July 2016
01
01

Trouble in Brazil

A few days ago, Ordinance 445/2014 of the Brazilian Ministry of Environment returned (was suspended) and default regulations came into effect which ban the holding of man species of endangered Brazilian killifish.

Any impediment to the collection and breeding of these fish - never seen in the pet trade - restricts out ability to reproduce them in tanks and in many cases given the rate of environmental and habitat destruction, some species now only occur in hobbyists tanks maintained worlde byt amater scentis who have been doingf this for decades/

A the international level, the CITES was made to understand this by Roger Langton at it's inception which is why no Cypronodont is on a CITES list.

Because of the seasonal and ephemeral nature of Cyprinodonts the above legislation acts as a death warrant for critically endangered species.

It would be great if everyone followed this law but that's a fantasy and this legislation will not save the most endangered of fishes and will in actual fact hasten their extinction.

It's hard enough to maintain captive populations of this material and if one day it is hoped a species can be re-introduced into an area where it has become extinct by either lawful or unlawful actions, then an investment needs to me made now in a robust legislative framework that enables that instead of preventing it from ever happening.

http://onlinelibrary.wiley.com/doi/10.1002/jmor.20580/abstract
18

Oogenesis: From Oogonia to Ovulation in the Flagfish, Jordanella floridae Goode and Bean, 1879 (Teleostei: Cyprinodontidae)

Authors Mari Carmen Uribe, Harry J. Grier, Adriana García-Alarcón, Lynne R. Parenti

ABSTRACT

We provide histological details of the development of oocytes in the cyprinodontid flagfish, Jordanella floridae. There are six stages of oogenesis: Oogonial proliferation, chromatin nucleolus, primary growth (previtellogenesis [PG]), secondary growth (vitellogenesis), oocyte maturation and ovulation. The ovarian lamellae are lined by a germinal epithelium composed of epithelial cells and scattered oogonia. During primary growth, the development of cortical alveoli and oil droplets, are initiated simultaneously. During secondary growth, yolk globules coalesce into a fluid mass. The full-grown oocyte contains a large globule of fluid yolk. The germinal vesicle is at the animal pole, and the cortical alveoli and oil droplets are located at the periphery. The disposition of oil droplets at the vegetal pole of the germinal vesicle during late secondary growth stage is a unique characteristic. The follicular cell layer is composed initially of a single layer of squamous cells during early PG which become columnar during early vitellogenesis. During primary and secondary growth stages, filaments develop among the follicular cells and also around the micropyle. The filaments are seen extending from the zona pellucida after ovulation. During ovulation, a space is evident between the oocyte and the zona pellucida. Asynchronous spawning activity is confirmed by the observation that, after ovulation, the ovarian lamellae contain follicles in both primary and secondary growth stages; in contrast, when the seasonal activity of oogenesis and spawning ends, after ovulation, the ovarian lamellae contain only follicles in the primary growth

http://www.biotaxa.org/cl/article/view/12.4.1945/22079
22

Geographical distribution of Austrolebias monstrosus (Huber, 1995), A. elongatus (Steindachner, 1881) and A. vandenbergi (Huber, 1995) (Teleostei: Cyprinodontiformes), with comments on the biogeography and ecology of Rivulidae in Pampasic and Chaco floodplains

Authors: Felipe Alonso1, Pablo Andrés Calviño, Guillermo Enrique Terán, Ignacio García

Abstract: We present a new record for Austrolebias elongatus from Gualeguaychú, in Entre Ríos province, Argentina, based on new fieldwork and a revision of material deposited in national ichthyological collections. We also give evidence on the erroneous records of Austrolebias monstrosus and A. vandenbergi from Ituzaingó, Corrientes province, as well as present additional records from Salta province for those species. Material previously determined as A. elongatus from Santiago del Estero is attributed to A. monstrosus. We restrict the distribution of these two species to Semi-arid Chaco Region in Argentina, Paraguay and Bolivia.








VRx Copyright 2017
VRx Network Services, Inc.