, the Chilean Elephant Fish, Callorhinchus callorynchus, distributed from southern Ecuador to southern Brazil, has been targeted by several artisanal fisheries along the 4000 km of Chilean coast. However, there are some species of commercial interest. There may be many reasons to explain the scarcity of studies on these fishes they are difficult to identify, most of them inhabit deep waters (more than 1000 m), most of them lack economic value, and given they are not landed, they are not known by the public, which ultimately may rise the interest of scientist and policy makers to elucidate their biology and life-history. They have been in the world’s Ocean for more than 450 million years and as such, they are paramount to understand evolution of living vertebrates. Holocephalans, also known as Chimaeras or Ghost Sharks, constitute a very small group of about 50 valid species. One of the main problems in dealing with elasmobranch fisheries is that their biological and ecological characteristics make them particularly vulnerable to overexploitation. ![]() White Sharks, Whale Sharks, Basking Sharks, and Mantas). As in other groups of animals, most of the attention of scientists and public media has been focused on the so called “charismatic species” (i.e. This group is composed by the elasmobranchs (sharks and rays) and holocephalans (chimaeras). Cartilaginous fishes (Chondrichthyes) are a relatively small group of about 1300 species, distributed widely around the world. ![]()
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