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Topics - Hojoman

Pages: 1 [2] 3 4 ... 216
16
CA Regulations / Artificial Habitats for Freshwater Fish
« on: February 22, 2024, 11:21:51 AM »
February 22, 2024

Question: Why does CDFW build artificial fish habitat in California lakes?

Answer: There are several reasons for CDFW to install artificial habitat in reservoirs around the state. Structures can be placed next to spawning areas to provide protective cover for juvenile fish. These constructions also attract larger fish, providing prime fishing opportunities for anglers.

Artificial fish habitat come in all shapes and sizes, whether orange trees, wood structures or other artificial man-made materials. Manzanita shrubs, Juniper trees and even used Christmas trees have been used for habitat purposes. Softwood like avocado trees are avoided because they deteriorate faster in the water.

Biologists might sink as many as 100 structures at different depths in just one reservoir. Crews also place different types of habitat structures along the shoreline when reservoir levels are low, providing a good area for fish habitat once the waters rise. About two dozen reservoirs contain artificial habitat, from Sutherland in San Diego County to Whiskeytown Lake in Shasta County.

One example is the use of large PVC piping in several Southern California lakes. CDFW places circular pipes, 12 inches in diameter and three feet long, in water hoping to attract catfish. Catfish are known as cavity-nesters and once the males have prepared the pipe for spawning by clearing out any debris, females follow and lay their eggs. The males then return to guard the nest and use their fins to fan the eggs to oxygenate them. Biologists will return to the spots where they’ve placed habitat structures to determine their effectiveness.

With two strong rainy seasons in California, many of the state’s reservoirs are filled to historic water levels, which lessens the need to install artificial habitat. Heavy rains raise reservoir water levels which in turn inundates natural habitat along the shoreline. Although this is beneficial for now, our biologists are planning future projects to continue to improve fisheries habitat in times of drought to ensure fish populations stay healthy.

17
CA Regulations / Identifying Duck Species
« on: February 22, 2024, 11:21:29 AM »
February 22, 2024

Question: As a new waterfowl hunter, how do I learn the difference between duck species?

Answer: This is a common question among beginning waterfowl hunters mostly because they don’t want to run afoul of the law, but some hunters with good identification skills also select preferred duck species to harvest, or they may try to harvest primarily males vs. females.

California hosts 39 species or subspecies of waterfowl, so it can be challenging to learn to identify them. Experience is the best teacher and February is a great time in California to learn duck identification by direct observation.

Our recommendation is to visit any of CDFW’s wildlife areas or national wildlife refuges that are managed for waterfowl habitat, or perhaps wherever there is access to hunt waterfowl during the waterfowl season. Visit those places after the close of waterfowl season while the birds are still around. Bring a good pair of binoculars, a waterfowl identification book and maybe a knowledgeable friend who can help. Not only can you help learn to identify the birds from looking at them, but you’ll also begin to learn to distinguish the birds by their flight patterns and sounds they make.

Fun fact, most waterfowl don’t quack, they whistle or chirp in some form or another.

For more information, visit CDFW’s waterfowl program page ( https://wildlife.ca.gov/Conservation/Birds/Waterfowl ). It includes links to resources specific to waterfowl identification.

To find more information on CDFW Lands and their operating hours, please visit the CDFW Lands webpage ( https://wildlife.ca.gov/Lands ). Also be sure visit the Emergency Closures page ( https://wildlife.ca.gov/Closures ) before visiting a CDFW office, facility or property.

18
CA Regulations / Hibernation Adjustments
« on: February 22, 2024, 11:21:08 AM »
February 22, 2024

Question: Do bears adjust their hibernation location when heavy weather conditions arrive?

Answer: Researchers throughout North America have reported that black bears can awaken and travel to new locations when disturbed and the same can be said for black bears that inhabit California. Sows with cubs can move the tiny young into an alternate den if the disturbance is at an unacceptable level or if there is some danger – like a flood or landslide.

Hibernation is an adaptation for some mammals and reptiles, which allows them to survive the winter season. In many areas, winter can be unforgiving. Food is hidden beneath the snow, water sources are frozen over and frigid temperatures can have deadly consequences. By hibernating, an animal’s body temperature, heart rate, breathing and other metabolic activities slow down significantly to conserve energy.

In areas with mild winters, such as in Southern California, most bears do not hibernate, because they have adequate resources and the ambient temperature is survivable. Biologists have found that only pregnant sows (female bears) den up for the entire winter.

Black bears are thought to hibernate for about four months in other parts of California. They can hibernate for many months because their body temperature reduces to approximately 88 degrees Fahrenheit, which is within 12 degrees Fahrenheit of normal. By contrast, the body temperature of smaller animals such as marmots, chipmunks and ground squirrels may drop below 40 degrees Fahrenheit. Small mammals must awaken every few days and raise their body temperatures to normal levels so they can eat stored food, and pass waste. Bears can maintain their suspended state because their warm fur allows them to retain body heat.

19
General Talk / Donor found for Kiet (Bluegill)
« on: February 12, 2024, 08:13:02 PM »
He has been accepted for a double-lung transplant.

20
CA Regulations / Delta Smelt Experiment
« on: February 08, 2024, 01:38:19 PM »
February 8, 2024

Question: What’s the latest on CDFW’s experiment with the Delta smelt population?
Answer: CDFW continues to work alongside several partner agencies to learn more about the decline of Delta smelt and what might be possible to aid in the survival of the endangered species.

The Delta Smelt Experimental Release Study involves releasing 90,000 laboratory-raised fish into the Delta this season to determine which methods prove the most effective at production, tagging, transport and release of the fish into the wild. Learning which plan works best could someday help to supplement the population with a goal of aiding in the recovery of the species.

While being raised in captivity, each fish is marked by hand with an adipose fin clip or a fluorescent tag. A particular color indicates to scientists the date, location and experimental method of the release.

Recently 32 metal 20-gallon containers were filled with 200 Delta smelt and emptied directly into the Sacramento River into a specially designed submerged cage. The cage provided a safe environment while the fish adjusted to the river temperature and their new surroundings before they were fully released a few hours later into the river. Through Delta smelt monitoring surveys that are conducted routinely each year, CDFW can learn about their health and survivability.

“Last year was the first time we were able to uniquely mark fish from different experimental release events and get decent numbers of adult fish recaptured in our monitoring surveys,” said CDFW Environmental Program Manager Dr. James Hobbs. “We’re releasing adult fish just before the spawning season, and we’re hoping these fish will meet up and produce the next generations.”

Unfortunately, the same factors responsible for the near disappearance of the fish are still present including a less than reliable flow of freshwater, low food productivity, loss of wetland habitats, predation by non-native species and other reasons. But scientists say the experiment is showing some positive results with survival and recovery of released adults.

21
CA Regulations / Apprentice Hunts
« on: February 08, 2024, 01:38:01 PM »
February 8, 2024

Question: What program does CDFW have that offers hunting instruction for beginners or young people?

Answer: CDFW has apprentice and special hunts that are designed to involve groups not traditionally experienced with hunting opportunities. The hunts are intended for first time or novice-level hunters, with a strong emphasis on hunter education principles and ethics while developing hunting and shooting skills.

Pen-raised pheasants allow for these hunts to happen in locations featuring easy walking, safe shooting and adequate open space for participants to spread out. These birds present a larger and slower moving target than wild birds, allowing more time to follow direction from their CDFW escort and practice safe shooting skills.

CDFW currently holds about 65 apprentice hunts each year. Junior hunts, women’s hunts, family hunts and mobility impaired hunts all fall under the description of apprentice hunts.

Apprentice hunters must possess a valid California hunting license and upland game bird stamp or validation and participants are selected through a random drawing process.

Further information on apprentice and special hunts are at CDFW Apprentice Hunts at https://nrm.dfg.ca.gov/ApprenticeHunts/Default.aspx

22
CA Regulations / Bighorn Sheep Survey
« on: February 08, 2024, 01:37:45 PM »
February 8, 2024

Question: What does CDFW do with the information gathered at the bighorn sheep survey in Southern California?

Answer: CDFW organizes a survey each year to determine the number of bighorn sheep in the San Gabriel Mountains of Los Angeles and San Bernardino counties.

After receiving specialized training on how to classify the sex and age of bighorn sheep, some 150 volunteers break into small groups that spend most of the day hiking and looking for bighorn sheep.

Volunteer observations help CDFW calculate population estimates that assist the department in monitoring the health and long-term sustainability of this unique population of desert bighorn sheep that occupies high-elevation habitat.

Volunteer assistance is welcome because the areas being surveyed are large, widespread and in some cases very rugged. Volunteers using binoculars or a spotting scope greatly aid CDFW in accomplishing the survey’s goals.

Participants must be at least 16 years of age and be capable of hiking up to five miles in mountain terrain. Volunteers for the March 3, 2024 event can sign up here: Bighorn Sheep Survey Form at https://forms.office.com/pages/responsepage.aspx?id=JTxjS7_vBkCfFQdEK6eqCzwhv8MR4C5FgMYRvs7snbFUNlNHQ1JMNDZUR0lJMVhUSjFTVlpaOUY5RC4u

24
CA Regulations / Salmon Carcasses Donated
« on: January 25, 2024, 05:41:26 PM »
January 24, 2024

Question: When adult (returning) salmon are processed for eggs at hatcheries, what happens with the carcasses?

Answer: CDFW has an agreement to donate Chinook salmon carcasses that are fit for human consumption to the California Emergency Foodlink. That agency then works with food banks throughout California to distribute the salmon that comes from five  northern California hatcheries. Nearly 70,000 pounds of fish from the recent fall-run Chinook salmon migration were donated.

Here’s why salmon are available for those donations. Returning adult fish that swim hatchery gates and up fish ladders are anesthetized before they are spawned. Anesthesia methods used at CDFW hatcheries include carbon dioxide and electro-anesthesia, which keep these fish safe for consumption. CDFW is careful not to waste the carcasses and has been working with California Emergency Foodlink for more than 20 years.

25
CA Regulations / Solo Flight vs Flocks
« on: January 25, 2024, 05:41:08 PM »
January 24, 2024

Question: Why do some species of birds fly in groups of hundreds – or thousands – while some fly or live seemingly single?

Answer: There can be many benefits to living or traveling in groups. Flocks of birds may gather for longer-distance migration or even shorter-distance local movements. Groups of birds also may assemble during the breeding season with many individual birds nesting in a colony. The main advantages of being an individual bird in a flock or nesting colony have to do with safety and finding food resources. Birds within a flock can help alert others to potential predators and other threats. The more eyes there are, the better it is to detect predators. Being in a group can also decrease the chance of any one individual within the flock or colony being taken by a predator. The scientific name for this is called the dilution effect, the more bodies there are the lower the chances of being the individual taken by the predator. Birds in a flock also can improve food-finding and wayfinding for other members within the group. For example, snow geese are a migratory bird that breed in the arctic and overwinter in parts of California and elsewhere in the U.S. and Mexico. The juvenile snow geese hatched that season in the arctic breeding colony have never migrated south. It’s common for juveniles to migrate in family groups with their parents and siblings within the larger flock, which helps juveniles find their way and locate food resources. For bird species that feed on relatively abundant plants or insects, such as waterfowl or small songbirds, it can be beneficial to be in the company of others both for safety and locating food resources.

The primary disadvantage to group living is competition for food and other resources like mates or territory. When a bird must expend a lot of energy to obtain its next meal, such as catching live prey, it can be beneficial to forage alone. For example, many raptors are mostly solitary outside of the breeding season. An individual raptor is in direct competition with its neighbor for limited food resources. Catching live prey, such as small mammals and birds, can require high energy expenditure to obtain. Given the high cost of catching the prey, the raptor benefits most from consuming the prey itself without having to share.

26
CA Regulations / Bears in California
« on: January 25, 2024, 05:40:51 PM »
January 24, 2024

Question: I believe that I may have stumbled upon a grizzly bear in California in June of last year. Is that possible? I live in Siskiyou County, near the Oregon state line.

Answer: In California, the native grizzly bear (Ursus arctos, also known as the brown bear) went extinct around 100 years ago, leaving California with just the one bruin, the black bear that inhabits the entire state. It can be easy to mistake a black bear for a grizzly bear though, due to the tremendous variation in black bear colors and sizes we have in California. Many black bears in California possess a brown coat just like their larger and more aggressive relatives. In addition to brown, California also has many animals that are black, dark brown, cinnamon and even some that are blonde. The size of black bears can also vary widely. While most black bear adults are going to be somewhere between 150 to 300 pounds and easy to distinguish from the much larger grizzly adult, there are many more than 300 pounds and some individuals weighing over a whopping 600 pounds, which is heavier than a lot of grizzlies. Grizzly bears are found today in Alaska, Wyoming, Montana, Idaho, Washington and western Canada. Ear shape, shoulder hump, facial profile and claw length are reliable features used by biologists to distinguish between the two types of bear in areas of species overlap.

California’s black bear population has increased over the years. In the early ‘80s the statewide population was estimated to be between 10,000 and 15,000 bears. The current population is estimated to be between 30,000 and 40,000.

27
CA Regulations / Frog Hibernation
« on: January 11, 2024, 11:32:30 AM »
January 11, 2024

Question: Is it true that frogs hibernate during colder times of the year?

Answer: Black bears aren’t the only wildlife species in California that hibernate in winter months. There are 27 species of native toads and frogs in the state and many hibernate, whether in water or on land. Mountain yellow-legged frogs are a good example. To escape frigid weather, the frogs take shelter in underwater rock crevices and submerged vegetation located in deep pools, which are less likely to freeze over.

Elevation plays a big role in what time of year this happens, with frogs at higher elevations having longer hibernation periods than those at lower elevations. Once the frogs find a perfect location, they can remain there throughout winter. During hibernation, the frogs heart rate and metabolism slow enough that the animals don’t require food.

A common misconception is that hibernating frogs bury themselves in mud at the bottom of a pond or stream. But unlike a hibernating turtle, frogs would suffocate without access to oxygen-rich water.

Terrestrial frogs normally hibernate on land, burrowing deep into the soil and safely below the frost line.

28
CA Regulations / Nonlead Ammunition
« on: January 11, 2024, 11:32:12 AM »
January 11, 2024

Question: I am new to hunting and understand that we need lead-free ammunition to hunt in California. For larger game, are copper-jacketed bullets with lead cores legal under the nontoxic criteria? Or do my bullets need to be 100 percent copper or fully lead-free?

Answer: You’ll need nonlead ammunition for any type of hunting with a firearm in California. No copper-jacketed, lead core bullets are permitted as they contain lead at their core. One hundred percent copper bullets are fine; They are the most common and commercially available nontoxic big game ammunition available, but copper itself is not necessarily required. There are other nontoxic metals and alloys used for bullets, but copper remains the most popular. The best resource to be sure your hunting ammunition is lawful to use in California is found at wildlife.ca.gov/Hunting/Nonlead-Ammunition/Certified.

Specifically, Section 250.1 of Title 14 of the California Code of Regulations requires hunters to use nonlead ammunition in accordance with Fish and Game Code Section 3004.5. These regulations and code sections contain definitions that help explain California’s nonlead ammunition requirements.

29
CA Regulations / Tulare Lake
« on: January 11, 2024, 11:31:53 AM »
January 11, 2024

Question: Is it likely that Tulare Lake will continue to exist year after year, or could it drain off and disappear again?

Answer: When it’s full of water, Tulare Lake in Kings County is practically the size of Lake Tahoe. The major rivers which feed Tulare Lake are dammed and diverted for agricultural and municipal water uses so the lake only fills during exceptional rain years. Tulare Lake made a dramatic reappearance last year after a heavy rainy season, and the lake is likely to remain present in 2024 with rainfall predictions once again being above average.

CDFW is deeply involved in the monitoring of Tulare Lake because of the health implications for the state’s bird populations. As a main landing spot within the Pacific Flyway, millions of waterfowl, shorebirds and other bird species are expected to spend time there. It’s because the water is stagnant and too warm in summer months that avian botulism occurs.

The disease is caused by a toxin-producing bacteria that appears naturally in bodies of water like Tulare Lake. During bacterial growth, the botulinum toxin becomes concentrated in the bodies of invertebrates, such as fly larvae, which are then eaten by waterfowl and other birds, infecting them.

The last large avian botulism outbreak in Tulare Lake happened in 1983 when approximately 30,000 birds, mostly waterfowl, died. The numbers were far more encouraging last year, with fewer than 5,000 deaths. CDFW worked with the US Fish and Wildlife Service, UC Davis School of Veterinary Medicine’s, Oiled Wildlife Care Network and California Waterfowl to quickly collect dead birds to slow the spread of the bacteria and treated more than 1,200 birds releasing nearly 900 healthy birds back into the wild.

30
CA Regulations / Beaver Observation Survey
« on: December 28, 2023, 04:02:12 PM »
December 28, 2023

Question: Is there a way for the public to get involved in CDFW’s beaver restoration program?

Answer: CDFW welcomes information from the public as the department strives to gain a better understanding of the current range of beavers in California. The first comprehensive beaver population survey conducted in California can be found on CDFW's website. The California Beaver Observation Survey includes questions on the date, location, type of activity, and the number and size of the beavers observed. Photos of the beaver activity, location and lodge can be submitted through the survey page as well.

The Beaver Restoration Program is a result of shifting attitudes toward the benefits of beaver families in the environment. There’s a growing recognition of the ecological improvements linked to beaver activity, as opposed to the animal being considered a potential nuisance species by some in the past. CDFW considers these animals ecosystem engineers by playing a role in restoring watersheds while increasing resiliency to climate change and wildfire.

The development of the survey comes after CDFW launched the initial phase of its beaver translocation activities, recently conducting the first beaver conservation release in nearly 75 years with the goal of re-establishing a breeding population.

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